Skocz do pozycji: 1.

Tytuł:

Computational fluid dynamics methods in turbomachinery

Autorzy:

Chmielniak, T. J.

Powiązania:

https://bibliotekanauki.pl/articles/1953985.pdf

Data publikacji:

1998

Wydawca:

Politechnika Gdańska

Tematy:

computational fluid dynamics CFD
CFD
turbomachinery
numerical methods
modelling
steady flow
unsteady flow
multiphase flow
multicomponent flow
blade cooling

Opis:

This paper aims to present a general view of flow problems in turbomachinery and the current levels of numerical methods for solving these problems. The flow models used for modelling phenomena in blade cascades are presented. Models of turbulence are discussed. A variety of examples of turbomachinery problems, such as steady, unsteady, multiphase and multicomponent flows, and also blade cooling are described. The actual research fields of computational fluid mechanics are presented.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 2; 205-213
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Computational fluid dynamics modelling of short timebottle filling process

Autorzy:

Jałowiecka, Monika
Makowski, Łukasz

Powiązania:

https://bibliotekanauki.pl/articles/185137.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

air entrainment
bottle filling
Computational Fluid Dynamics
multiphase flow
Volume of Fluid method
napowietrzenie
napełnianie butelek
Obliczeniowa dynamika płynów
przepływ wielofazowy
Metoda objętości płynu

Opis:

Every change in the bottle geometry as well as every change of physical and rheological properties posesa risk of excessive gas entrainment during a filling process. To maintain satisfactory filling efficiencythere is a need to optimise this process with respect to all adverse phenomena which affect the fluidflow, such as spluttering on the bottom, air caverns formation and air entrainment with incoming liquid.This paper comprises numerical simulations of two filling methods. The first method involves dosingwith a pipe placed over the free liquid surface of a fully filled bottle. The second method covers fillingwith a pipe located near the bottom. Moreover, the influence of rheological properties and surfacetension values is considered. The comprehensive analysis of amount of entrained air represented byair volume fraction in dispensed liquid let the authors define the influence of filling speed on themechanism and amount of entrapped air.

Źródło:

Chemical and Process Engineering; 2020, 41, 2; 143--163
0208-6425
2300-1925

Pojawia się w:

Chemical and Process Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Computational fluid dynamics simulations of small capacity Kaplan turbines

Autorzy:

Kaniecki, M.
Krzemianowski, Z.
Banaszek, M.

Powiązania:

https://bibliotekanauki.pl/articles/175414.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

hydraulic Kaplan turbine
CFD simulations
determination of operating parameters
cam curve characteristic
hill diagram

Opis:

In the presented paper authors focused on numerical analysis of the flow through selected constructions of Kaplan and semi-Kaplan machines. The paper contains three computation examples; each of them concentrates on different aspects of computational fluid dynamics (CFD) utilization. The numerical tests of various turbulent models for Kaplan turbine CFD applications, numerical determination of the cam curve characteristic and numerical analysis of operating parameters of the semi-Kaplan machine have been presented. The methodology of the implemented numerical computations and final results of calculations have been discussed in each of the presented study cases.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2011, 123; 71-84
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Flow simulation through wankel engine throttle using computational fluid dynamics

Autorzy:

Wendeker, M.
Grabowski, Ł.
Pietrykowski, K.
Magryta, P.

Powiązania:

https://bibliotekanauki.pl/articles/242019.pdf

Data publikacji:

2011

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

flow simulation
CFD
Wankel engine
throttle

Opis:

The paper focuses on the airflow through the throttle in the Wankel engine (Aixro XR50). The author's main challenge was to adapt a Wankel engine for hydrogen injection system, which required a very new full electronic throttle to be installed. Thus, an injector adapter and flow meter were mounted in this engine. The engine will be used as a stationary power unit to generate electricity for small households. Using hydrogen instead of hydrocarbon fuel will reduce the emission of green house gases. The simulation was in the AVL Fire using Computational Fluid Dynamic for 9 different throttle opening angles, i.e. ranging from 20 to 90 centigrade, i.e. 20, 30, 40, 50, 60, 70, 80 and 90 centigrade. The boundary conditions being as the pressure at the inlet and outlet of the throttle module correspond to the real values in the engine. The data on the properties of the flowing medium (air) were selected by default from the AVL Fire library. The authors use the k-zeta-ef model of turbulence to simulate flow through a Wankel engine throttle. The simulation results include the distributions of pressure, velocity and stream lines. The dependence of the mass flow rate as a function of the throttle position angle was presented. The turbulence disappears when the throttle opening angle of 60 centigrade is crossed. For full throttle the velocity at the pipe walls decreases to about 12 m/s. The highest velocity throughout the model occurs just where the throttle is mounted.

Źródło:

Journal of KONES; 2011, 18, 1; 677-682
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Hydraulic analysis of gate valve using computational fluid dynamics (CFD)

Autorzy:

Žic, Elvis
Banko, Patrik
Lešnik, Luka

Powiązania:

https://bibliotekanauki.pl/articles/118702.pdf

Data publikacji:

2020

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

gate valve
hydrodynamic analysis
CFD
Ansys Workbench
software package

Opis:

As a very important element of most water supply systems, valves are exposed to the effects of strong hydrodynamic forces. When exposed to large physical quantities, the valve and piping can be damaged, which could endanger the performance of a water supply system. This is the main reason why it is necessary to foresee and determine the maximum values of velocity, pressure and other physical quantities that can occur in the system under certain conditions. Predicting extreme conditions allows us to correctly size the valve for the expected conditions to which the valve might be exposed, which is also the main objective of this paper. One of the methods for predicting and determining extreme values on a valve is to perform a simulation with computational fluid dynamics (CFD). This is exactly the method used in the preparation of this paper with the aim of gaining insight into the physical magnitudes for models of gate valves positioned inside a pipe under characteristic degrees of valve closure. The Ansys CFX 19.1 and Ansys Fluent 19.1 software was used to simulate the hydrodynamic analysis and obtain the required results. The hydrodynamic analysis was performed for four opening degrees of gate valve

Źródło:

Scientific Review Engineering and Environmental Sciences; 2020, 29, 3; 275-288
1732-9353

Pojawia się w:

Scientific Review Engineering and Environmental Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Computational fluid dynamics analysis of several designs of a Curtis wheel

Autorzy:

Koprowski, Arkadusz
Rządkowski, Romuald

Powiązania:

https://bibliotekanauki.pl/articles/1955026.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

steam turbines
curtis stage
computational fluid dynamics
partial admission

Opis:

In small steam turbines, sometimes the efficiency is not as important as the cost of manufacturing the turbine. The Curtis wheel is a solution allowing to develop a low output turbine of compact size and with a low number of stages. This paper presents three fully dimensional computational fluid dynamics cases of a Curtis stage with full and partial admission. A 1 MW steam turbine with a Curtis stage have been designed. The fully admitted stage reaches a power of over 3 MW. In order to limit its output power to about 1 MW, the partial admission was applied. Five variants of the Curtis stage partial admission were analyzed. Theoretical relations were used to predict the partial admission losses which were compared with a three-dimensional simulations. An analysis of the flow and forces acting on rotor blades was also performed.

Źródło:

Archives of Thermodynamics; 2021, 42, 3; 197-208
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Hydrodynamic performance of psammosteids: New insights from computational fluid dynamics simulations

Autorzy:

Dec, M.

Powiązania:

https://bibliotekanauki.pl/articles/23176.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Opis:

The shape of dermal armor protecting the body in the Paleozoic agnathans such as the Heterostaci has an important hydrodynamic role in providing lift or drag force generation. Here, by performing computational fluid dynamics simulations (CFD), the measurements of hydrodynamic lift/ drag force and lift or drag coefficients were taken for two psammosteids Guerichosteus and Tartuosteus with reference to the pteraspid Errivaspis. This study shows the substantially higher values of the lift coefficient and lift-to-drag ratio for the psammosteids Guerichosteus and Tartuosteus compared with Errivaspis. The tendencies in the evolution of dermal exoskeleton, especially the widening of the branchial plates of psammosteids was directed towards the increased generation of lift force to provide efficient cruising.

Źródło:

Acta Palaeontologica Polonica; 2019, 64, 4
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Computational fluid dynamics analysis of 1 MW steam turbine inlet geometries

Autorzy:

Koprowski, Arkadusz
Rzadkowski, Romuald

Powiązania:

https://bibliotekanauki.pl/articles/1845499.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

CFD analysis
steam turbine
inlet

Opis:

This paper analyses the influence of three different ring-type inlet duct geometries on the performance of a small 1 MW backpressure steam turbine. It examines the efficiency and pressure drop of seven turbine variants, including four spiral inlet geometries and three stages with a mass flow rate around 30 t/h. A one-pipe and two-pipe inlets are analysed from aerodynamical point of view, taking into account stator and rotor blades in three stages without the outlet. An outlet is added to the best variant. Also analysed is the occurrence of vortices in the inlets of the studied variants 1–7 as well as the efficiency, drop pressure, turbine power and mass flow. Finally, the best inlet for a 1 MW steam turbine is suggested.

Źródło:

Archives of Thermodynamics; 2021, 42, 1; 35-55
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Investigation of Grooved Circular Jet Flow Experimentally and Using Computational Fluid Dynamics

Autorzy:

Inan, A.
Sisman, T.

Powiązania:

https://bibliotekanauki.pl/articles/1401305.pdf

Data publikacji:

2015-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

47.27.wg
67.85.-d
66.30.je
68.03.Kn
47.80.Cb

Opis:

This study is the investigation of grooved circular jet flow experimentally and using computational fluid dynamics (CFD). Experimental studies were conducted by using straight circular and grooved circular tubes in a multi-purpose low-range subsonic wind tunnel. Single channel hot wire anemometer was used in turbulence measurements. Numerical studies for the solution of jet flow were performed through FLUENT program (ANSYS 14.5). Jet flow profiles at different velocities were formed by using the data generated at predetermined stations in the experiment room for the straight circular tubes and grooved circular tubes. After transferring the experimental data to Fluent, jet exit points of the circular tubes were placed in the quarter model to coincide with the initial coordinates of experimental room. CFD Calculations were done by implementing different velocities in the experimental room and the jet. Jet flow structures obtained from both computational and experimental calculations are shown in graphs and the data is presented in Tables. The obtained parameters are as follows: axis velocity ($U_\text{e}$), root mean square velocity ($U_\text{rms}$), turbulence velocity ($U_\text{turb}$), jet half width (b) and Reynolds numbers ($Re_{D}$ and $Re_{b}$). These parameters were calculated with reference to jet radius and jet half width. Graphics formed by the generated non-dimensional data were compared to the previous studies.

Źródło:

Acta Physica Polonica A; 2015, 127, 4; 1145-1149
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Assessment of polydisperse substrate flow in a fermentor for computational fluid dynamics modelling

Autorzy:

Wałowski, Grzegorz

Powiązania:

https://bibliotekanauki.pl/articles/2203566.pdf

Data publikacji:

2022

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

adhesive bed
agricultural biogas
autocyclic flow
bioreactor
computational fluid dynamics
CFD
Klinkenberg phenomenon

Opis:

In this paper study results of selected production methods for agricultural biogas are shown and technical and technological aspects of these methods are described for monosubstrate bioreactors. Based on the available literature, modelling of mixing in bioreactors using computational fluid dynamics (CFD) was is demonstrated. As part of the research, the numerical simulation method was used with a tool that contains CFD codes. The model k-ε is used to simulate the mean flow characteristics under turbulent flow conditions. This is a two-equation model that gives a general description of turbulence. The work presents the results of numerical studies that make it possible to understand the characteristics of fluid flow in the adhesive bed used for the production of agricultural biogas. The tests showed that in the core of the adhesive bed there is a flow of 0.19 m∙s-1 , while in the outer part of the bed there is a flow in the range 0.01-0.02 m∙s-1. Taking into account the substrate inflow of 0.17 m∙s-1 (in the upper part of the fermentor), it was observed that the Klinkenberg effect for autocyclic movement (from bottom to top) takes place. The novelty in the article is the observation of the dominant flow in the core of the bed and the autocyclic flow in the opposite direction in the peripheral areas of the adhesive bed.

Źródło:

Journal of Water and Land Development; 2022, Special Issue; 1--7
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Prediction of cavitation inside mini - sac Diesel injector nozzle using computational fluid dynamics

Autorzy:

Bansode, Vaibhav
Verma, Munna
Pandhare, Amar
Shinde, Sandip

Powiązania:

https://bibliotekanauki.pl/articles/2106439.pdf

Data publikacji:

2022

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

cavitations
mini-sac diesel injector nozzle
needle lift
parametric study
CFD
kawitacja
badania parametryczne

Opis:

computational fluid dynamics The performance of the internal flow of the fuel injector is impeded by several factors. The nozzle is one of the factors, being typically about a millimeter long and a fraction of a millimeter in diameter. Cavitation inside the diesel injector nozzle is associated with local pressure distribution. At flow areas with sharp corners, the pressure may locally drop below vapour pressure. The aim of this study is to assess the impact of turbulence and cavitation models on the prediction of flow in diesel injection nozzle. In the present study, an analysis of an existing 6 hole mini-sac diesel injector nozzle is carried out using a CFD package. The main objective of the research is to design a nozzle to avoid cavitation and to find out the contribution of different parameters through parametric study. Cavitation is a complex phenomenon whose appearance depends on the physical as well as flow properties of the flowing substance. Thus, for a better visualization of cavitation, a 3D CFD simulation of mini-sac injector nozzle is carried out. An analysis of a single nozzle hole of a mini-sac diesel injector nozzle is considered for the analysis, as the flow is uniformly distributed through each nozzle. As the three-dimensional geometry of mini-sac nozzle is complicated, therefore tet/hybrid element with T-Grid meshing scheme is used, for good surface meshing. The analysis is carried out at injection pressure of 5 00 bar. The CFDresults are validated against test data with the maximum deviation for the mass flow rate of 8.67% at full needle lift.

Źródło:

Journal of Mechanical and Energy Engineering; 2022, 6, 1; 7--12
2544-0780
2544-1671

Pojawia się w:

Journal of Mechanical and Energy Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Computational fluid dynamics and water quality modeling
Obliczeniowa mechanika płynów a modelowanie jakości wody

Autorzy:

Widomski, M. K.
Kowalska, B.
Musz, A.

Powiązania:

https://bibliotekanauki.pl/articles/127449.pdf

Data publikacji:

2011

Wydawca:

Towarzystwo Chemii i Inżynierii Ekologicznej

Tematy:

water quality
numerical modeling
computational fluid dynamics (CFD)
water supply systems
jakość wody
modelowanie numeryczne
obliczeniowa dynamika płynów
sieci wodociągowe

Opis:

Modeling of water quality in distribution systems becomes nowadays a very popular tool applied in the processes of systems design and operation. Usually, according to everyday practice and literature reports, the chlorine propagation is one of the mostly reported subjects of modeling. Meanwhile, literature presents many examples of pollutants originated in polymer pipes’ material seriously deteriorating the quality of water in distribution systems. In this case, the computational fluid dynamics (CFD) may be applied to numerical calculations of simultaneous transport of several organic and non-organic pollutants in drinking water supply systems constructed of metal or polymer pipes. This paper contains the presentation of recognized pollutants migrating to drinking water from plastic pipes, possibilities of CFD application to water quality modeling and basic set of necessary input data as well as range of simulation results. Advantages and disadvantages of CFD as a tool of water quality numerical assessment were also presented.
Modelowanie parametrów jakości wody w systemach dystrybucji jest obecnie stosowane zarówno w procesie projektowania, jak i w eksploatacji sieci wodociągowych. Najczęściej stosowanym w modelowaniu wskaźnikiem jakości wody w sieci jest rozkład chloru. Badania literaturowe wskazują, iż istnieje duża grupa zanieczyszczeń pogarszających jakość wody, a pochodzących z materiału przewodów. W celu numerycznego określenia transportu tych zanieczyszczeń w sieciach wodociągowych wykonanych z różnych materiałów może być zastosowana obliczeniowa dynamika płynów (CFD). W artykule przedstawiono najczęściej identyfikowane w wodzie zanieczyszczenia pochodzące z materiału przewodów wykonanych z tworzyw sztucznych, możliwości zastosowania CFD do modelowania jakości wody oraz niezbędne w tym celu dane wejściowe. Przedstawiono także wady i zalety CFD jako narzędzia do modelowania zmian jakości wody w sieciach.

Źródło:

Proceedings of ECOpole; 2011, 5, 2; 467-472
1898-617X
2084-4557

Pojawia się w:

Proceedings of ECOpole

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Computational fluid dynamics simulation of heat transfer from densely packed gold nanoparticles to isotropic media

Autorzy:

Radomski, Piotr
Ziółkowski, Paweł
de Sio, Luciano
Mikielewicz, Dariusz

Powiązania:

https://bibliotekanauki.pl/articles/1954995.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

heat transfer
gold nanoparticles
glasses
polymers
computational fluid dynamics

Opis:

This work aims to determine and compare heat generation and propagation of densely packed gold nanoparticles (Au NPs) induced by a resonant laser beam (532 nm) according to the Mie theory. The heat flux propagation is transferred into the materials, which here are: silica glass; soda-lime-silica glass; borosilicate glass; polymethyl methacrylate (PMMA); polycarbonate (PC); and polydimetylosiloxane (PDMS). This analysis aims to select the optimum material serving as a base for using photo-thermoablation. On the other hand, research focused only on Newtonian heat transfer in gold, not on non-Fourier ones, like the Cattaneo approach. As a simulation tool, a computational fluid dynamics code with the second-order upwind algorithm is selected. Results reveal a near-Gaussian and Gaussian temperature distribution profile during the heating and cooling processes, respectively. Dependence between the maximum temperature after irradiation and the glass thermal conductivity is observed confirming the Fourier law. Due to the maximum heating area, the borosilicate or soda-lime glass, which serves as a base, shall represent an excellent candidate for future experiments.

Źródło:

Archives of Thermodynamics; 2021, 42, 3; 87-113
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Computational Fluid Dynamics calculation of a planar solid oxide fuel cell design running on syngas

Autorzy:

Pianko-Oprych, P.
Zinko, T.
Jaworski, Z.

Powiązania:

https://bibliotekanauki.pl/articles/184992.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

planar Solid Oxide Fuel Cells
Computational Fluid Dynamics
syngas
płaskie ogniwa paliwowe z tlenkiem stałym
obliczeniowa dynamika płynów
syngaz

Opis:

The present study deals with modelling and validation of a planar Solid Oxide Fuel Cell (SOFC) design fuelled by gas mixture of partially pre-reformed methane. A 3D model was developed using the ANSYS Fluent Computational Fluid Dynamics (CFD) tool that was supported by an additional Fuel Cell Tools module. The governing equations for momentum, heat, gas species, ion and electron transport were implemented and coupled to kinetics describing the electrochemical and reforming reactions. In the model, the Water Gas Shift reaction in a porous anode layer was included. Electrochemical oxidation of hydrogen and carbon monoxide fuels were both considered. The developed model enabled to predict the distributions of temperature, current density and gas flow in the fuel cell.

Źródło:

Chemical and Process Engineering; 2017, 38, 4; 513-521
0208-6425
2300-1925

Pojawia się w:

Chemical and Process Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Design and computational fluid dynamics analysis of the last stage of innovative gas-steam turbine

Autorzy:

Głuch, Stanisław Jerzy
Ziółkowski, Paweł
Witanowski, Łukasz
Badur, Janusz

Powiązania:

https://bibliotekanauki.pl/articles/1955024.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

axial turbine
blade design
computational fluid dynamics
last stage of low-pressure
twisted blade

Opis:

Research regarding blade design and analysis of flow has been attracting interest for over a century. Meanwhile new concepts and design approaches were created and improved. Advancements in information technologies allowed to introduce computational fluid dynamics and computational flow mechanics. Currently a combination of mentioned methods is used for the design of turbine blades. These methods enabled us to improve flow efficiency and strength of turbine blades. This paper relates to a new type turbine which is in the phase of theoretical analysis, because the working fluid is a mixture of steam and gas generated in a wet combustion chamber. The main aim of this paper is to design and analyze the flow characteristics of the last stage of gas-steam turbine. When creating the spatial model, the atlas of profiles of reaction turbine steps was used. Results of computational fluid dynamics simulations of twisting of the last stage are presented. Blades geometry and the computational mesh are also presented. Velocity vectors, for selected dividing sections that the velocity along the pitch diameter varies greatly. The blade has the shape of its cross-section similar to action type blades near the root and to reaction type blades near the tip. Velocity fields and pressure fields show the flow characteristics of the last stage of gas-steam turbine. The net efficiency of the cycle is equal to 52.61%.

Źródło:

Archives of Thermodynamics; 2021, 42, 3; 255-278
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

A review of the design and control using computational fluid dynamics of gasoline direct injection engines

Autorzy:

Ali, Mohammed Qasim
Mohamad, Barhm

Powiązania:

https://bibliotekanauki.pl/articles/2096202.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN

Tematy:

computational fluid dynamics
engine emissions
optimization
gasoline direct injection
combustion modelling
injector spray pattern
numeryczna mechanika płynów
optymalizacja
bezpośredni wtrysk benzyny

Opis:

This paper explores the role of the computational fluid dynamics (CFD) modeling technique in the design, regulation, and production of the gasoline direct injection (GDI) engine combustion system through literature reviews. It begins with a brief analysis of injector technologies and the effect of spray characteristics on the optimization of the combustion system. The key challenges of optimizing a homogeneous-charge GDI combustion system are the enhancement of volumetric performance and homogeneity of fuel-air mixing with reduced wetting of surface fuel and the improvement of power output. Most of the calculations focused on dynamic mesh strategy to manage moving geometry varied from case to case. The techniques of the methods varied. During the opening event of a GDI gasoline-injector for automotive applications, the findings of the literature indicate the primary fuel atomization.

Źródło:

Diagnostyka; 2022, 23, 3; art. no. 2022306
1641-6414
2449-5220

Pojawia się w:

Diagnostyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Computational fluid dynamics simulation of gas–liquid multiphase flow in T-junction for CO₂ separation

Autorzy:

Wrzesień, Sylwia
Madejski, Paweł
Ziółkowski, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/37215646.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

Computational Fluid Dynamics
CFD
Multiphase Flow
Numerical Simulations
T-junction

Opis:

The article presents the results of a computational fluid dynamics (CFD) analysis of gas-liquid multiphase flow. The simulation was conducted using CFD code and the Euler–Euler approach. The presented study relates to the non–reactive, steady-state, turbulent flow of water and carbon dioxide mixture in a 3D pipe. Separation phenomenon between phases is observed. The solution was obtained using a mixture model. Different values of carbon dioxide volume fraction were taken into account in the analysis of the results. The analysed cases were compared thanks to the obtained calculations results. The main purpose of the simulations was to show streamlines, velocity, pressure, and volume fraction distribution that could be useful in developing pipeline systems in many industrial applications, especially for CO₂ separators.

Źródło:

Zeszyty Energetyczne; 2020, 7; 403-414
2658-0799

Pojawia się w:

Zeszyty Energetyczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

An estimation of conditions inside construction works during a fire with the use of Computational Fluid Dynamics

Autorzy:

Sztarbała, G.

Powiązania:

https://bibliotekanauki.pl/articles/201986.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

computational fluid dynamics (CFD)
fire
buildings
ventilation systems

Opis:

The aim of this paper is to present the application of Computational Fluid Dynamics (CFD) to the assessment of conditions inside construction works during a fire. The CFD method is now commonly used to support the design process of fire safety in construction works. This method is very useful at the preliminary stage of design because it is possible to check the internal environment during a fire and evaluate whether requirements of fire safety are met.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 155-160
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Computational fluid dynamics (CFD) numerical simulation and particle image velocimetry (PIV) measurement of a packed flotation column

Autorzy:

Yan, X.
Chen, Z.
Wang, L.

Powiązania:

https://bibliotekanauki.pl/articles/110183.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

cyclonic-static microbubble flotation column
computational fluid dynamics
sieve-plate packing
particle image velocimetry
velocity distribution

Opis:

Packing is a useful method to obtain a static separation environment for a high flotation recovery and selectivity. In this study, the single-phase flow field in a packed lab-scale cyclonic-static microbubble flotation column (FCSMC) was investigated by computational fluid dynamics (CFD) simulation. Turbulence model was verified by Particle Image Velocimetry (PIV) experiment; the simulation results obtained by the RSM (Reynolds Stress Model) are closer to the experimental data. Based on this validation, RSM turbulence model was used to obtain the effect of sieve-plate on the hydrodynamic characteristics in the column flotation zone. The results show that the sieve-plate packing arrangement greatly straightens the rotation flow and decreases the turbulence. To further improve the effect of packing, two layers of sieve plates were used, and one diameter (1D = 190 mm) was selected as the reasonable distance between the two layers of sieve plates. To quantitative evaluate the effect of sieve-plate packing, the logarithm of Pdk over the logarithm of Pdo was calculated based on the volume-averaged turbulence dissipation rate, increasing from 24.72 for one layer of sieve-plate packing to 216.96 for two layers of sieve-plate packing. The probability of detachment significantly decreased for two layers of sieve-plate packing, and the recovery efficiency was significantly improved.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 2; 395-405
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Computational Fluid Dynamics Modeling of Benzene Propagation in Water Pipe
Obliczeniowa mechanika płynów a modelowanie jakości wody

Autorzy:

Widomski, M. K.
Kowalska, B.
Musz, A.

Powiązania:

https://bibliotekanauki.pl/articles/389060.pdf

Data publikacji:

2013

Wydawca:

Towarzystwo Chemii i Inżynierii Ekologicznej

Tematy:

water quality
numerical modeling
benzene
computational fluid dynamics (CFD)
water supply systems
jakość wody
modelowanie numeryczne
benzen
obliczeniowa dynamika płynów
sieci wodociągowe

Opis:

Modeling of water quality in distribution systems becomes nowadays a very popular tool applied in the processes of systems design and operation. Usually, according to everyday practice and literature reports, the chlorine propagation is one of the most frequently reported subjects of modeling. Meanwhile, literature presents many examples of pollutants originated in polymer pipes’ material seriously deteriorating the quality of water in distribution systems. In this case, the computational fluid dynamics (CFD) may be applied to numerical calculations of simultaneous transport of several organic and non-organic pollutants in drinking water supply systems constructed of metal or polymer pipes. This paper contains the presentation of recognized pollutants migrating to drinking water from plastic pipes, possibilities of CFD application to water quality modeling and basic set of necessary input data as well as range of simulation results. The numerical calculations for dynamic benzene propagation inside the close loop pipe model was performed by Fluent, Ansys. Inc. for the three selected values of velocity flow. Our modeling attempt was performed as the preliminary step in the assessment of dynamic migration of pollutants originated from high-density polyethylene (HDPE) pipe and the input data and initial and boundary conditions were based on the available literature reports.
Modelowanie parametrów jakości wody w systemach dystrybucji jest obecnie stosowane zarówno w procesie projektowania, jak i w eksploatacji sieci wodociągowych. Najczęściej stosowanym w modelowaniu wskaźnikiem jakości wody w sieci jest rozkład chloru. Badania literaturowe wskazują, iż istnieje duża grupa zanieczyszczeń pogarszających jakość wody a pochodzących z materiału przewodów. W celu numerycznego określenia transportu tych zanieczyszczeń w sieciach wodociągowych wykonanych z różnych materiałów może być zastosowana obliczeniowa dynamika płynów (CFD). W artykule przedstawiono najczęściej identyfikowane w wodzie zanieczyszczenia pochodzące z materiału przewodów wykonanych z tworzyw sztucznych, możliwości zastosowania CFD do modelowania jakości wody oraz niezbędne w tym celu dane wejściowe. Zaprezentowano numeryczne obliczenia rozprzestrzeniania się benzenu w wodzie wypełniającej układ zamknięty wykonany z przewodu HDPE. Obliczenia modelowe przeprowadzono za pomocą programu Fluent, Ansys Inc. dla trzech różnych prędkości przepływu przez modelowany przewód. Przedstawione obliczenia zostały wykonane jako wstępna ocena zachodzącej w warunkach dynamicznych migracji zanieczyszczeń organicznych z materiału rur HDPE, w związku z czym dane wejściowe oraz warunki początkowe i brzegowe ustalono na drodze badań literaturowych.

Źródło:

Ecological Chemistry and Engineering. A; 2013, 20, 1; 99-108
1898-6188
2084-4530

Pojawia się w:

Ecological Chemistry and Engineering. A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Assessment of thermal comfort in a lecture hall with the application of instruments for computational fluid dynamics

Autorzy:

Skotnicka-Siepsiak, A.

Powiązania:

https://bibliotekanauki.pl/articles/950453.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

thermal comfort
air division
air conditioning

Opis:

The examinations presented in this article aim at illustrating some possibilities of applying instruments for computational fluid dynamics to assess thermal comfort on the example of a lecture hall in the building of the Institute of Building Engineering at the University of Warmia and Mazury in Olsztyn. The obtained results have been subjected to an analysis according to the guidelines provided in the PN-EN ISO 7730:2006 norm. For the air heating system used in the hall, the distributions of velocity, temperature, as well as the PMV and PDD indices have been subjected to an analysis, with a particular focus on the optimal temperature of the air inflow.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(1); 41-58
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Angular position determination of heart valves in the pediatric ventricular assist device with use of computational fluid dynamics

Autorzy:

Jodko, D.
Obidowski, D.
Reorowicz, P.
Kłosiński, P.
Jóźwik, K.

Powiązania:

https://bibliotekanauki.pl/articles/98935.pdf

Data publikacji:

2014

Wydawca:

Politechnika Śląska. Katedra Biomechatroniki

Tematy:

CFD
pediatric VAD
heart valve
blood stagnation
sztuczna komora serca
zastawka serca
zastój krwi

Opis:

This study shows a method than can be used to determine the best angular position of heart valves installed at the inlet and the outlet of a blood chamber during the diastolic phase with use of Computational Fluid Dynamics (CFD). Steady state simulations of the blood flow through the blood chamber of Pediatric Ventricular Assist Device (PVAD) have been performed with ANSYS CFX 14.0. Main assumptions in the present paper have included: motionless discs, rigid walls, non-Newtonian model of blood. The obtained results show that areas of blood stagnation in the blood chamber are smallest for one particular angular position of the inlet valve and are not significantly dependent on the angular position of the outlet valve.

Źródło:

Aktualne Problemy Biomechaniki; 2014, 8; 57-62
1898-763X

Pojawia się w:

Aktualne Problemy Biomechaniki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Implementation and Analysis of Mathematical Modeled Drive Train System in Type III Wind Turbines Using Computational Fluid Dynamics

Autorzy:

Kabat, Subash Ranjan
Panigrahi, Chinmoy Kumar
Ganthia, Bibhu Prasad
Barik, Subrat Kumar
Nayak, Byamakesh

Powiązania:

https://bibliotekanauki.pl/articles/2022489.pdf

Data publikacji:

2022

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

type III wind turbines
gear train
pitch control
gear ratio
pitch angle
yaw system
angular velocity
CFD

Opis:

This paper is based on designing a modified rotor for a drivetrain in a Type-III wind turbine system for maximum power generation to work effectively under low and high wind speed and its variation. In this paper three drive trains are designed for the gearbox to provide regulated torque and thrust force. For time to time variation in wind speed the voltage sag and during over speed condition voltage swell problem can be solved by using this modified design. The pitch control, gear box and yaw of the wind turbine basically focused for modification. Mainly the gear box for the rotor causes sluggish motion of the rotor during low wind speed. This paper explained the design of modified rotor control for the gear box in DFIG based (Type-III) wind turbine. Also in this paper how the modified rotor system can be helpful for reactive power control highlighted with comparison with existing models. For designing MATLAB Simulink platform is taken and validated using CFD mechanical design analysis. Using these types of modified drive trains maximum power for the wind turbines is enhanced by 40–60% of its reference value.

Źródło:

Advances in Science and Technology. Research Journal; 2022, 16, 1; 180-189
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Computational Fluid Dynamics (CFD) innowacyjne narzędzie do symulowania procesu wędzenia oraz modelowania elementów konstrukcji komory wędzarniczo-parzelniczej
Computational Fluid Dynamics CFD as an innovative tool for stimulating the smoke drying process and for modeling the construction elements of a smoke-drying chamber

Autorzy:

Kubiak, M. S.
Jakubowski, M.
Dolata, W.

Powiązania:

https://bibliotekanauki.pl/articles/93904.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Inżynierii Rolniczej

Tematy:

Computational Fluid Dynamics
CFD
model symulacyjny
komora wędzarnicza
wędzenie
konstrukcja
dysza zasilająca
computational fluid dynamics (CFD)
simulation model
smoking chamber
smoking
power nozzles
construction

Opis:

Omówiono Computational Fluid Dynamics (CFD) w praktyce inżynierskiej jako integralną część postępu w całej inżynierii procesowej wędzenia z uwzględnieniem rozwoju technik i metod przeprowadzania obróbki wędzarniczej. Wykorzystanie narzędzi związanych z modelowaniem CFD pozwoliło na uzyskanie istotnych informacji dotyczących przeprowadzanego procesu wędzenia dla asortymentu o kształcie geometrycznym zbliżonym do szynki (myszka). Komora jednowózkowa stanowiła konstrukcję bazową dla rozwiązań proponowanej modyfikacji elementów zasilających (dysz), jak również geometrię modelu komputerowego samej konstrukcji komory pustej i z wsadem. Dyskretyzacja została wykonana w programie ANSYS Mechanical APDL 12.1 i na jej podstawie stworzono model o proponowanym rozwiązaniu konstrukcji dysz zasilających i rozprowadzających mieszaninę dymu wewnątrz komory wędzarniczej. Na podstawie modeli symulacyjnych i uzyskanych z nich wyników można jednoznacznie stwierdzić, że osiągnięto korzystniejsze warunki rozprowadzenia mieszaniny dymu w komorze wędzarniczej. Przeprowadzone w warunkach rzeczywistych badania z wykorzystaniem zmodyfikowanych dysz zasilających w porównaniu z klasycznym układem potwierdzają zależności uzyskane z symulacji.
This paper elaborates upon the use of Computational Fluid Dynamics (CFD) tools in the engineering practice as an integral part of progress of the chemical engineering of smoke-drying taking into consideration the technical progress and smoke-drying methods. The use of tools connected to CDF modeling allowed collecting crucial information concerning the performed process of smoke-drying for the assortment geometrically shaped similarly to a piece of oval ham. A single truck chamber was a base construction for solutions of the suggested modification of the powering elements (nozzles) as well as for the computer model geometry of the construction of an empty chamber and a full chamber itself. Discretization has been made in the ANSYS Mechanical APDL 12.1 software and on this basis a model of the suggested solution for construction of power nozzles as well as nozzles spreading the smoke substance inside the smoking chamber has been prepared. On the basis of simulating models and received feedback we can unequivocally say, that more advantageous conditions of spreading the smoke substance in the smoking chamber had been found. The tests performed in the real conditions with the use of modified power nozzles in comparison to the classical arrangement confirm dependences obtained during simulation.

Źródło:

Agricultural Engineering; 2014, 18, 1; 73-81
2083-1587

Pojawia się w:

Agricultural Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Three-dimensional computational fluid dynamics modelling of a proton exchange membrane fuel cell with a serpentine micro-channel design

Autorzy:

Zinko, T.
Jaworski, Z.
Pianko-Oprych, P.

Powiązania:

https://bibliotekanauki.pl/articles/185221.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Proton Exchange Membrane Fuel Cells
Computational Fluid Dynamics
flow field design
polarisation curve
obliczeniowa dynamika płynów
pole przepływu
krzywa polaryzacji

Opis:

The aim of this paper was to demonstrate the feasibility of using a Computational Fluid Dynamics tool for the design of a novel Proton Exchange Membrane Fuel Cell and to investigate the performance of serpentine micro-channel flow fields. A three-dimensional steady state model consisting of momentum, heat, species and charge conservation equations in combination with electrochemical equations has been developed. The design of the PEMFC involved electrolyte membrane, anode and cathode catalyst layers, anode and cathode gas diffusion layers, two collectors and serpentine micro-channels of air and fuel. The distributions of mass fraction, temperature, pressure drop and gas flows through the PEMFC were studied. The current density was predicted in a wide scope of voltage. The current density – voltage curve and power characteristic of the analysed PEMFC design were obtained. A validation study showed that the developed model was able to assess the PEMFC performance.

Źródło:

Chemical and Process Engineering; 2018, 39, 2; 143--154
0208-6425
2300-1925

Pojawia się w:

Chemical and Process Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Computational fluid dynamics (CFD) aided design of a multi-rotor flying robot for locating sources of particulate matter pollution

Autorzy:

Suchanek, Grzegorz
Filipek, Roman

Powiązania:

https://bibliotekanauki.pl/articles/38435217.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

computational fluid dynamics
PM pollution
propeller aerodynamics
multi-rotor robot design

Opis:

The use of flying robots for various environmental protection issues is a very important and current research topic. Designing a dedicated multi-rotor flying robot is necessary for the efficient and automated localization of sources of air pollution, especially solid particles. In particular, one of the most important requirements that must be met by such a robot is its appropriate impact on the measurement process, i.e., increasing the sensitivity of sensors or reducing the interference. This is particularly difficult because its rotating rotors introduce significant disturbances to the surrounding fluid. In these studies, the design process is supported by the creation of a mathematical flow model and a series of analyzes to optimize the PM measurement system. The model is built using the finite-volume method in ANSYS Fluent software and steady-state RANS averaging. First, a flow field model with one propeller was modeled and its parameters identified by comparison with the results from the dedicated original dynamometer stand -- characteristics of the propeller performance. On the basis of the simulations and measurement of one rotor, subsequent systems of the highest practical importance are built. The effect of that design process was the preparation and testing of a functional robot prototype. The field parameter distributions resulting from the analyzes, in particular the turbulence intensity, allow one to propose a criterion on the basis of which both the best rotor configuration and localization of sensors are selected.

Źródło:

Applied Computer Science; 2022, 18, 3; 86-104
1895-3735
2353-6977

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Application of 3D flow solver in education of students

Autorzy:

Kosowski, K.

Powiązania:

https://bibliotekanauki.pl/articles/1931592.pdf

Data publikacji:

2002

Wydawca:

Politechnika Gdańska

Tematy:

computational fluid dynamics CFD
CFD
education

Opis:

The development of 3D numerical methods enables the estimation of flow parameters in any section of the channels and in this way the complex phenomenon of generation of losses can be investigated. Application of 3D solver helps in better understanding of flow behaviour in turbine stages, while basing on the results of calculations of stages of different geometries, it is possible to show the effect of different design parameters on the turbine stage output and its efficiency. The paper presents the examples of application of modern computer programs for teaching turbomachinery problems, for research flows in turbine stages and for solving design tasks. Some examples of students' projects are also included.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 4; 621-629
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Optimization of the electric bus radiator design in terms of noise emissions and energy consumption by computational fluid dynamics

Autorzy:

Janicka, Anna
Zawiślak, Maciej
Głogoza, Artur
Włostowski, Radoslaw

Powiązania:

https://bibliotekanauki.pl/articles/2202515.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Naukowe Silników Spalinowych

Tematy:

automotive engineering
electric bus
CFD
noise
ecodesign
inżynieria samochodowa
autobus elektryczny
hałas
ekoprojekt

Opis:

The paper presents the numerical optimization of an innovative radiator for use in electric buses in terms of energy consumption and noise emission. Computational fluid dynamics simulations were performed. The flow of the cooling medium was modeled using the RANS method. The two-equation k-ɛ turbulence model, the heat transfer model and the acoustic model were used. According to the research results, the separation of the air stream in individual fan sections contributes to the improvement of energy efficiency and reduces noise emissions. As a result of the simulation, it was found that the best solution in terms of noise emission as well as the occurring flow phenomena caused about a 2 dB decrease of maximum values of the noise level and allowed the equalization of the cooling medium velocity (prevailing velocity range between 4 and 9 m/s). The results of the simulations were verified under laboratory and field conditions, showing a very good convergence of the model with the results of the experiments (i.e. the maximum noise level was estimated at 57 dB, under measurement conditions for the same operating point at 59 dB) while maintaining the baseline energy demand, which indicates a new approach in the method of shaping internal elements of electric vehicle coolers.

Źródło:

Combustion Engines; 2022, 61, 4; 41--50
2300-9896
2658-1442

Pojawia się w:

Combustion Engines

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Computational Fluid Dynamics and Experimental Studies of a New Mixing Element in a Static Mixer as a Heat Exchanger

Autorzy:

Konopacki, M.
Kordas, M.
Fijałkowski, K.
Rakoczy, R.

Powiązania:

https://bibliotekanauki.pl/articles/185462.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

mixing
heat transfer process
static mixer
CFD
process intensification
mieszanie
proces przenikania ciepła
mieszalnik statyczny
intensyfikacja

Opis:

The main aim of this work is to study the thermal efficiency of a new type of a static mixer and to analyse the flow and temperature patterns and heat transfer efficiency. The measurements were carried out for the static mixer equipped with a new mixing insert. The heat transfer enhancement was determined by measuring the temperature profiles on each side of the heating pipe as well as the temperature field inside the static mixer. All experiments were carried out with varying operating parameters for four liquids: water, glycerol, transformer oil and an aqueous solution of molasses. Numerical CFD simulations were carried out using the two-equation turbulence k-ω model, provided by ANSYS Workbench 14.5 software. The proposed CFD model was validated by comparing the predicted numerical results against experimental thermal database obtained from the investigations. Local and global convective heat transfer coefficients and Nusselt numbers were detrmined. The relationship between heat transfer process and hydrodynamics in the static mixer was also presented. Moreover, a comparison of the thermal performance between the tested static mixer and a conventional empty tube was carried out. The relative enhancement of heat transfer was characterised by the rate of relative heat transfer intensification.

Źródło:

Chemical and Process Engineering; 2015, 36, 1; 59-72
0208-6425
2300-1925

Pojawia się w:

Chemical and Process Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

The application of CFD in the assessment of the patency of the upper respiratory tract

Autorzy:

Marków, Magdalena
Janecki, Daniel
Misiołek, Maciej
Warmuziński, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/1401684.pdf

Data publikacji:

2016

Wydawca:

Index Copernicus International

Tematy:

computational Fluid Dynamics
air flow
larynx

Opis:

Computational Fluid Dynamics is a rapidly developing instrument with a number of practical applications. CFD simulations have been used for years in aerodynamics, engineering, hydraulics, meteorology, construction, and many other fields. In medicine it was used primarily in pulmonology and cardiology, the areas in which the dynamic properties of the gas and liquid play an important role in the proper functioning of the body. In laryngology, Computational Fluid Dynamics (CFD) is a useful method, which allows calculation and visualization of the changing parameters of air flow in the upper respiratory tract.

Źródło:

Polski Przegląd Otorynolaryngologiczny; 2016, 5, 3; 24-27
2084-5308
2300-7338

Pojawia się w:

Polski Przegląd Otorynolaryngologiczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Komputerowe modelowanie dynamiki (CFD) przepływu mieszaniny gazowej przez retortę
Computational Fluid Dynamics (CFD) simulations of fluid flow through retort pipes

Autorzy:

Pianko-Oprych, P.
Skaziak, T.

Powiązania:

https://bibliotekanauki.pl/articles/2071708.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

retorta
przepływ gazu
ocena układu rur wlotowych
CFD
retort
gas flow
evaluation of inlet pipes share

Opis:

Praca prezentuje wykorzystanie symulacji numerycznych do diagnostyki warunków przepływu mieszaniny gazowej przez retortę. Celem badań było osiągnięcie równomiernego rozkładu prędkości gazu przy przepływie przez rury wlotowe retorty. Oceny dokonano w oparciu o współczynnik równomierności rozkładu Mk. Maksymalna wartość współczynnika dla retorty wyniosła 1,07, co stanowi wartość znacznie mniejszą od górnej dopuszczalnej wartości, po przekroczeniu której wymagana jest korekta konstrukcji aparatu.
The paper presents the numerical simulation of hydrodynamics and fluid flow through inlet pipes of vertical retort. The study was aimed at determining regular velocity distributions in retort pipes. The coefficients of uniform velocity distributions, Mk, for retort pipes were estimated from numerical data. A maximum value of uniform velocity distribution coefficient was found to be equal to 1.07. This value is lower than a permissible value and is acceptable for design purposes.

Źródło:

Inżynieria i Aparatura Chemiczna; 2010, 6; 11-13
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Computational fluid dynamics analysis of an innovative start-up method of high temperature fuel cells using dynamic 3d model

Autorzy:

Kupecki, J.
Mich, D.
Motylinski, K.

Powiązania:

https://bibliotekanauki.pl/articles/778455.pdf

Data publikacji:

2017

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

CFD
dynamic modeling
start-up
SOFC

Opis:

The article presents a numerical analysis of an innovative method for starting systems based on high temperature fuel cells. The possibility of preheating the fuel cell stacks from the cold state to the nominal working conditions encounters several limitations related to heat transfer and stability of materials. The lack of rapid and safe startup methods limits the proliferation of MCFCs and SOFCs. For that reason, an innovative method was developed and verified using the numerical analysis presented in the paper. A dynamic 3D model was developed that enables thermo-fluidic investigations and determination of measures for shortening the preheating time of the high temperature fuel cell stacks. The model was implemented in ANSYS Fluent computational fluid dynamic (CFD) software and was used for verifi cation of the proposed start-up method. The SOFC was chosen as a reference fuel cell technology for the study. Results obtained from the study are presented and discussed.

Źródło:

Polish Journal of Chemical Technology; 2017, 19, 1; 67-73
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Computational prediction of the resistance of the the floatplane at various trim angles

Autorzy:

Sulisetyono, Aries
Fadhlurrohman, Ihsan
Ali, Baharudin
Zubaydi, Achmad

Powiązania:

https://bibliotekanauki.pl/articles/2086974.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

resistance
floatplane
trim angle
computational fluid dynamics

Opis:

The prediction of the total resistance occurred during operation of a floatplane on the water surface is an important aspect in developing the floater as well as the engine power required. Theoretically, the trim angle of the floater may affect the total resistance. This paper intends to find the optimal trim angle for the take-off operation using the computational fluid dynamics (CFD) software. The floater set up under a fixed trim angle includes 2◦, 5◦ and 10◦ taken in simulation at five different speeds between 9.21 m/s and 15.87 m/s. In one case of 2◦ trim angle, the floater model test has been carried out in a tow tank laboratory to validate the accuracy of the numerical result. Comparison of both results has a good fit with an average error of 2.27%. In the final simulation results, the optimum trim angle is 5◦, which produces the total resistance less than 2◦ and 10◦ of the trim angle with average differences of 9.21% and 50.46% for all speeds, respectively.

Źródło:

Journal of Theoretical and Applied Mechanics; 2022, 60, 2; 267--278
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Numerical analysis of the steam flow past the turbine blade stage

Autorzy:

Rogowski, K.
Pawlicki, J.

Powiązania:

https://bibliotekanauki.pl/articles/99392.pdf

Data publikacji:

2017

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

computational fluid dynamics
steam turbine
turbulence model

Opis:

The steam flow past a last stage (the eleventh stage) of the high pressure part of the TK120 steam turbine was investigated using computational fluid dynamics (CFD). The simulations are performed using the unsteady compressible Navier-Stokes equations. Viscous steam flow has been analyzed using the Spalart-Allmaras turbulence model. The paper presents distributions of instantaneous flow parameters around turbine blades as well as instantaneous aerodynamic blade loads. Flow parameters such as: velocity and static pressure are presented as contour maps whereas aerodynamic loads, axial and circumferential, are given as functions of time. Theoretical power of the examined turbine stage is 4.11 MW. Based on the numerical investigations the power of the analyzed stage is evaluated to be 3.5 MW. All presented in this paper results have been performed using the ANSYS Fluent solver.

Źródło:

Journal of Machine Engineering; 2017, 17, 2; 102-110
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Hydrodynamic Analysis of Trimaran Vessels

Autorzy:

Javanmardi, M. R.
Jahanbakhsh, E.
Seif, M. S.
Sayyaadi, H.

Powiązania:

https://bibliotekanauki.pl/articles/258654.pdf

Data publikacji:

2008

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

trimaran
resistance
maneuvering
computational fluid dynamics (CFD)

Opis:

Trimaran vessels are developed for different applications and hydrodynamic behavior of such vessels is different than usual mono-hulls. In this paper hydrodynamic resistance and maneuvering of a trimaran with Wigley body form are investigated. The effects of outriggers position in four different longitudinal and two transverse locations are studied. For hydrodynamic simulations a CFD code has been developed and used. This code is capable for simulating three dimensional, time dependent, two phases, viscous flow coupled with rigid body motion. Formulation and solution algorithm are described in detail. Different case studies have been performance and numerical results have shown good agreement with experimental data. Based on resistance and maneuvering simulation of the trimaran vessels different conclusion are made. The results show that positions of outriggers have great effect on resistance and maneuverability of trimaran. The present method can be further employed to investigate other hydrodynamic qualities of trimaran vessels.

Źródło:

Polish Maritime Research; 2008, 1; 11-18
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

A CFD Study of the Aerodynamic Characteristics of Twardowsky and FOK Rockets

Autorzy:

Sahbon, Nezar
Murpani, Siddharth
Michałów, Maciej
Miedziński, Dariusz
Sochacki, Mateusz

Powiązania:

https://bibliotekanauki.pl/articles/36452599.pdf

Data publikacji:

2022

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

computational fluid dynamics
sounding rockets
aerodynamics
modeling

Opis:

Stability and performance are crucial characteristics for aerospace vehicles. The ability to investigate the aerodynamics and performance of rockets gives an insight into their stability before flight and the potential for design and performance enhancements. For the past 13 years, the Rocketry Division within the students’ Space Association of Warsaw University of Technology has been developing sounding rockets of different designs and mission profiles. Two rockets have been chosen for the CFD (Computational Fluid Dynamics) campaigns, FOK and Twardowsky. This paper describes the mathematical model of aerodynamic loads used by the Division for sounding rocket simulation, followed by CFD campaigns for the two rockets. The results of the CFD analysis are then used to calculate the rockets’ aerodynamic derivatives according to a previously defined mathematical model.

Źródło:

Transactions on Aerospace Research; 2022, 1 (266); 35-58
0509-6669
2545-2835

Pojawia się w:

Transactions on Aerospace Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

On general-purpose turbulence models in CFD

Autorzy:

Pozorski, J.

Powiązania:

https://bibliotekanauki.pl/articles/175545.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

computational fluid dynamics
turbulence modeling
Reynolds-averaged approaches

Opis:

The computational fluid dynamics (CFD) tools for various flow problems have become widespread nowadays, yet their use still needs attention and care. In particular, turbulence models are often a crucial part of flow computations undertaken with various software packages, either commercial, open-source or in-house. In the paper, an overview of available model categories is provided, together with some discussion of their advantages or drawbacks with respect to flow cases of interest.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2015, 127; 45-62
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Turbulent flow modelling using EARSM on parallel computers

Autorzy:

Sillen, M.

Powiązania:

https://bibliotekanauki.pl/articles/1955800.pdf

Data publikacji:

2001

Wydawca:

Politechnika Gdańska

Tematy:

aviation
computational fluid dynamics CFD
aerodynamics of airplanes

Opis:

The compressible Navier-Stokes equations are solved numerically for turbulent transonic aerospace applications on parallel computers. The turbulence is modelled by an Explicit Algebraic Reynolds Stress Model (EARSM). Expressing the EARSM as an extension of an eddy-viscosity model makes the implementation straightforward in a flow solver with existing two-equation eddy-viscosity models. The k-w transport equations are used as a platform for the model. The EARSM approach significantly improves the shock position for transonic flow over wings without substantial increase in computational cost. Industrial use of advanced flow modelling requires a short turn-around time of computations. This is enabled through the use of parallel computers. To achieve good parallel performance the computational load has to be evenly distributed between the processors of the parallel machine. A heuristic algorithm is described for distributing and splitting the blocks of a structured multiblock grid for a good static load balance. Speed-up results are presented for turbulent flow around a wing on a number of parallel platforms.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 2; 247-260
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Critical analysis of underground coal gasification models. Part II: Kinetic and computational fluid dynamics models. Literary studies and comparison of models

Autorzy:

Żogała, A.

Powiązania:

https://bibliotekanauki.pl/articles/91950.pdf

Data publikacji:

2014

Wydawca:

Główny Instytut Górnictwa

Tematy:

coal gasification
kinetic models
CFD models
zgazowanie węgla
model kinetyczny
model CFD

Opis:

Purpose Underground coal gasification, as a complex and technically difficult process, in many aspects requires the support provided by computer simulations. There are a lot of mathematical models of UCG, some of them are concentrated with the forecast of syngas composition. The most important may be divided into three groups: equilibrium, kinetic and CFD models. The purpose of this work was the detailed critical analysis of more advanced approaches (than equilibrium considerations) applied in simulations of the coal conversion process – both kinetic and based on computational fluid dynamics. The other aim of this paper was the comparative analysis of the most important models of underground coal gasification. Methods Literary studies, concerned with the features and mathematical description of kinetic and CFD models of coal gasification, were used as the research method applied in the work presented. Compilation of the kinetic parameters of gasification reactions was an important part of this article. For that purpose the analysis of Polish and foreign papers, monographs and university handbooks was undertaken. Results Critical analysis of kinetic and CFD models of coal gasification (together with their mathematical formulation) was the result of considerations presented in this article. Kinetic equations were shown separately for pyrolysis, homogenous and heterogeneous reactions. In the case of CDF models, except for the presentation of the conservation equation, the most important methods of modeling turbulence are described (for the reason that this phenomenon may have significant inflence on the final results). Practical implications The work presented describes practical issues connected with kinetic and CFD models, focusing on their capabilities, drawbacks and possible application problems. Originality/ value This paper presents state of art in the field of coal gasification modeling using kinetic and computational fluid dynamics approach. The paper also presents own comparative analysis (concerned with mathematical formulation, input data and parameters, basic assumptions, obtained results etc.) of the most important models of underground coal gasification.

Źródło:

Journal of Sustainable Mining; 2014, 13, 1; 29-37
2300-1364
2300-3960

Pojawia się w:

Journal of Sustainable Mining

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Numerical simulations of gap flow above rotating disk

Autorzy:

Wasilczuk, F.
Flaszyński, P.
Doerffer, P.

Powiązania:

https://bibliotekanauki.pl/articles/1938643.pdf

Data publikacji:

2015

Wydawca:

Politechnika Gdańska

Tematy:

computational fluid dynamics CFD
internal flow
flow control

Opis:

A rotating disk can be considered a basic configuration for the investigations of the impact of various conditions on the flow through the clearance between the shrouded turbine blade and the casing. Numerical calculations using Fine/Turbo Numeca were conducted to examine the influence of the rotational velocity and the pressure difference across the disk on the flow conditions, especially the mass flow through the clearance. The results were validated using the experimental data. Moreover, the flow field was investigated to reveal the vortices induced in the flow. The calculations showed a significant drop of the mass flow with a rise of the rotation velocity. Additionally, the vortex created upstream of the disk at higher rotation velocities was observed. The phenomenon of separation at the edge of the disk was investigated.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 2; 89-100
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

A complete design of ship propellers using the new computer system

Autorzy:

Koronowicz, T.
Krzemianowski, Z.
Tuszkowska, T.
Szantyr, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/258618.pdf

Data publikacji:

2009

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

ship propellers
design methods
computational fluid dynamics (CFD)

Opis:

The computer system presented in this article is composed of several program blocks for the complete design of ship propellers. The design calculations are based on a combination of the modified lifting line theory and on the vortex lifting surface theory. The system enables solution of the following design problems: - calculation of the scale effect on the ship wake velocity field, including the influence of the propeller and rudder on this field at the propeller location - maximization of the propulsive efficiency - optimization of the propeller blade geometry on the basis of the compromise between the cavitation and blade strength requirements - optimization of the number of propeller blades and blade geometry on the basis of the acceptable level of induced pressure pulses and unsteady shaft bearing forces - calculation of the blade spindle torque for the controllable pitch propellers. The computer system is equipped with many numerical options for graphical visualization of the input data, including an easy possibility of their correction and control of the intermediate and final results of calculations.

Źródło:

Polish Maritime Research; 2009, 1; 29-34
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Numerical model to study the combustion process and emissions in the Wartsila 6L 46 four-stroke marine engine

Autorzy:

Lamas, M. I.
Rodriguez, C. G.

Powiązania:

https://bibliotekanauki.pl/articles/259746.pdf

Data publikacji:

2013

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

marine engine
emissions
combustion
CFD Computational Fluid Dynamics

Opis:

The aim of the present paper is to develop a computational fluid dynamics (CFD) analysis to study the combustion process in a four-stroke marine diesel engine, the Wärtsilä 6L 46. The motivation comes from the importance of emissions from marine engines in the global emissions, particularly for nitrogen oxides (NOx) and sulfur oxides (SOx). The pressure and temperature fields were obtained, as well as the exhaust gas composition. In order to validate this work, the numerical results were satisfactory compared with experimental ones, which indicates that this model is accurate enough to reproduce the fluid pattern inside the cylinder during the combustion process. Accordingly, the aim of future works is to use this numerical procedure to optimize the performance and reduce the emissions of the new marine engine designs.

Źródło:

Polish Maritime Research; 2013, 2; 61-66
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Flow analysis of hydraulic poppet control valve by means of computional fluid dynamics

Autorzy:

Łazowski, J.
Krasucki, J.

Powiązania:

https://bibliotekanauki.pl/articles/248062.pdf

Data publikacji:

2012

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

poppet control valve
computational fluid dynamics (CFD)
flow characteristics

Opis:

The poppet control valve is one of the most widespread hydraulic components. The paper purpose is the evaluation of flow characteristics of poppet valve by means of a complete numerical analysis. The aim of this analysis is to evaluate the valve fluid dynamic performance, exploiting computational fluid dynamics (CFD) techniques, in order to give the reliable indications needed to define the valve design criteria and avoid expensive experimental tests. The numerical analysis was performed by using the commercial code of CFD, and the numerical results show the complete flow field inside the valve. Axisymmetric as well as three-dimensional valve model was considered and the simulation results also are verified with experimental results. The results have confirmed the good accuracy of the simplified CFD analysis based on 2D axisymmetric valve model being more efficient than full 3D approach and show this method as very useful to forecast flow characteristics of poppet control valves. Hydraulic control poppet valve, distribution of the velocity in layers of the fluid, computational grid in the modelled geometry, pressure distribution for axisymmetric and three-dimensional mode for different flow rate, fluid velocity distribution in valve metering section for axisymmetric and three-dimensional model for different flow rates, the example of streamlines, the comparison of flow characteristics are contained in the publication.

Źródło:

Journal of KONES; 2012, 19, 1; 251-259
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Simulation of fluid flow with interacting particles

Autorzy:

Górecki, R.
Mars, M.
Alda, W.
Fioretti, L.
Rybicki, J.

Powiązania:

https://bibliotekanauki.pl/articles/1964083.pdf

Data publikacji:

2001

Wydawca:

Politechnika Gdańska

Tematy:

computational fluid dynamics CFD
particle methods
porous media
sedimentation

Opis:

In the paper a method for modeling flows in the presence of interacting particles is briefly presented. The method is based on merging classical, continuous approach of numerical solution of Navier-Stokes equations on the 2D mesh with discrete particles interacting with the fluid and among themselves by means of central and friction forces. Several sample simulations have been described presenting the flow through porous medium and convection flow driven by sedimentation.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 1; 59-69
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

CFD computation of the savonius rotor

Autorzy:

Rogowski, K.
Maroński, R.

Powiązania:

https://bibliotekanauki.pl/articles/280680.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

vertical axis wind turbine
simulation
computational fluid dynamics (CFD)

Opis:

In this paper, Computational Fluid Dynamics (CFD) analysis of a two-dimensional two- -bucket Savonius rotor, using ANSYS Fluent solver, is presented. Computational methods of fluid dynamics are used to estimate the aerodynamic forces acting on the rotor, the torque and the power extracted by the Savonius rotor. In addition, an analysis of the results for different turbulence models is performed. Numerical investigations are compared with the experiment of the Sandia National Laboratories.

Źródło:

Journal of Theoretical and Applied Mechanics; 2015, 53, 1; 37-45
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Short review of the CFD activities in Poland

Autorzy:

Kazimierski, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1953991.pdf

Data publikacji:

1998

Wydawca:

Politechnika Gdańska

Tematy:

computational fluid dynamics CFD
CFD activities
universities
scientific centres

Opis:

Computational fluid dynamics is being developed at several universities and scientific centres in Poland. These centres are considered and a general description of CFD activities is provided. It should be emphasised that the centres mentioned are only the best known ones. The information provided has been prepared in co-operation with the responsible scientists and is authorised by them. Therefore the form of topics description is not uniform.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 2; 199-204
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Numerical Analysis of Flow Structure in Reciprocating Compressor

Autorzy:

Demircan, Tolga
Yaman, Ali Burak

Powiązania:

https://bibliotekanauki.pl/articles/1165510.pdf

Data publikacji:

2018

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

CFD
Reciprocating compressor
computational fluid dynamics
inlet input angle

Opis:

In line with current rapidly developing technology, mechanization in industry is increasing. In this case, all components that form a machine are becoming important. Compressor plays an important role in operations of numerous machineries. They are used for increasing pressure by compressing gas. Compressors have various types and especially in industries such as automotive, textile, and manufacturing, reciprocating compressors are frequently used. Reciprocating compressors consist of cylinder, piston, and crank and connecting rod mechanism. These components work by narrowing the volume inside the cylinder and increasing gas pressure inside. In this study, flow structure inside a reciprocating compressor was numerically analysed. For this purpose, models were created for 2 different crank angles of a reciprocating compressor. Simulations were made for different pipe angles of inlet pipe and outlet pipe. Valve openings were kept constant at 6 mm. Input and output angles of inlet and outlet pipes to cylinder was changed as 0°, 30°, 45°, 60° and 90°. As a result, it was determined that as the angle of inlet and outlet pipes changed, general flow structure inside the cylinder changed as well. Especially, there were differences in velocity vectors plotted for input and output of the flow from valve to cylinder.

Źródło:

World Scientific News; 2018, 107; 160-170
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

A Temperature Error Correction Method for a Thermometer Screen

Autorzy:

Yang, J.
Liu, Q.

Powiązania:

https://bibliotekanauki.pl/articles/1032598.pdf

Data publikacji:

2017-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

temperature error
surface air temperature
computational fluid dynamics
screen

Opis:

Due to solar radiation exposure, air flowing inside a thermometer screen may produce a measurement error of 0.8°C or higher. To improve the air temperature observation accuracy, a temperature error correction method is proposed. The correction method is based on a computational fluid dynamics method and a genetic algorithm method. The computational fluid dynamics method is implemented to analyze and calculate the temperature errors of a screen under various environmental conditions. Then, a temperature error correction equation is obtained by fitting the computational fluid dynamics results using the genetic algorithm method. To verify the performance of the correction equation the screen and an aspirated temperature measurement platform are characterized in the same environment to conduct the intercomparison. The aspirated temperature measurement platform serves as an air temperature reference. The mean temperature error given by measurements is 0.77°C, and the mean temperature error given by correction equation is 0.79°C. This correction equation allows the temperature error to be reduced by approximately 97.5%.

Źródło:

Acta Physica Polonica A; 2017, 132, 4; 1301-1305
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Numerical investigation of the secondary flow development in turbine cascade

Autorzy:

Doerffer, P.
Rachwalski, J.
Magagnato, F.

Powiązania:

https://bibliotekanauki.pl/articles/1955810.pdf

Data publikacji:

2001

Wydawca:

Politechnika Gdańska

Tematy:

turbines
computational fluid dynamics CFD
secondary flow
wind turbines

Opis:

The results represent the first attempt of the numerical analysis of 3-D secondary flows formed in the linear turbine cascade wind tunnel. Numerical simulations were carried out by means of the SPRC code. It was possible to make presented here calculations thanks to the cluster of PC's providing sufficient computational resources. In order to be able to verify the obtained results the case considered is the workshop test case (D.G.Gregory-Smith 1994 Turbomachinery Workshop Test Case No.3 116). It has been shown that the obtained results are in a very good agreement with experiment. It gave confidence in the results and several important conclusions concerning the development of streamwise vortices could be made thanks to the work carried out.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 2; 165-178
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

An example of the use of computational-fluid-dynamics analysis for simulation of two-phase flow in a cyclone with a tangential inlet

Autorzy:

Wójtowicz, R.
Wolak, P.

Powiązania:

https://bibliotekanauki.pl/articles/207368.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

tangential inlet
CFD
computational fluid dynamics
cyclone
wlot styczny
obliczeniowa mechanika płynów
cyklon

Opis:

The feasibility of using a software package, based on computational fluid dynamics (CFD) codes to simulate two-phase (gas–solid) flows in a cyclone with a tangential inlet was studied. The method-ology of numerical simulations and calculations has been presented and the main parameters influencing the effectiveness of the cyclone elaborated. Findings are presented as contour maps of the distribution of selected flow parameters (velocity, pressure) in some parts of the apparatus or as visualizations of vortex formation structures and particle motion trajectories in the cyclone. The results of simulation were compared with those based on literature correlations and experimental results of laboratory tests.

Źródło:

Environment Protection Engineering; 2016, 42, 3; 109-123
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Numerical analysis of the intake vortex formation in the case of a double fuselage shielded inlet

Autorzy:

Kozakiewicz, A.
Frant, M.

Powiązania:

https://bibliotekanauki.pl/articles/281631.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

turbine jet engine
inlet intake vortex
computational fluid Dynamics

Opis:

The paper raises a very important problem, concerning the work of turbine-jet engines, that is the intake vortex. A phenomenon which is relevant to all engines of this type. The article demonstrates literature data determining the influence of the airflow direction and zone on the possibility of vortex formation, taking into consideration the influence of basic geometrical data. The outcomes of calculations related to the formation of the inlet vortex for a given fuselage shielded inlet constructional system are shown. The studies are concerned with determination of the influence of angles and the gust speed value on forming of the vortex in this kind of intake.

Źródło:

Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 757-766
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Steady and unsteady analysis of NACA 0018 airfoil in vertical-axis wind turbine

Autorzy:

Rogowski, K.
Hansen, M. O. L.
Maroński, R.

Powiązania:

https://bibliotekanauki.pl/articles/279244.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

airfoil characteristics
vertical-axis wind turbine
computational fluid dynamics

Opis:

Numerical results are presented for aerodynamic unsteady and steady airfoil characteristics of the NACA 0018 airfoil of a two-dimensional vertical-axis wind turbine. A geometrical model of the Darrieus-type wind turbine and the rotor operating parameters used for numerical simulation are taken from the literature. Airfoil characteristics are investigated using the same mesh distribution around the airfoil edges and two turbulence models: the RNG k-ε and the SST Transition. Computed results for the SST Transition model are in good agreement with the experiment, especially for static airfoil characteristics.

Źródło:

Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 203-212
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Computational Fluid Dynamics Modeling of Residence Time Distribution in a Field-Scale Horizontal Subsurface Flow Constructed Wetland with Palm Kernel Shell as Substrate

Autorzy:

Okoye, Nelson Mbanefo
Madubuike, Chimaobi Nnaemeka
Nwuba, Ifeanyi Uba
Orakwe, Louis Chukwuemeka
Ugwuishiwu, O. Boniface

Powiązania:

https://bibliotekanauki.pl/articles/1163287.pdf

Data publikacji:

2018

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

COMSOL
Computational Fluid Dynamics
Constructed Wetland
Simulation Modelling
Wastewater Treatment

Opis:

The hydraulic performance of constructed wetlands is often compromised by hydraulic problems. Therefore, the development of an appropriate simulation model to reliably predict how various modifications of bed design and configurations might affect performance will facilitate the design of efficient systems. The aim of this research work is to determine distribution of residence time in a field-scale horizontal subsurface flow constructed wetland with Palm Kernel Shell as substrate. The governing equations of flow in porous media and transport of diluted species were solved using COMSOL Multiphysics 5.3a. The result was validated using experimental data and the model result showed good agreement with a correlation coefficient of 0.99. Alternative wetland designs were assessed for the same flow conditions. The results revealed that a two cell wetland improved short-circuiting flow paths.

Źródło:

World Scientific News; 2018, 109; 60-70
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Numerical model to study the valve overlap period in the Wärtsilä 6L 46 four-stroke marine engine

Autorzy:

Lamas, M. I.
Rodríguez, C. G.
Rebollido, J. M.

Powiązania:

https://bibliotekanauki.pl/articles/259055.pdf

Data publikacji:

2012

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

four-stroke engine
computational fluid dynamics (CFD)
marine engine

Opis:

In this paper, a CFD (Computational Fluid Dynamics) analysis was carried out to study the Wärtsilä 6L 46 medium-speed, four-stroke marine engine. For the purpose, the commercial software ANSYS Fluent 6.3 was employed. The aim is to analyze the scavenging of gases, especially during the valve overlap period. Particularly, the pressure, velocity and mass fraction fields were numerically obtained. In order to validate the CFD results, the in-cylinder pressure was successfully compared to experimental measurements for the exhaust, intake and compression strokes of the cylinder operation. This model can be used in future works to improve the performance of these engines because the information provided is very useful to identify regions in which the pressure, velocity or distribution of gases are inadequate. Besides, to compute the quantity of burnt gases which remain inside the cylinder, fresh charge which is expelled through the exhaust valves and study the influence of parameters such as the exhaust and intake pressures, engine speed, cam profile design, etc.

Źródło:

Polish Maritime Research; 2012, 1; 31-37
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Experimental study and numerical simulation of the water entry of a ship-like symmetry section with an obvious bulbous bow

Autorzy:

Wang, Qiang
Yu, Pengyao
Zhang, Boran
Li, Guangzhao

Powiązania:

https://bibliotekanauki.pl/articles/1955603.pdf

Data publikacji:

2021

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

water entry
bow-flare sections
slamming
Computational Fluid Dynamics

Opis:

A bulbous bow is a typical ship structure. Due to the influence of the bulbous bow, complex flow separation and gas capture phenomena may appear during the water entry of ship-like sections. In this paper, experimental and numerical studies on the water entry of a ship-like section with an obvious bulbous bow are carried out. Two thin plates are installed at both ends of the test model to ensure that the flow field during the impact process is approximately twodimensional. The free-fall drop test is carried out in the test rig equipped with guide rails. By changing drop heights, impact pressure on the model surface with different initial impact velocities is measured. A numerical model for simulating the water entry of the ship-like section is established by using the Computational Fluid Dynamics (CFD) method, based on the Navier-Stokes equations. Reasonable time steps and mesh size are determined by convergence analysis. Four different flow models are used in the numerical analysis. It is found that the K-Epsilon turbulence model can present the most reasonable numerical prediction by comparing numerical results with the experimental data. Furthermore, the influence of the bulbous bow on the impact loads is numerically studied by using the validated numerical model. It suggests that the bulbous bow has little effect on the impact force acting on the bow-flared area but, in the position near the bulbous bow, the pressure will be affected by the second slamming and the air cushion.

Źródło:

Polish Maritime Research; 2021, 3; 16-34
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

The Gas dynamics of the exhaust diffusers: computational aspects

Autorzy:

Solodov, V. G.

Powiązania:

https://bibliotekanauki.pl/articles/1967649.pdf

Data publikacji:

2001

Wydawca:

Politechnika Gdańska

Tematy:

gas dynamics
diffusers
exhaust devices
CFD
computational fluid dynamics CFD

Opis:

Some recent advances in computational gas dynamics of exhaust diffusers are presented. The compressor/turbine axial-radial exhaust diffusers and outlet devices of compressor/turbine units, exhaust hoods for power steam turbines are considered. The peculiarities of gas dynamics of the above mentioned devices are discussed. The formulations of problems for CFD analysis of these devices are discussed including the coupling procedure for joint operation of the last stage and exhaust hood. The numerical method and the implementation of a differential turbulence model are described. The new approach to the description of computational domain and parallel numerical solution of transport equations based on the unstructured set of structured grid blocks is also presented.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 495-517
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

CFD analysis of the influence of flaps extension on the aerodynamic characteristics of the M-28 Bryza aircraft

Autorzy:

Szczepaniak, R.
Konopka, B.
Zahorski, T.
Bąbel, R.
Stryczniewicz, W.

Powiązania:

https://bibliotekanauki.pl/articles/243831.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

M-28 Bryza
aerodynamic characteristics
flap
Computational Fluid Dynamics

Opis:

The paper presents a modelling procedure of the M-28 Bryza wing with extended flaps and Computational Fluid Dynamics (CFD) simulations results preformed in order to assess the performance of the investigated wing for various flap extension rates. The M-28 Bryza is a two-engine high-wing aircraft used in the Polish Air Force for short distance airlift of people and equipment. The aim of this work was to determine the aerodynamic characteristics of the investigated wing. The CFD simulations were performed in order to investigate the influence of flap extension on lift and drag coefficients at various angles of attack. In order to validate the results of two different commercial CFD packages were used. The findings are presented in the form of flow visualization and aerodynamic characteristics. The typical and non-standard extension rates were investigated for low, moderate and high angles of attack. The results correlated with the limitations specified in the aircraft manual. The outcome of the presented work confirmed the feasibility of the presented methodology for its use as a supportive tool for providing additional information about airplane performance in standard and non-standard conditions of flight such as landing with one engine working. The results of work might prove useful for M-28 Bryza pilots and maintenance personnel as well as for educational purposes.

Źródło:

Journal of KONES; 2016, 23, 1; 353-360
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Computational fluid dynamics (CFD) simulation of liquid-liquid mixing in mixer settler
Zastosowanie obliczeniowej mechaniki płynów do symulacji mieszania ciecz-ciecz w ekstraktorze

Autorzy:

Shabani, M. O.
Mazahery, A.

Powiązania:

https://bibliotekanauki.pl/articles/354518.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

ekstraktor
CFD
mieszanie
mixer settler
mixing

Opis:

Mixer-settlers are widely used inmetallurgical, mineral and chemical process. One of the greatest challenges in the area of hydrometallurgy process simulation is agitation made by impeller inside mixer-settler which yet presents one of the most common operations. Computational fluid dynamics (CFD) model has been developed to predict the effect of different physical parameters including temperature and density on the mixing characteristics of the system. It is noted that non-isotropic nature of flow in a mixer-settler, the complex geometry of rotating impellers and the large disparity in geometric scales present are some of the factors which contribute to the simulation difficulty. The experimental data for different velocity outlet was also used in order to validate the model.
Mieszanie w ekstraktorze (mieszalniku-odstojniku) jest jedną z najczęstszych operacji, ale stanowi jedno z największych wyzwań dla symulacji komputerowej. Ekstraktory zazwyczaj zawierają wirnik zamontowany na wale, i ewentualnie mogą zawierać przegrody. W niniejszej pracy badano właściwości hydrodynamiczne ekstraktorów. Zbadano wpływ różnych parametrów fizycznych, temperatur i gęstości, na mieszanie w układzie. Model oparty na obliczeniowej mechanice płynów (Computational Fluid Dynamics) zostałopracowany w celu przewidywania charakterystyki mieszania. Model zostałzweryfikowany za pomocą danych doświadczalnych dla różnych szybkości stosowanych w pracy. Praca pozwoliła na zwiększenie efektywności ekstraktorów, które mogą charakteryzować się wyższymi parametrami niż te podawane w literaturze.

Źródło:

Archives of Metallurgy and Materials; 2012, 57, 1; 173-178
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Jet and droplet breakup modelling approaches

Autorzy:

Kapusta, Ł. J.
Jaworski, P.
Kowalski, J.

Powiązania:

https://bibliotekanauki.pl/articles/245813.pdf

Data publikacji:

2015

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

spray
modelling
simulation
breakup
injection
CFD
computational fluid dynamics (CFD)

Opis:

Three-dimensional computational fluid dynamics (CFD) plays important role in engines development. The mixture formation in a direct-injection piston engines poses a huge challenge in successful simulations of the engine processes. It is due to the fact that the spray as a two-phase flow complicates the computational process. Moreover, this multiphase flow is not uniform. Three main zones, depending on the distance from the nozzle exit are visible when a liquid is injected. Very dense so called “thick” in a direct vicinity of the injector hole, than “thin” as a result of pri-mary breakup downstream the injector and finally in the certain distance from the injector appears “very thin” region as a result of secondary breakup. It is important to take into account that the liquid phase in various regimes behaves differently and is under influence of different phenomena. The modelling approach needs to take in to consideration all those elements. This paper focuses on presentation of the theory and numerical models for primary and secondary breakup phenomena. The primary breakup is a process that results from a combination of three mechanisms: turbu-lence within liquid phase, implosion of cavitation’s bubbles and aerodynamic forces acting on a liquid jet. Secondary breakup regime occurs mainly due to the aerodynamic interactions between the liquid and the gaseous phase.

Źródło:

Journal of KONES; 2015, 22, 3; 83-90
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Wind turbine operation parameter characteristics at a given wind speed

Autorzy:

Kamiński, Z.
Czyż, Z.
Wendeker, M.

Powiązania:

https://bibliotekanauki.pl/articles/103129.pdf

Data publikacji:

2014

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

wind turbine
renewable energy
computational fluid dynamics (CFD)
numerical analysis

Opis:

This paper discusses the results of the CFD simulation of the flow around Vertical Axis Wind Turbine rotor. The examined rotor was designed following patent application no. 402214. The turbine operation is characterised by parameters, such as opening angle of blades, power, torque, rotational velocity at a given wind velocity. Those parameters have an impact on the performance of entire assembly. The distribution of forces acting on the working surfaces in the turbine can change, depending on the angle of rotor rotation. Moreover, the resultant force derived from the force acting on the oncoming and leaving blades should be as high as possible. Accordingly, those parameters were individually simulated over time for each blade in three complete rotations. The attempts to improve the performance of the entire system resulted in a new research trend to improve the performance of working turbine rotor blades.

Źródło:

Advances in Science and Technology. Research Journal; 2014, 8, 22; 75-82
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Fishing vessel hull design and towing resistance calculation by the CFD methods

Autorzy:

Sugalski, K.

Powiązania:

https://bibliotekanauki.pl/articles/360672.pdf

Data publikacji:

2014

Wydawca:

Akademia Morska w Szczecinie. Wydawnictwo AMSz

Tematy:

fishing vessel
stern trawler
resistance calculation
computational fluid dynamics (CFD)

Opis:

Hull resistance and propulsion calculations are the basis of every ship design. In this paper, application of the computational fluid dynamics are presented together with the results of towing resistance of the model of stern trawler. The practical use of CFD in the preliminary vessels' design process were presented at the stern trawler vessel type.All calculations had been performed in the free CFD software called OpenFOAM. This is set of C++ programming language libraries, designed to solve Navier-Stokes equations.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 40 (112); 27-30
1733-8670
2392-0378

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Szczecinie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Design of the natural ventilation system for the fishing vessel by the CFD methods

Autorzy:

Sugalski, K.

Powiązania:

https://bibliotekanauki.pl/articles/358991.pdf

Data publikacji:

2014

Wydawca:

Akademia Morska w Szczecinie. Wydawnictwo AMSz

Tematy:

fishing vessel
stern trawler
aerodynamics
ventilation
computational fluid dynamics (CFD)

Opis:

In this paper, application of the computational fluid dynamics has been presented in the process of design natural ventilation system for the fishing vessel. There are two main types of ventilation systems: natural ventilation which is used on small fishing vessels and sport craft boatsand, and forced ventilation. This type of ventilation is a common solution on all types of merchant ships. In this paper, solution of the velocity filed in the cargo hold space of the fishing vessel had been presented. Natural ventilation system has been validated using the CFD (Computational Fluid Dynamics). All calculations had been performed in the free CFD software called OpenFOAM.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 40 (112); 23-26
1733-8670
2392-0378

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Szczecinie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Numerical analysis of influence of selected elements on effectiveness of streamline rudder

Autorzy:

Abramowski, T.
Szelangiewicz, T.

Powiązania:

https://bibliotekanauki.pl/articles/258696.pdf

Data publikacji:

2010

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

streamline rudder
improvement of rudder effectiveness
computational fluid dynamics (CFD)

Opis:

During designing steering gear for large fast transport ships (e.g. container carriers), shipowners usually put forward strong demands concerning ship manoeuvrability. It means that streamline rudders should be characterized by a high effectiveness, i.e. fast increasing values of lifting force in function of rudder angle and large values of lifting force related to rudder area. As gabarites of streamline rudder depend on a form and draught of stern part of ship’s hull, an improvement of rudder effectiveness can be reached by an appropriate selection of rudder profile and application of additional elements to rudder blade. This paper presents results of numerical investigations (by using CFD methods) of hydrodynamic forces acting on rudder blades of the same gabarites but based on different profiles. Such calculations were also performed for selected rudder blades fitted with additional elements intended for the improving of rudder effectiveness.

Źródło:

Polish Maritime Research; 2010, 3; 3-7
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

A complete design of ducted propellers using the new computer system

Autorzy:

Koronowicz, T.
Krzemianowski, Z.
Tuszkowska, T.
Szantyr, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/258682.pdf

Data publikacji:

2009

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

ship propellers
ducted propellers
design methods
computational fluid dynamics (CFD)

Opis:

The computer system for the completed design of the ducted ship propellers has some common blocks and procedures with the analogical system for open propellers that has already been presented in detail in the Polish Maritime Research [1]. This article describes only these blocks and procedures which are specific for the design of ducted propellers. These new blocks concern first of all the procedures for the design calculation of ducted propellers and for the analysis of the ducted propeller operation in the non-uniform velocity field behind the ship hull. The comparative analysis of computation results for different types of ducts is also presented.

Źródło:

Polish Maritime Research; 2009, 2; 34-39
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Application of the rans flow model for the analysis of the motion of floating objects in waves

Autorzy:

Kraskowski, M.

Powiązania:

https://bibliotekanauki.pl/articles/248052.pdf

Data publikacji:

2012

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

computational fluid dynamics (CFD)
ship
drilling platform
mooring
model tests

Opis:

The present paper describes a proposal of the method for simulating the motion of freely floating and moored objects in waves, based on the RANS (Reynolds Averaged Navier-Stokes Equations) flow model. Attempts on using this model for simulating the floating body dynamic started quite recently due to its large requirements for the computer power. Only in the past few years such analyses became more common, however, no unique approach can be observed due to large variety of existing possibilities, numerical methods etc. The paper includes the description of the proposed method, which consists in mesh generation technique, efficient wave generation method, and the mooring system module, as well as two samples of marine applications: analyses of the motion of fishing vessel in head waves and the motion of moored semi-submersible drilling platform. The results were verified basing on the towing tank experiments, conducted by Centrum Techniki Okrętowej (Ship Design and Research Centre) S.A. Generating the waves by prescribed wave motion on both ends of the domain, generating the waves by prescribed wave motion and suppressing them in the damping zone, sliding mesh example, mooring system scheme, forcedisplacement characteristics of the mooring chain, fishing vessel in head waves, heave motion history, outline of the semi-submersible are presented.

Źródło:

Journal of KONES; 2012, 19, 1; 199-206
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Numerical simulation of 3D viscous turbomachinery flow with high-resolution ENO scheme and modern turbulence model

Autorzy:

Yershov, S. V.
Rusanov, A. V.

Powiązania:

https://bibliotekanauki.pl/articles/1967653.pdf

Data publikacji:

2001

Wydawca:

Politechnika Gdańska

Tematy:

CFD
computational fluid dynamics CFD
turbomachinery
Navier-Stokes equation
turbulence

Opis:

This paper presents the basic principles of construction of numerical models for 3D viscous turbulent flows through multi stage turbomachines. The great attention is given to such properties of the methods as accuracy, linear and non-linear stability, robustness and computational efficiency. It is shown that these properties can be guaranteed if the implicit Godunov’s type ENO scheme is used. A 3D code FLOWER has been developed within this concept. Using the code the numerical results are obtained for flows through high loaded compressor cascades, a turbine stage, a low-pressure multi stage turbine and a centrifugal compressor stage. The results of optimisation of a low-pressure turbine last stage are presented.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 459-476
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Study on the effect of the descent rate of a helicopter in the Vortex Ring conditions

Autorzy:

Surmacz, K.
Kowaleczko, G.

Powiązania:

https://bibliotekanauki.pl/articles/248016.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

Vortex Ring State
helicopter descent
computational fluid dynamics
flow simulations

Opis:

One of the limiting factors for a helicopter operation is the Vortex Ring State (VRS). This aerodynamic phenomenon, known as the VRS or “Settling with Power”, is characterized by the formation of circulating air stream moving along a ring shaped track around the main rotor of a helicopter. Conditions, conducive to development of the vortex ring state, occur in the vertical or nearly vertical descent. This leads to decrease in thrust and thus rapidly increasing the rate of descent. This phenomenon occurs for an appropriate combination of induced velocity and the velocity of the stream of airflow from the bottom to the rotor. The rates of change of velocities delimit dangerous areas of flight. The objective of this work was to investigate the influence of the descent rate of a helicopter on the vortex ring formation process and determinants of the occurrence of vortex rings. For better understanding of the nature of this state, a computational method was applied. Series of three-dimensional (3D) unsteady analysis was carried out using Computational Fluid Dynamics tools (CFD). Simulations were realized using geometry and performance of the W-3 “Sokol” helicopter. The paper presents results of a helicopter operation in axial and non-axial descent conditions. Three calculation cases of vertical flight of a helicopter with different rates of velocity changes were considered. A simulation of non-axial descent was based on the measured flight test data for the W-3 helicopter. The results provide information about the changing nature of the flow in the course of the movement of a helicopter and show the influence of the rate of descent during initiation on the development of VRS. Results of the calculations provide guidelines for helicopter pilots.

Źródło:

Journal of KONES; 2016, 23, 1; 345-352
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Critical review of propeller performance scaling methods, based on model experiments and numerical calculations

Autorzy:

Bugalski, T.
Streckwall, H.
Szantyr, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/258844.pdf

Data publikacji:

2013

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

propeller scale effects
open water tests
computational fluid dynamics (CFD)

Opis:

The article presents the results of experimental and numerical investigation of propeller scale effects, undertaken in co-operation of the Hamburg Ship Model Basin (HSVA), Germany, and Ship Design and Research Centre (CTO SA), Poland. The objective of the investigation was to test the adequacy of the methods currently used to account for the propeller scale effect and to develop possible improvement of the methods. HSVA has conducted model experiments in the large cavitation tunnel together with panel method and CFD calculations. CTO SA has performed model experiments in the towing tank, together with lifting surface and CFD calculations. Both institutions have suggested different new approaches to the problem and different new procedures to account for the propeller scale effects. In the article the procedures are presented together with the description of the underlying experimental and theoretical research.

Źródło:

Polish Maritime Research; 2013, 4; 71-79
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Badania numeryczne możliwości intensyfikacji wymiany ciepła z wykorzystaniem zjawiska streamingu akustycznego

Autorzy:

Machaj, Krystian
Malecha, Ziemowit

Powiązania:

https://bibliotekanauki.pl/articles/37217970.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

konwekcyjna wymiana ciepła
streaming akustyczny
Computational Fluid Dynamics
efekt barokliniczny

Opis:

W pracy przeprowadzono badania numeryczne streamingu akustycznego, wywołanego ścianą drgającą z częstotliwością 20 kHz oraz 40 kHz w kanale o przekroju prostokątnym. Częstotliwość oscylacji ściany dostosowano do długości kanału tak, aby wytworzyć sinusoidalną falę stojącą. Uśredniono przepływ w kanale i pokazano strukturę przepływu będącego streamingiem akustycznym. Dodatkowo wprowadzono różnicę temperatur między górną i dolną ścianą kanału. Pokazano, że streaming akustyczny intensyfikuje wymianę ciepła między ścianami kanału oraz że jego intensywność zwiększa się wraz z różnicą temperatury między ścianami. Wskazano również na potencjalne wykorzystanie badanego zjawiska do chłodzenia elektroniki w warunkach braku grawitacji (braku konwekcji naturalnej).

Źródło:

Zeszyty Energetyczne; 2020, 7; 355-372
2658-0799

Pojawia się w:

Zeszyty Energetyczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Numerical analysis of volatile organic compounds concentration in A C segmnet vehicle interior – diesel engine exhoust pollution

Autorzy:

Dudycz, A.
Górniak, A.
Janicka, A.
Rodak, M.
Skrętowicz, M.
Trzmiel, K.
Włostowski, R.
Woźniak, J.
Zawiślak, M.

Powiązania:

https://bibliotekanauki.pl/articles/2073654.pdf

Data publikacji:

2015

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

computational fluid dynamics CFD
volatile organic compounds (VOCs)
diesel engine

Opis:

In large cities the number of inhabitants constantly increases. It is caused by economic issues. The evergrowing populations causes more intense traffic and in consequence increase of air pollutions. Topology and roads configuration is conducive to the accumulation of toxic substances. Harmful substances accumulates inside the vehicles interiors which significantly deteriorate microclimate within the cabin. The study aimed to determine the amount of harmful substances getting into the interior of vehicles and their distribution have been presented in this paper.

Źródło:

Journal of Polish CIMEEAC; 2015, 10, 1; 45--52
1231-3998

Pojawia się w:

Journal of Polish CIMEEAC

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Modelling of influence of turbulent transition on heat transfer conditions

Autorzy:

Bochon, K.
Wróblewski, W.
Dykas, S.

Powiązania:

https://bibliotekanauki.pl/articles/1943251.pdf

Data publikacji:

2008

Wydawca:

Politechnika Gdańska

Tematy:

laminar-turbulent transition
Conjugate Heat Transfer (CHT)
computational fluid dynamics CFD

Opis:

This article deals with the turbulent transition phenomenon modelling and its influence on heat transfer. The purpose of the analyses was to verify the transition modelling implemented in the ANSYS CFX 11 commercial code for popular test cases (low flow speed) described in literature, and then use it for verification of the in-house CFD code (created for compressible flows). The inhouse CFD code has been extended lately for the Conjugate Heat Transfer modelling (CHT) as well, taking into account important flow effects, especially the turbulent transition. A Wilcox k-omega turbulence model with the Low-Reynolds modification was used in the in-house code. The calculations in ANSYS CFX were made using an SST turbulence model and a gamma-theta transition model. A fully turbulent flow was modelled by means of both codes, and the results were compared with the available experimental data. Then, the turbulent transition for several test cases was analysed with ANSYS CFX. Afterwards, the in-house CFD code was verified by means of ANSYS CFX for a higher flow speed (Mach numbers). The CHT modelling was analysed by means of both codes and the results were compared and discussed. The conducted analyses show that the results obtained by means of both codes are comparable, but the turbulence model used in the in-house CFD code is simpler and requires less computation time. A modification of two equations turbulence models can be an alternative for design problems in more developed laminar/turbulent flows.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 173-184
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Radiotracer experiments and CFD simulation for industrial hydrocyclone performance

Autorzy:

Stęgowski, Z.
Nowak, E.

Powiązania:

https://bibliotekanauki.pl/articles/146834.pdf

Data publikacji:

2007

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

computational fluid dynamics (CFD)
industrial hydrocyclone
selectivity
radioisotope tracer
copper industry

Opis:

Hydrocyclone is a device for solid concentration or selection of solid particles from a liquid-solid mixture. It is widely used in the mineral industry for selection of solid particles from a few to a few hundred micrometers. This paper presents a radiotracer experiment and computational simulation of selection of solid particles in a hydrocyclone of Fi-500 mm, which is used in the industrial copper ore concentration process. The simulation, based on computational fluid dynamics (CFD) techniques, allowed obtaining the velocity and concentration distribution for a real mixture flowing in the hydrocyclone. The mixture was composed of water and nine solid phases of different grain sizes. Finally, the selection curve of solid grains was obtained and compared with the experimental radiotracer results.

Źródło:

Nukleonika; 2007, 52, 3; 115-123
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Numerical analysis of influence of streamline rudder on screw propeller efficiency

Autorzy:

Abramowski, T.
Handke, J.
Szelangiewicz, T.

Powiązania:

https://bibliotekanauki.pl/articles/259235.pdf

Data publikacji:

2010

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

Streamline rudder, improvement of screw propeller efficiency
computational fluid dynamics (CFD)

Opis:

During designing the ship its designer tends to obtain as high as possible efficiency of ship propulsion system. To this end on certain ships additional elements such as: nozzles, half-nozzles or suitably profiled fins attached to underwater part of ship’s hull before screw propeller, are applied (sometimes they are intended for the mitigating of vibration resulting from operation of screw propeller). Another device which affects operation of screw propeller is streamline rudder capable of improving its efficiency (most of the transport ships is fitted with single screw propeller and streamline rudder placed behind it). In this paper the influence of streamline rudder on screw propeller efficiency has been examined with the use of numerical methods of fluid dynamics (CFD).The obtained results indicate a very favourable influence of the rudder on screw propeller efficiency. Research in this area is continued and its results concerning impact of particular geometrical parameters of rudder on screw propeller efficiency, will be presented in the future.

Źródło:

Polish Maritime Research; 2010, 2; 18-22
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Passive cooling through the atmospheric window for vehicle temperature control

Autorzy:

Khan, Umara
Zevenhoven, Ron

Powiązania:

https://bibliotekanauki.pl/articles/1955001.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

thermal radiation
passive cooling
vehicle skylight
greenhouse effect
computational fluid dynamics

Opis:

One of the most energy-intensive activities for a vehicle is space air conditioning, for either cooling or heating. Considerable energy savings can be achieved if this can be decoupled from the use of fuel or electricity. This study analyzes the opportunities and effectiveness of deploying the concept of passive cooling through the atmospheric window (i.e. the 8– 14 nm wavelength range where the atmosphere is transparent for thermal radiation) for vehicle temperature control. Recent work at our institute has resulted in a skylight (roof window) design for passive cooling of building space. This should be applicable to vehicles as well, using the same materials and design concept. An overall cooling effect is obtained if outgoing (long wavelength greater than 4 nm) thermal radiation is stronger than the incoming (short wavelength less than 4 nm) thermal radiation. Of particular interest is to quantify the passive cooling of a vehicle parked under direct/indirect sunlight equipped with a small skylight, designed based on earlier designs for buildings. The work involved simulations using commercial computational fluid dynamics software implementing (where possible) wavelengthdependency of thermal radiation properties of materials involved. The findings show that by the use of passive cooling, a temperature difference of up to 7–8 K is obtained with an internal gas flow rate of 0.7 cm/s inside the skylight. A passive cooling effect of almost 27 W/m2 is attainable for summer season in Finland. Comparison of results from Ansys Fluent and COMSOL models shows differences up to about 10 W/m2 in the estimations.

Źródło:

Archives of Thermodynamics; 2021, 42, 3; 25--44
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Capture efficiency of magnetically labeled particles traveling through an intracranial aneurysm

Autorzy:

Cardona, M.
Ramírez, J.
Benavides-Moran, A. G.

Powiązania:

https://bibliotekanauki.pl/articles/1839903.pdf

Data publikacji:

2021

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

magnetohydrodynamika
dynamika płynów
śródbłonek
endothelization
particle manipulation
computational fluid dynamics
magnetohydrodynamics

Opis:

Cell manipulation using external magnetic fields has been proposed to accelerate the neck reendothelization of saccular unruptured stented intracranial aneurysms. This work presents a computational fluid dynamics (CFD) model of a Saccular Brain Aneurysm that incorporates a helicoidal stent. An Eulerian-Lagrangian model implemented in ANSYS-Fluent is used to simulate the hemodynamics in the aneurysm. In silico studies have been conducted to describe the incidence of the magnetic field direction, frequency and amplitude on the blood hemodynamics and particle capture efficiency, when an external magnetic field is used to trap magnetically labeled particles traveling through the aneurysm. It is found that the magnetic field direction affects the particle concentration in the target region. Simulation results show that the highest particle capture efficiency is obtained with a 1T magnetic field amplitude in an open bore MRI scanner, when a permanent magnet is used.

Źródło:

International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 65-75
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Numerical analysis of effect of asymmetric stern of ship on its screw propeller efficiency

Autorzy:

Abramowski, T.
Żelazny, K.
Szelangiewicz, T.

Powiązania:

https://bibliotekanauki.pl/articles/259413.pdf

Data publikacji:

2010

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

asymmetric ship’s stern
computational fluid dynamics (CFD)
screw propeller efficiency

Opis:

During designing the ship its designer tends to achieve as-high-as possible efficiency of ship’s propulsion system. The greatest impact on the efficiency is introduced by ship’s screw propeller whose efficiency depends not only on its geometry but also distribution of wake current velocity. To change wake current distribution and improve propeller efficiency an asymmetric form is usually applied to stern part of ship hull. This paper presents results of numerical analysis of wake current velocity distribution, performed by using a CFD method for a B 573 ship of symmetric stern and the same ship of an asymmetric stern. Next, the mean values of screw propeller efficiency in non-homogenous water velocity field were calculated for both the hull versions of B 573 ship.

Źródło:

Polish Maritime Research; 2010, 4; 13-16
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

A complete design of contra-rotating propellers using the new computer system

Autorzy:

Koronowicz, T.
Krzemianowski, Z.
Tuszkowska, T.
Szantyr, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/259381.pdf

Data publikacji:

2010

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

ship propellers
contra-rotating propellers
esign methods
computational fluid dynamics (CFD)

Opis:

The computer system for the complete design of the contra-rotating propellers presented in this article has several common blocks and procedures with the systems for design of single propellers and tandem corotating propellers, presented in detail in the Polish Maritime Research No.1 and No.4 of the Volume 16, 2009. In this article only the blocks and procedures developed specially for the contra-rotating propellers are described. The system is based on the lifting line and lifting surface models and on the Computational Fluid Mechanics methods. The comparative analysis of the contra-rotating propellers and the tandem corotating propellers is included.

Źródło:

Polish Maritime Research; 2010, 1; 14-24
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Three - dimensional numerical simulations of the combustion chamber of the rotating detonation engine

Autorzy:

Folusiak, M.
Swiderski, K.
Kobiera, A.
Lukasik, B.
Wolanski, P.

Powiązania:

https://bibliotekanauki.pl/articles/245644.pdf

Data publikacji:

2013

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

rotating detonation engine (RDE)
RDE
computational fluid dynamics (CFD)
CFD
REFLOPS

Opis:

From 2010 Warsaw University of Technology (WUT) and Institute of Aviation (IoA) jointly implement the project under the Innovative Economy Operational Programme entitled ‘Turbine engine with detonation combustion chamber’. The goal of the project is to replace the combustion chamber of turboshaft engine GTD-350 with an annular detonation chamber. During the project, the numerical group that aims to develop computer code allowing researchers to simulate investigated processes has been established. Simulations provide wide range of parameters that are hardly available from experimental results and enable better understanding of investigated processes. Simulations may be also considered as a cheap alternative for experiments, especially when testing geometrical optimizations. In this paper the analysis of simulation results of the combustion chamber of the Rotating Detonation Engine (RDE) investigated at the IoA in Warsaw is presented. Primarily, REFLOPS USG which has become a fundamental numerical tool in the research of the RDE at the IoA is briefly described and governing equations and numerical methods used are shortly presented. Some aspects of numerical simulations of the RDE, related to selection of combustion mechanism, and an initiation of rotating detonation are provided. Secondly, results of simulations of inviscid gas with numerical injectors of hydrogen are compared with available experimental results. Three different wave patterns are identified in numerical solution and briefly described. Results of simulations are compared to experimental results in combustion chamber. Results presented in this paper are part of the project UDA-POIG.01.03.01-14-071 ‘Turbine engine with detonation combustion chamber’ supported by EU and Ministry of Regional Development, Poland.

Źródło:

Journal of KONES; 2013, 20, 1; 83-88
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Feasibility study of RANS in predicting propeller cavitation in behind-hull conditions

Autorzy:

Zhang, Yuxin
Wu, Xiao-ping
Lai, Ming-yan
Zhou, Guo-ping
Zhang, Jie

Powiązania:

https://bibliotekanauki.pl/articles/1573849.pdf

Data publikacji:

2020

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

RANS
Computational Fluid Dynamics (CFD)
propeller cavitation
turbulence model
grid sensitivity

Opis:

The propeller cavitation not only affects the propulsive efficiency of a ship but also can cause vibration and noise. Accurate predictions of propeller cavitation are crucial at the design stage. This paper investigates the feasibility of the Reynolds-averaged Navier–Stokes (RANS) method in predicting propeller cavitation in behind-hull conditions, focusing on four aspects: (i) grid sensitivity; (ii) the time step effect; (iii) the turbulence model effect; and (iv) ability to rank two slightly different propellers. The Schnerr-Sauer model is adopted as the cavitation model. A model test is conducted to validate the numerical results. Good agreement on the cavitation pattern is obtained between the model test and computational fluid dynamics. Two propellers are computed, which have similar geometry but slightly different pitch ratios. The results show that RANS is capable of correctly differentiating the cavitation patterns between the two propellers in terms of the occurrence of face cavitation and the extent of sheet cavitation; moreover, time step size is found to slightly affect sheet cavitation and has a significant impact on the survival of the tip vortex cavitation. It is also observed that grid refinement is crucial for capturing tip vortex cavitation and the two-equation turbulence models used – realizable k-ε and shear stress transport (SST) k-ω – yield similar cavitation results.

Źródło:

Polish Maritime Research; 2020, 4; 26-35
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Numerical analysis of influence of ship hull form modification on ship resistance and propulsion characteristics. Part I. Influence of hull form modification on ship resistance characteristics

Autorzy:

Szelangiewicz, T.
Abramowski, T.

Powiązania:

https://bibliotekanauki.pl/articles/258900.pdf

Data publikacji:

2009

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

ship hull geometry
computational fluid dynamics (CFD)
resistance
wake
propeller efficiency

Opis:

After signing ship building contract shipyard’s design office orders performance of ship resistance and propulsion model tests aimed at, apart from resistance measurements, also determination of ship speed, propeller rotational speed and propulsion engine power for the designed ship, as well as improvement of its hull form, if necessary. Range of ship hull modifications is practically very limited due to cost and time reasons. Hence numerical methods, mainly CFD ones are more and more often used for such tests. In this paper consisted of 3 parts, are presented results of numerical calculations of hull resistance, wake and efficiency of propeller operating in non-homogenous velocity field, performed for research on 18 hull versions of B573 ship designed and built by Szczecin Nowa Shipyard.

Źródło:

Polish Maritime Research; 2009, 4; 3-8
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Determination of the aerodynamic drag of pneumatic life rafts as a factor for increasing the reliability of rescue operations

Autorzy:

Jachowski, Jacek
Książkiewicz, Edyta
Szwoch, Izabela

Powiązania:

https://bibliotekanauki.pl/articles/1955588.pdf

Data publikacji:

2021

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

life raft
simulation of drag force
leeway
computational fluid dynamics CFD

Opis:

Ensuring the safety of ship crews at sea is of the utmost importance. Life rafts are one of the basic components of any seagoing vessel and ensuring their stability is an important component of maritime research. This study concerns the determination of the aerodynamic drag coefficients of pneumatic life rafts in a full range of wind speed and directions. The drag coefficients are based on full-scale experimental studies and numerical calculations (computational fluid dynamics) carried out with Flow-3D software. Two types of life rafts are analysed in the numerical simulations, namely, a non-deformed raft and a raft deformed under the influence of wind pressure at a given flow velocity. The shape of the deformed pneumatic life raft is recreated on the basis of photographic documentation from experimental studies. The results of the numerical calculations are verified on the basis of full-scale flow experiments carried out at the Low Speed Wind Tunnel T-3 Laboratory at the Institute of Aviation in Warsaw. This study shows that there is a dependence of aerodynamic drag on the degree of deformation of the above-water part of the life raft, as well as the angle of the raft setting to the wind. In real water conditions, this angle depends mainly on the anchor point of the drift anchor and therefore should be considered at the design stage, which will directly reduce the wind leeway of the raft.

Źródło:

Polish Maritime Research; 2021, 3; 128-136
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Numerical analysis of influence of ship hull form modification on ship resistance and propulsion characteristics. Part II. Influence of hull form modification on wake current behind the ship

Autorzy:

Abramowski, T.
Szelangiewicz, T.

Powiązania:

https://bibliotekanauki.pl/articles/259395.pdf

Data publikacji:

2010

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

ship hull geometry
numerical (computational) fluid dynamics
resistance
wake
propeller efficiency

Opis:

After signing ship building contract shipyard’s design office orders performance of ship resistance and propulsion model tests aimed at, apart from resistance measurements, also determination of ship speed, propeller rotational speed and propulsion engine power for the designed ship, as well as improvement of its hull form, if necessary. Range of ship hull modifications is practically very limited due to cost and time reasons. Hence numerical methods, mainly CFD ones are more and more often used for such tests. In this paper consisted of three parts, are presented results of numerical calculations of hull resistance, wake and efficiency of propeller operating in non-homogenous velocity field, performed for research on 18 hull versions of B573 ship designed and built by Szczecin Nowa Shipyard.

Źródło:

Polish Maritime Research; 2010, 1; 3-9
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Oddziaływanie wiatru na przepływ powietrza w tunelach
The wind influence on flow field in tunnels

Autorzy:

Sztarbała, G

Powiązania:

https://bibliotekanauki.pl/articles/362380.pdf

Data publikacji:

2011

Wydawca:

Instytut Fizyki Budowli Katarzyna i Piotr Klemm

Tematy:

oddziaływanie wiatru
przepływ powietrza w tunelach
obliczenia numeryczne
obliczeniowa mechanika płynów
CFD
Computational Fluid Dynamics
wind influence
flow field in tunnels
numerical computations
computational fluid dynamics (CFD)

Opis:

W niniejszym artykule zostały zaprezentowane wyniki obliczeń numerycznych oddziaływania wiatru na przepływ powietrza w tunelach. Zagadnienie oddziaływania wiatru na przepływ powietrza w tunelach odgrywa istotną rolę przy projektowaniu wentylacji bytowej, systemów bezpieczeństwa pożarowego tuneli a w szczególności systemów wentylacji pożarowej oraz systemów detekcji pożaru. W przypadku nieuwzględnienia wiatru na etapie projektowania wyżej wymienionych systemów prawidłowe wykrycie pożaru oraz skuteczne funkcjonowanie systemu wentylacji pożarowej będą bardzo utrudnione, a w niektórych przypadkach nawet niemożliwe. Artykuł ten stanowi fragment prowadzonej przez autora pracy badawczej.
In this paper there are presented results of the numerical analyses of the wind influence on flow field in tunnels. The results show that wind shall be considered during ventilation design process.

Źródło:

Fizyka Budowli w Teorii i Praktyce; 2011, T. 6, nr 4, 4; 77-80
1734-4891

Pojawia się w:

Fizyka Budowli w Teorii i Praktyce

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Computational design and optimisation of innovative, high-efficiency wind turbine

Autorzy:

Stalewski, W.
Zalewski, W.

Powiązania:

https://bibliotekanauki.pl/articles/246604.pdf

Data publikacji:

2015

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

green power
wind turbine
computational fluid dynamics (CFD)
computer-aided design
optimisation

Opis:

New concept of innovative, high-efficiency wind turbine has been developed and optimised. The turbine consists of a rotor with a vertical axis of rotation and a ring-palisade casing, which task is to deflect wind stream so that it flows perpendicularly to the rotor plane. The main advantage of such configuration of a wind turbine is that due to the vertical axis of symmetry, it works independently on the wind direction and it does not need any mechanism directing it towards the wind. The greatest challenge when designing the turbine was to minimise losses of energy of the wind stream deflected by 90 degrees by the ring vanes of the casing. This involved optimisation of number, shapes and mutual positions of the ring vanes. The whole optimisation works were done based on computational methods of Computer-Aided Design and Optimisation and Computational Fluid Dynamic. Subsequent variants of the ring-palisade casing were designed using an appropriately adapted in-house-software package supporting design and optimisation of multi-element airfoils. Three-dimensional analysis of flow around and inside the casing was conducted by application of commercial URANS solver ANSYS FLUENT. Eventually designed turbine is characterised by high efficiency in respect of acceleration of the wind stream. On the basis of computer simulations, it is estimated that the average velocity of air stream flowing through the rotor plane may be higher than the wind speed by about 45%. Extent of the acceleration of the wind stream partially depends on the number of ring vanes comprising a casing. Depending on specificity of application, this number of ring vanes may be chosen by a compromise between performance and dimensions of the turbine. The proposed wind turbine seems to be very promising solution, especially within the area of small and moderate renewable-energy sources, which in particular may be placed directly in residential-building areas, e.g. on the roofs of houses. This type of renewable-energy sources may also be successfully used in the field of environmentally friendly transport, in the process of producing hydrogen as fuel for fuel cell vehicles.

Źródło:

Journal of KONES; 2015, 22, 2; 221-232
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

A numerical simulation study of mold filling in the injection molding process

Autorzy:

Baum, Markus
Anders, Denis

Powiązania:

https://bibliotekanauki.pl/articles/29520096.pdf

Data publikacji:

2021

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

injection molding
polymers
Hele-Shaw approximation
computational fluid dynamics
computing methods

Opis:

Injection molding can undoubtedly be regarded as one of the most widely used manufacturing processes for polymers (Guevara-Morales & Figueroa-Lopez, 2014). Furthermore, injection molding has found its way into various branches of industry (Fernandez et al., 2018) since it has several essential advantages over other processing techniques in terms of good surface finish, the ability to process complex parts without the need for secondary operations, and low cost for mass production. In order to find optimal process settings, it is necessary to gain a deeper insight into the filling process and the underlying physical phenomena, as well as a thorough understanding of the complex material behavior. In this context, the numerical simulation of the injection molding process is increasingly important. Therefore, the current contribution is dedicated to present a thorough comparative numerical study for the mold filling of an exemplary thin-walled mold geometry, including a realistic non-Newtonian viscosity model for the polymer melt. For the numerical simulation, the authors employ the commercial CFD software packages Cadmould 3D-F and ANSYS CFX. While ANSYS CFX is a well-established CFD software for numerical modelling of multiphysical phenomena, Cadmould 3D-F is a highly specialized and computationally efficient alternative suitable for certain geometric configurations in the context of injection molding. The present study is new in the sense that it demonstrates the equivalence of the considered software packages for the simulation of the injection molding process in thin-walled mold geometries.

Źródło:

Computer Methods in Materials Science; 2021, 21, 1; 25-34
2720-4081
2720-3948

Pojawia się w:

Computer Methods in Materials Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Integration of optoelectronic components with LTCC (low temperature co-fired ceramic) microfluidic structure

Autorzy:

Malecha, K.

Powiązania:

https://bibliotekanauki.pl/articles/220539.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

LTCC (low temperature co-fired ceramics)
microfluidic
absorbance
CFD Computational Fluid Dynamics

Opis:

Investigations on integration of optoelectronic components with LTCC (low temperature co-fired ceramics) microfluidic module are presented. Design, fabrication and characterization of the ceramic structure for optical absorbance is described as well. The geometry of the microfluidic channels has been designed according to results of the CFD (computational fluid dynamics) analysis. A fabricated LTCC-based microfluidic module consists of an U-shaped microchannel, two optical fibers and integrated light source (light emitting diode) and photodetector (light-to-voltage converter). Properties of the fabricated microfluidic system have been investigated experimentally. Several concentrations of potassium permanganate (KMnO4) in water were used for absorbance/transmittance measurements. The test has shown a linear detection range for various concentrations of heavy metal ions in distilled water. The fabricated microfluidic structure is found to be a very useful system in chemical analysis.

Źródło:

Metrology and Measurement Systems; 2011, 18, 4; 713-721
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

Numerical simulation and theoretical analysis of the 3D viscous flow in centrifugal impellers

Autorzy:

Kang, S.
Hirsch, Ch.

Powiązania:

https://bibliotekanauki.pl/articles/1967654.pdf

Data publikacji:

2001

Wydawca:

Politechnika Gdańska

Tematy:

centrifugal compressor
secondary flow
CFD
computational fluid dynamics CFD
tip leakage flows

Opis:

This paper investigates the three-dimensional viscous ow in centrifugal impellers through theoretical analysis and numerical simulations, which is a summary of the authors' recent work. A quantitative evaluation of the dierent contributions to the streamwise vorticity is performed, namely, the passage vortices along the endwalls due to the ow turning; a passage vortex generated by the Coriolis forces proportional to the local loading and mainly active in the radial parts of the impeller; blade surface vortices due to the meridional curvature. In the numerical simulation the NASA Large Scale Centrifugal Compressor (LSCC) impeller with vaneless diuser is computed at three ow rates. An advanced Navier-Stokes solver, EURANUS/TURBO is applied with an algebraic turbulence model of Badwin-Lomax and a linear k-" model for closure, for dierent meshes. An in-depth validation has been performed based on the measured data. An excellent agreement is obtained for most of the data over a wide region of the ow passage. Structures of the 3D ow in the blade passage and the tip region, and their variations with ow rate as well, are analysed based on the numerical results.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 433-458
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

Blood flow in cerebral arteries – automated way from Computed Tomography to ANSYS Fluent

Autorzy:

Bodys, J.
Poraj, J.
Kryś, M.

Powiązania:

https://bibliotekanauki.pl/articles/132130.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

Computational Fluid Dynamics
CFD
blood flow
meshing
Computed Tomography Scan
CT scan

Opis:

With the constant growth of computer simulation significance in science and engineering, many new fields are gaining access to these powerful tools. One of these new disciplines is medicine. Human body provides many fascinating areas that could be researched from completely different angle and could gain all the benefits that computer simulation offers. For example blood flow in human arteries can be studied using Computational Fluid Dynamics. Researchers of cerebrovascular disorders can get an insight view on physical phenomena of blood flow and study risk factors of embolism or cerebral aneurysm. Main issue in using computer simulation in medical research is the complexity and uniqueness of geometry that needs to be handled. After all, human body is one of the most sophisticated engineering systems created by nature. In this paper, a workflow for creating a numerical mesh for CFD simulation purposes is shown. Application shown in the example focus on cerebral arteries blood flow simulation. Numerical mesh is generated based on CT scan of patient’s head, using freeware tools Slicer3D and AutoIt3 as well as commercial software ANSYS Fluent Meshing 15.0.

Źródło:

Advanced Technologies in Mechanics; 2015, 2, no. 1 (2); 9-14
2392-0327

Pojawia się w:

Advanced Technologies in Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

A complete design of tandem co-rotating propellers using the new computer system

Autorzy:

Koronowicz, T.
Krzemianowski, Z.
Tuszkowska, T.

Powiązania:

https://bibliotekanauki.pl/articles/259409.pdf

Data publikacji:

2010

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

ship propellers
tandem co-rotating propellers
design methods
computational fluid dynamics (CFD)

Opis:

The computer system for the complete design of the tandem co-rotating propellers, presented in this article, has several common blocks and procedures with the computer system for the design of conventional single propellers, presented in detail in Polish Maritime Research No. 1 Vol. 16 (2009). In this article only these blocks and procedures are described, which are different in both systems. The comparative analysis of the designed tandem propeller and a conventional propeller is also included.

Źródło:

Polish Maritime Research; 2010, 4; 17-25
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

Aerodynamic performance of a new double-flap wing sail

Autorzy:

Li, Dongqin
Zhang, Yili
Li, Peng
Dai, Jingjing
Li, Guohuan

Powiązania:

https://bibliotekanauki.pl/articles/260534.pdf

Data publikacji:

2019

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

double-flap wing sail
aerodynamic performance
Computational Fluid Dynamics (CFD)
parameter optimization

Opis:

As a type of natural energy resource, wind power is used in the modern implementation of wind-assisted technologies as a method for reducing the fuel consumption and environmental pollution of ocean-going ships. In order to promote the full usage of ocean wind energy for cargo ships, an innovative type of ship propulsion-assisted wing sail is proposed in this paper. The propulsion efficiency of this new wing sail can be increased by enlarging its area in both the transverse and vertical directions in good weather conditions, and it can be folded up automatically in poor weather conditions, improving the sailing safety of the ship. The sail parameters relating to the gaps and rotation angles between different parts of the wing sail are compared, and the values giving the best aerodynamic performance are identified using CFD simulation technology. The results for the lift and drag coefficients for the new wing sail at different attack angles are also compared with those of traditional aerofoil sails, including an arc-shaped rigid sail and a variable-camber sail proposed in 2015. From the viewpoint of the sailing performance of the vessel, our results demonstrate that this new type of wing sail has good aerodynamic performance and can reduce fuel costs for commercial vessels.

Źródło:

Polish Maritime Research; 2019, 4; 61-68
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

Virtual ship’s roll decay test with the use of CFD technique

Autorzy:

Krata, P.
Jachowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/243570.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

sea transport
ship stability
roll simulation
roll decay test
computational fluid dynamics

Opis:

Since safety of navigation is related to the stability performance of a ship, the transverse stability is routinely calculated and measured. One of the crucial experimental approach is a roll decay test. Although, an obtained result of the roll decay test carried out on the full-scale ship needs to be compared to a benchmark enabling an estimation of the relevant stability. Nowadays such a benchmark is just based on the simplified GM-based IMO-recommended formula. This research aims at the more sophisticated method of ship’s natural period of roll estimation and thus her stability assessment. The CFD (computational fluid dynamics) technique is applied and the result of the free roll simulation is compared to the solution of a roll equation. The one degree-of-freedom roll equation is applied with regard to the nonlinear ship righting moment and the nonlinear damping moment obtained according to Ikeda’s method. The six degrees-of-freedom simulation of ship’s roll decay test was carried out by the use of FlowVision code utilizing the Reynolds-averaged Navier–Stokes equation with regard to the turbulent flows based on the eddy viscosity concept. The semi-empirical k-ε turbulence model was applied. Thereby, the CFD-based approach allows to get rid of any assumptions regarding the value of the damping coefficient, which is an advantage over the roll equation based approach.

Źródło:

Journal of KONES; 2016, 23, 2; 215-221
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

Optymalizacja pompy strumieniowej za pomocą metod CFD
Optimization of a jet pump using CFD methods

Autorzy:

Ludwig, W.
Dziak, J.
Sawiński, W.

Powiązania:

https://bibliotekanauki.pl/articles/2070849.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

strumienica
mechanika numeryczna płynów
optymalizacja
jet pump
computational fluid dynamics CFD
optimization

Opis:

W pracy przedstawiono wyniki optymalizacji pompy strumieniowej. W procesie optymalizacji wykorzystano popularne ostatnio metody CFD (numerycznej mechaniki płynów). Opracowany model CFD umożliwił obliczenie rozkładów prędkości oraz ciśnienia wewnątrz aparatu. Wyznaczono także współczynnik ejekcji, który porównano z danymi eksperymentalnymi. Błąd średni obliczeń dla 36 punktów pomiarowych wyniósł -10%. Za pomocą modelu CFD przetestowano wpływ zmiennych konstrukcyjnych i ruchowych na wartość współczynnika ejekcji. Wykazano, że strumienica posiada zbyt długą komorę mieszania, która powoduje nadmierne straty ciśnienia.
Results of the jet pump optimization were presented in the paper. CFD (Computational Fluid Dynamics) methods were used during optimization. The developed mathematical model enabled one to calculate the liquid velocity and pressure profiles inside the apparatus. The efficiency coefficient values obtained from the model differed from experimental results with the average error of-10%. The axial static pressure profile showed that the mixing chamber was too long and it should be shortened.

Źródło:

Inżynieria i Aparatura Chemiczna; 2010, 1; 67-68
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Prediction of turbomachinery flow physics from CFD - review of recent computations of APPACET test cases

Autorzy:

Gregory-Smith, D. G.
Crossland, S. C.

Powiązania:

https://bibliotekanauki.pl/articles/1967658.pdf

Data publikacji:

2001

Wydawca:

Politechnika Gdańska

Tematy:

turbomachinery
CFD
computational fluid dynamics CFD
turbulence modelling
grid dependence
unsteady interaction

Opis:

In order to maintain a competitive edge, the turbomachinery industry has to rely increasingly on design and analysis methods based on numerical simulation of flow. The European funded APPACET was set up to study the application of turbulence modelling and the simulation of unsteady interactions to provide guidelines for the application of CFD to design. This paper shows the results of computations of four of the test cases studied by the project. The importance of grid refinement has been clearly demonstrated, but no evidence was found that one family of turbulence models could be definitely better than the other. Compared to steady results, unsteady time-averaged solutions have not shown any major improvement in accuracy. However unsteady flow phenomena generating losses within each blade row have been captured and partly explained.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 407-431
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Three-dimensional cfd analysis to study the thrust and efficiency of a biologicallyinspired marine propulsor

Autorzy:

Lamas, M. I.
Rodríguez, J. D.
Rodríguez, C. G.
González, P. B.

Powiązania:

https://bibliotekanauki.pl/articles/259319.pdf

Data publikacji:

2011

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

fish swimming
marine propulsion
undulating fin
biomimetic
computational fluid dynamics (CFD)
CFD

Opis:

Aquatic animals, which are the result of many millions of years of evolutionary optimization, are very quick, efficient, robust, and versatile. Accordingly, biologically-inspired mechanisms which emulate the movement of animals have recently become very popular. For the efficient design of a propulsion system it is very important to analyze the fluid flow in detail. CFD (Computational Fluid Dynamics) has become a powerful technique to understand the phenomena because it gives extensive information about the fluid flow characteristics. In the present work, a propulsion system consisting of an undulating fin which emulates the fish swimming was built. In order to optimize the mechanism, several undulating configurations were studied using a 3D turbulent CFD model. The thrust, drag, efficiency and hydrodynamic characteristics were analyzed. Furthermore, it was shown that the efficiency and thrust depend strongly on the oscillation frequency, amplitude and wavelength. In order to validate this CFD model, the numerically obtained thrust was successfully compared with experimental results from the laboratory mechanism.

Źródło:

Polish Maritime Research; 2011, 1; 10-16
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Introduction to non-linear Thermal-FSI on the example of transient load of a thin-walled container

Autorzy:

Kraszewski, B.

Powiązania:

https://bibliotekanauki.pl/articles/1818166.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

thermal-FSI
CFD
computational fluid dynamics
CSD
computational solid dynamics
non-linear mechanics

Opis:

This paper presents the problems associated with the transient thermal load of structures exhibiting a non-linear relationship between load and strain. The mathematical model required to comprehensively describe the relationship between fluid and solid has been shown from different perspectives. In addition, the Newton-Raphson method has been referred to as a way of solving nonlinear equations. The article also presents the assumptions and results of numerical analysis of thin-walled container thermally loaded by contact with hot water. The conclusions drawn emphasize the importance of Thermal-FSI tools, especially in the power engineering sector.

Źródło:

Zeszyty Energetyczne; 2018, 5; 1--13
2658-0799

Pojawia się w:

Zeszyty Energetyczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

CFD Study of Base Drag of the Grot Rocket

Autorzy:

Sahbon, Nezar
Michałów, Maciej
Murpani, Siddharth
Żurawka, Paulina
Kaczmarek, Kacper

Powiązania:

https://bibliotekanauki.pl/articles/36822389.pdf

Data publikacji:

2023

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

base drag
computational fluid dynamics
rocket aerodynamics
sounding rockets
solid rocket propulsion

Opis:

Propulsion system operation is known to affect the aerodynamic characteristics of rockets. Specifically, the net axial force acting on a rocket in flight cannot be precisely obtained by combining the static thrust with drag values computed for a rocket with an inactive motor. One of the main reasons for this is the influence of motor operation on pressure at the base of the rocket. The aim of this paper is to investigate the effect of motor operation on the aerodynamic parameters of the Grot sounding rocket developed by the Students’ Space Association, Warsaw University of Technology. The study consists of two series of axisymmetrical computational fluid dynamic simulations of flow around the rocket - one with the motor being non-operational and the other with active thrust. In the post-processing phase, the axial force acting on various components of the rocket is computed, with an emphasis on the base and nozzle exit sections. Quantitative and qualitative differences between the cases with and without active thrust are highlighted and discussed. The obtained results are compared to a semi-empirical model found in the literature. Finally, a semi-empirical base drag model is proposed for use in Grot flight simulation.

Źródło:

Transactions on Aerospace Research; 2023, 2 (271); 1-16
0509-6669
2545-2835

Pojawia się w:

Transactions on Aerospace Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Pseudospectral approximation compared with control volume formulation and finite differences- some test cases

Autorzy:

Tyliszczak, A.
Bogusławski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1953944.pdf

Data publikacji:

2000

Wydawca:

Politechnika Gdańska

Tematy:

computational fluid dynamics CFD
CFD
spectral methods
pseudospectral method
supersonic flows
driven cavity

Opis:

The paper presents comparison of the pseudospectral method with low-order approximation for two test cases. The first test case is quasi one-dimensional supersonic flow through converging-diverging nozzle for which exact solution exists. The comparison of the error of pseudospectral approximation and upwind finite-differences using Steger-Warming flux splitting method shows high accuracy of the pseudospectral method even for few collocation points. The same conclusion is formulated for the second test case, namely incompressible flow in two-dimensional driven cavity solved by control volume formulation with modified QUICK upwinding scheme and SIMPLEC algorithm for pressure correction. As usually conclusions concerning accuracy of numerical methods are flow case dependent, but the two examples shown give some idea about the accuracy and resolution of spectral approximation versus standard CFD schemes.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 2; 193-202
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Study of flow behaviour in a three products hydrocyclone screen: numerical simulation and experimental validation

Autorzy:

Wang, Chuanzhen
Chen, Jianzhong
Shen, Lijuan
Ge, Linhan

Powiązania:

https://bibliotekanauki.pl/articles/109798.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

three productshydrocyclone screen
flow behaviour
Computational Fluid Dynamics
particle image velocimetry
water split

Opis:

A novel three products hydrocyclone screen (TPHS) has been successfully developed; it consists of a cylindrical screen embedded in a conventional hydrocyclone (CH). In the new liquid cyclone, the combination of centrifugal classification and screening was employed for particle separation based on size. The aim of this study is to investigate the flow behaviour in TPHS using numerical simulation and experimental validation. A computational fluid dynamics simulation with a 4.35 million grid scheme and linear pressure–strain RSM generated the economic and grid-independence solution, which agreed well with the experiments of particle image velocimetry and water split. The velocity vector profile reveals that TPHS represented similar flow patterns to CH, wherein in addition to the outer downward swirl flow, inner upward swirl flow, central down-flow, second circulatory flow, and mantle, a particular fluid flow named screen underflow was created in TPHS owing to the presence of a cylindrical screen. The velocity distribution demonstrates that in TPHS, relative to CH, with the increase in radius, the lower tangential and higher radial velocity first increased to a peak and subsequently decreased, while the axial velocity primarily reduced to zero, increased in the opposite direction, and finally decreased rapidly to zero again. In addition, a disadvantageous flow, namely, screen backflow, was generated in TPHS, wherein the farther away the flow is from the feed inlet, the earlier this flow behaviour occurred. However, the rational scheme of aperture size and screen length can completely remove the screen backflow in TPHS.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 4; 879-895
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Low voltage modular circuit breakers: FEM employment for modelling of arc chambers

Autorzy:

Kolimas, Ł.
Łapczyński, S.
Szulborski, M.
Świetlik, M.

Powiązania:

https://bibliotekanauki.pl/articles/201038.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

miniature circuit breaker
finite element method (FEM)
computational fluid dynamics (CFD)
arc chambers

Opis:

FEM (finite element method) is an essential and powerful numerical method that can explicitly optimize the design process of electrical devices. In this paper, the employment of FEM tools such as SolidWorks, COMSOL and ANSYS is proposed in order to aid electrical apparatuses engineering and modeling – those are arc chambers of modular circuit breakers. Procured models of arc chambers have been undergoing simulations concerning heating, electric potential distribution, electric charge velocity and traverse paths. The data acquired has been juxta-positioned against experimental data procured in the Short-Circuit Laboratory, Warsaw University of Technology. The reflection of the theoretical approach was clearly noted in the experimental results. Mutual areas of the modeled element expressed the same physical properties and robustness errors when tested under specific conditions – faithfully reflecting those which were experimented with. Moreover, the physical phenomena essential for electrical engineering could be determined already at the model stage. This procedure proved highly valuable during designing/engineering work in terms of material economy.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 61-70
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Numerical analysis of influence of ship hull form modification on ship resistance and propulsion characteristics. Part III. Influence of hull form modification on screw propeller efficiency

Autorzy:

Abramowski, T.
Żelazny, K.
Szelangiewicz, T.

Powiązania:

https://bibliotekanauki.pl/articles/259371.pdf

Data publikacji:

2010

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

ship hull geometry
numerical (computational) fluid dynamics (CFD)
resistance
wake current
propeller efficiency

Opis:

After signing ship building contract shipyard’s design office orders performance of ship resistance and propulsion model tests aimed at, apart from resistance measurements, also determination of ship speed, propeller rotational speed and propulsion engine power for the designed ship, as well as improvement of its hull form, if necessary. Range of ship hull modifications is practically very limited due to cost and time reasons. Hence numerical methods, mainly CFD ones are more and more often used for such tests. In this paper consisted of three parts, are presented results of numerical calculations of hull resistance, wake and efficiency of propeller operating in non-homogenous velocity field, performed for research on 18 hull versions of B573 ship designed and built by Szczecin Nowa Shipyard.

Źródło:

Polish Maritime Research; 2010, 1; 10-13
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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