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Wyświetlanie 1-15 z 399
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
Artykuł
Tytuł:
Relationships between CFD and Experimental Fluid Mechanics
Autorzy:
Sobieski, W.
Powiązania:
https://bibliotekanauki.pl/articles/950447.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
CFD
modeling methodology
Opis:
This paper analyzes three popular methods of developing simulation models based on experimental data. The presented variants are discussed with emphasis on their strengths and weaknesses, and they are illustrated with examples in the area of numerical fluid mechanics. The principles of developing computer models, details and objectives of mathematical models are not discussed. The relevant information can be found in the author’s previous studies which are available in scientific literature. The last section of the article proposes the most effective methods for combining and designing real and virtual experiments.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2013, 16(3); 169-178
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Selection of a numerical model to predict the flow in a fan with a cycloidal rotor
Autorzy:
Staśko, Tomasz
Majkut, Mirosław
Dykas, Sławomir
Smołka, Krystian
Powiązania:
https://bibliotekanauki.pl/articles/1955033.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fan
CFD
cyclorotor
Opis:
A fan with a cycloidal rotor (CRF) is a promising design for application in HVAC (heat, ventilation and air conditioning) systems. Despite the widespread use of the CRF design as a form of propulsion, there are practically no scientific publications examining the possibility of using it as the HVAC fan. The choice of the cycloidal rotor facilitates the operating procedure and widens the range of operating conditions. The paper focuses on the use of the CRF in HVAC, especially as a blowing machine integrated with rectangular ducts, presenting, and discussing the search for the most efficient numerical model. The way of discretizing the computational domain, the turbulence models and the time integration method were tested. A four-blade open rotor fan with a cycloidal impeller was used both in the numerical and in the experimental model. The 2D and 3D CRF models created in the Ansys CFX package were adopted. After a mesh-independence study, different turbulence models were tested for the selected mesh. In the case of the 2D model, various turbulence models such as the SST and the RNG k-ε options were tested and compared with each other. The computational fluid dynamics simulations were compared with in-house experimental results of the velocity field measurements performed by means of laser Doppler anemometry and thermoanemometry. It turned out that the considered numerical models did not reflect the experimental measurements quantitatively. This may be due to the small differences in the shapes of the cycloids of the rotor blades in the numerical model and in real geometry.
Źródło:
Archives of Thermodynamics; 2021, 42, 4; 3-15
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
CFD Ship Squat Determination Method Validation by GPS-RTK Measurements
Autorzy:
Gucma, M.
Schoeneich, M.
Jachowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/320532.pdf
Data publikacji:
2008
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
osiadanie
CFD
RTK
squat
Opis:
The paper presents the result of researches aimed to determine squat of ferry Jan Śniadecki in Świnoujście Port with use of CFD methods in compare with real measurements carried out by GPS-RTK methods. The results of validation were presented together with some practical conclusions.
Źródło:
Annual of Navigation; 2008, 13; 59-66
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD methods as a modern tool in optimisation of hydrodynamic conditions in magma crystallizers
Autorzy:
Synowiec, P.
Wójcik, J.
Bigda, J.
Powiązania:
https://bibliotekanauki.pl/articles/1955724.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
CFD
crystallization
hydraulic efficiency
Opis:
Selected parameters concerning the optimisation of hydrodynamics in magma crystallizers are discussed. At this stage, results of CFD (Computational Fluid Dynamics) simulations are shown, focused on the effect of the geometrical configuration of a crystallizer on energy dissipation rate, axial velocity field and general hydraulic efficiency. The influence of the shape of the apparatus' bottom, diameter of the stirrer, its location and presence of the draft tube on, respectively: (i) unit power input distribution, (ii) the average mixing power, and (iii) pumping capacity have been takeninto consideration. The results obtained from simulations have been compared with experiments and literature data.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 459-466
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiary lokalnych wartości stężenia w reaktorze przepływowym
Local distribution of tracer concentration in a flow reactor
Autorzy:
Makowski, Ł.
Orciuch, W.
Powiązania:
https://bibliotekanauki.pl/articles/2070909.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mieszanie
PLIF
CFD
mixing
Opis:
W pracy rozważano pracę reaktora rurowego z dozowaniem osiowym. Porównano doświadczalne rozkłady stężeń trasera uzyskane z wykorzystaniem zawansowanej technika laserowej PLIF z wynikami obliczeń numerycznych wykonanych przy użyciu pakietu obliczeniowej mechaniki płynów Fluent i modelu k-ε. Uzyskano dobrą zgodność wyników obliczeniowych z danymi doświadczalnymi.
The aim of this work was to collect experimental data regarding local mi-crostructures of inert tracer concentration in a pipe reactor with turbulent flow. The results of experiments, performed with the level resolution of several microns, can be used for direct validation of currently developed CFD models. Main problem in modeling of fast processes in turbulent flow is the correct description of mixing mechanisms in closest surroundings of a feeding place. Therefore, investigations of concentration distributions in this area were the most important in our work.
Źródło:
Inżynieria i Aparatura Chemiczna; 2010, 1; 69-70
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie modeli wielkowirowych do symulacji przebiegu złożonych reakcji chemicznych
Large Eddy Simulations of complex chemical reactions
Autorzy:
Makowski, Ł.
Bałdyga, J.
Powiązania:
https://bibliotekanauki.pl/articles/2070981.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mieszanie
LES
CFD
mixing
Źródło:
Inżynieria i Aparatura Chemiczna; 2010, 2; 77-78
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wpływu konstrukcji akumulacyjnego wymiennika ciepła na efektywność ogrzewania piecem na drewno i bilans cieplny urządzenia grzewczego
THE IMPACT OF THE CONSTRUCTION OF THE ACCUMULATION HEAT EXCHANGER ON THE HEAT BALANCE AND EFFICIENCY OF HEATING USING THE WOOD – FIRED STOVE
Autorzy:
Szubel, Mateusz
Basista, Grzegorz
Powiązania:
https://bibliotekanauki.pl/chapters/2231421.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
akumulacyjne wymienniki ciepła
CFD
Opis:
Urządzenia grzewcze małej mocy stosowane są do wytworzenia ciepła w gospodarstwach domowych. Źródło ciepła oraz system jego dystrybucji, czyli wewnętrzne elementy instalacji grzewczej tworzą kompletny układ ogrzewania budynku, przy czym źródłem ciepła najczęściej jest kocioł centralnego ogrzewania, piec albo kominek. W przypadku ostatniego z wymienionych typów jednostek, osiągnięcie satysfakcjonująco wysokiej sprawności ogrzewania jest utrudnione, z uwagi na oddawanie dużej ilości energii przez korpus kominka w stosunkowo krótkim czasie i stratę kominową, osiągającą kilkadziesiąt procent. Zwiększenie efektywności pracy kominka wymaga wyposażenia urządzenia w wymiennik wodny w postaci płaszcza (lub nasadzony na czopuch), odpowiedniej zabudowy konwekcyjnej albo wykorzystania ceramicznego wymiennika z materiału akumulującego ciepło spalin. Dzięki odpowiednim właściwościom materiałowym, wymienniki akumulacyjne pozwalają na wydłużenie cyklu grzewczego do ok. 10 godzin, przy jednoczesnym podwyższeniu sprawności systemu, dzięki znacznemu obniżeniu entalpii spalin ulatujących do czopucha. Niniejsza praca prezentuje porównanie dwóch alternatywnych konstrukcji akumulacyjnego wymiennika ciepła pod kątem parametrów pracy w systemie grzewczym opartym na współczesnym akumulacyjnym palenisku kominkowym, o mocy nominalnej 22,5 kW. Na podstawie analiz eksperymentalnych, przeprowadzonych na stanowisku pomiarowym wymiennika ceramicznego w konfiguracji wachlarzowej, opracowano zestaw założeń i warunków brzegowych umożliwiających budowę modelu numerycznego CFD (Computational Fluid Dynamics) tego urządzenia oraz alternatywnej konstrukcji w konfiguracji nasadowej. Wyniki modelowania numerycznego, przeprowadzonego za pomocą komercyjnego środowiska Workbench 15, pozwoliły na analizę wpływu geometrii wymiennika na jego podstawowe parametry pracy. Ponadto, w oparciu o porównanie wyników eksperymentów i symulacji przedyskutowano wiarygodność modeli.
The paper presents a comparison of two alternative constructions of accumulation heat exchanger on the operating parameters of the heating system, based on a modern accumulation hearth, with the nominal power of 22.5 kW. On the basis of experimental studies carried out on the test bench, the set of assumptions and boundary conditions necessary to design a numerical model has been developed. The numerical modeling of current state of the accumulation heat exchanger and alternative proposed design, using commercial code ANSYS Workbench 15 has been carried out. The results of measurement and simulation of the current configuration of the heat exchanger have been compared. Due to satisfying agreement between experimental and numerical data, the comparison of CFD (Computational Fluid Dynamics) models of two considered constructions of the accumulation heat exchanger was possible. Significant aspects of the constructions have been identified and discussed. Moreover, the impact of application of the accumulation heat exchanger on the total efficiency of the heating system has been determined.
Źródło:
Interdyscyplinarne zagadnienia w inżynierii i ochronie środowiska 6; 375-390
9788374938976
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Secondary flows occurring in a whirlpool separator – A study of phenomena – observation, simulation and measurements
Autorzy:
Jakubowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/952675.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
whirlpool
CFD
PIV
wir
Opis:
The whirlpool separator, used for hot trub separation, is prevalent in the brewing industry. It is a kind of a hydrocyclone inside of which a tea leaf effect occurs, which is sediment accumulation into a cone shape at the central part of the tank’s bottom. This manner of sediment accumulation is caused by the secondary flow occurring in the so-called Ekman boundary layer. This article is a summary of the research, which has been conducted for many years and involved observation, simulation and experimental research on the recognition and formation of the secondary flow accumulating the sediment cone. Secondary flows occurring in a whirlpool were identified through CFD simulation and PIV experiments, and are presented in this paper. Based on their location and direction, an attempt to determine their impact on the separation process taking place in the whirlpool has been made. The secondary flow identification methods proposed in this paper can be successfully applied in other solutions, e. g. structural ones, which involve rotational-flow-based separation.
Źródło:
Chemical and Process Engineering; 2015, 36, 3; 277-289
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of unsteady effects in the flow through a centrifugal fan using CFD/CAA methods
Autorzy:
Pritz, Balazs
Probst, Matthias
Wiśniewski, Piotr
Dykas, Sławomir
Majkut, Mirosław
Smołka, Krystian
Powiązania:
https://bibliotekanauki.pl/articles/1955074.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
centrifugal fan
CFD
CAA
Opis:
Besides centrifugal pumps, centrifugal fans are the most common turbomachines used in technical applications. They are commonly used in power engineering systems, such as heat engines and chillers, heating, ventilation, and air conditioning systems, supply and exhaust air systems. They are also used as machines consuming final energy (electricity). Therefore, any improvement in their efficiency affects the efficiency of energy generation and the level of electricity consumption. Many efforts have been made so far to find the most efficient numerical method of modelling flows in fans. However, only a few publications focus on the unsteadiness that may have an impact on device efficiency and noise generation. This paper presents an attempt to identify unsteadiness in the flow through a centrifugal fan by means of computational fluid dynamics and computational aeroacoustics methods. The works were performed using the Ansys CFX commercial software and the results of numerical studies are compared with experimental data.
Źródło:
Archives of Thermodynamics; 2021, 42, 4; 169-181
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
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