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Tytuł:
Thermal analysis of Double Stator Switched Reluctance Machine (DSSRM) with and without a squirrel cage rotor
Autorzy:
Abbasian, M.
Jalali, H.
Powiązania:
https://bibliotekanauki.pl/articles/140844.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Computational Fluid Dynamics (CFD)
Finite Element Method (FEM)
squirrel cage
double stator
switched reluctance machine
thermal analysis
Opis:
Double Stator Switched Reluctance Machine (DSSRM) is a novel switched reluctance machine with limited information about its heat distribution and dissipation. This paper presents a two dimensional (2-D) thermal analysis of Double Stator Switched Reluctance Machine (DSSRM) to observe actual heat distribution in the parts of the machine, using Finite Element Method (FEM). Two topologies for the rotor of DSSRM are considered, Non-Squirrel Cage Double Stator Switched Reluctance Machine (NSCDSSRM) and Squirrel Cage Double Stator Switched Reluctance Machine (SC-DSSRM). The heat distribution of these two topologies is analyzed, using Computational Fluid Dynamics (CFD). Finally the results are presented and compared.
Źródło:
Archives of Electrical Engineering; 2017, 66, 1; 189-198
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Numerical Study of the Effect of a Natural Convective Boundary Layer around the Human Body on the Transfer of Heat through a Textile Structure
Numeryczne badanie wpływu naturalnej granicznej warstwy konwekcyjnej wokół ciała ludzkiego na przepływ ciepła przez struktury tekstylne
Autorzy:
Angelova, R. A.
Stankov, P.
Kyosov, M.
Powiązania:
https://bibliotekanauki.pl/articles/233238.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
convective boundary layer
computational fluid dynamics (CFD)
convective heat transfer
textiles
human body
konwekcyjna warstwa graniczna
obliczeniowa dynamika płynów
przekazywanie ciepła przez konwekcję
tekstylia
ludzkie ciało
Opis:
Heat losses from the human body occur through a barrier of one or more textile layers with particular permeability, thermal insulation, water absorption abilities, etc. The convective boundary layer (CBL) around the clothed body is disturbed during body movement, and the air layer between the body and the textile layer(s) is broken up, thus changing the heat transfer through the textile layer and its insulation abilities. The purpose of the present study was to evaluate the effect of the convective boundary layer around the human body on the heat transfer through a textile layer by numerical simulation, using Computational Fluid Dynamics and a commercial CFD software package, by means of the Finite Volume Method. A new approach for modeling a textile surface was applied based on the theory of jet systems. The results of the study indicated that heat transfer trough the textile barrier is strongly influenced by the speed of the convective layer around the human body and the textile layer placed in between the body and the environment.
Straty ciepła ciała ludzkiego występują poprzez barierę utworzoną z jednej lub więcej warstw tekstylnych o określonej przepuszczalności, termicznej, izolacyjności, zdolności absorpcji wody itd. Konwekcyjna warstwa graniczna wokół ubranego ciała zakłócana jest podczas ruchu tego ciała i warstwy powietrza pomiędzy ciałem i warstwą tekstylną, która może być przerwana i zmienić przepływ ciepła poprzez warstwę tekstylną, a tym samym właściwości izolacyjnych. Celem prezentowanych badań była ocena wpływu granicznej warstwy konwekcyjnej wokół ciała na przepływ ciepła za pomocą numerycznej symulacji przy zastosowaniu odpowiednich programów komputerowych i metody elementów skończonych. Zastosowano nową próbę modelowania powierzchni włókienniczej opartą na teorii systemów dysz. Wyniki badań wykazały, że przepływ ciepła przez bariery tekstylne ulega silnym wpływom prędkości powietrza w warstwie wokół ciała ludzkiego i pomiędzy warstwami tekstylnymi.
Źródło:
Fibres & Textiles in Eastern Europe; 2015, 6 (114); 131-137
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD modelling of CO2 capture in a packed bed by chemical absorption
Autorzy:
Asendrych, D.
Niegodajew, P.
Drobniak, S.
Powiązania:
https://bibliotekanauki.pl/articles/185228.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
carbon dioxide
carbon capture and storage (CCS)
2-phase flow
chemical absorption
computational fluid dynamics (CFD)
dwutlenek węgla
wychwytywanie i składowania dwutlenku węgla (CCS)
strumień 2-fazowy
absorpcja chemiczna
dynamika płynów (CFD)
Opis:
The paper deals with numerical modelling of carbon dioxide capture by amine solvent from flue gases in post-combustion technology. A complex flow system including a countercurrent two-phase flow in a porous region, chemical reaction and heat transfer is considered to resolve CO2 absorption. In order to approach the hydrodynamics of the process a two-fluid Eulerian model was applied. At the present stage of model development only the first part of the cycle, i.e. CO2 absorption was included. A series of parametric simulations has shown that carbon dioxide capture efficiency is mostly influenced by the ratio of liquid (aqueous amine solution) to gas (flue gases) mass fluxes. Good consistency of numerical results with experimental data acquired at a small-scale laboratory CO2 capture installation (at the Institute for Chemical Processing of Coal, Zabrze, Poland) has proved the reliability of the model.
Źródło:
Chemical and Process Engineering; 2013, 34, 2; 269-282
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD numerical simulation of the indirect cooling system of an internal combustion engine
Autorzy:
Biały, M.
Pietrykowski, K.
Tulwin, T.
Magryta, P.
Powiązania:
https://bibliotekanauki.pl/articles/133491.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
Ansys Fluent
combustion engine
computational fluid dynamics
CFD
cooling system
ANSYS Fluent
silnik spalinowy
obliczeniowa mechanika płynów
układ chłodzenia
Opis:
The paper presents an analysis of the fluid flow in the cooling system of an internal combustion engine with oposite pistons. The purpose of the work was to optimize the flow of fluid through the channels located in the engine block. Simulation studies and subsequent iterations were performed using Ansys Fluent software. Two-equation k-epsilon turbulence model was used in the simulation model. Boundary and initial conditions were taken from previously made simulations conducted in AVL Boost software. The average wall temperature of the cylinder and the temperature of the outer walls of the cylinder were assumed for simulations. The results of the analyzes were graphically illustrated by the speed streamline distribution of velocity fields and temperature.
Źródło:
Combustion Engines; 2017, 56, 3; 8-18
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of flow simulation models to the case of radial inflow onto a rotating core
Autorzy:
Biernacki, R.
Powiązania:
https://bibliotekanauki.pl/articles/1955813.pdf
Data publikacji:
2001
Wydawca:
Politechnika Gdańska
Tematy:
turbulent flow
numerical flow simulation
flow simulation models
steam turbines
turbine inlet
computational fluid dynamics CFD
Opis:
The paper presents the results of fluid flow simulations carried out by means of the FIDAP7.6 program (a fluid dynamics FEM package) for the case of radial inflow onto a rotating shaft. The particular geometric configuration has been chosen to resemble a generalized inlet chamber of twin low-pressure steam turbines, but with the axial outlet section extended to allow better observation of flow instabilities in that region. The calculations were carried out for the same channel geometry for both compressible and incompressible flow, using the same or slightly varying boundary conditions. Extensive variation in non-physical parameters of the model was explored, such as applying different meshes over the region, as well as utilizing different turbulence and upwinding models. The intent of this research was to evaluate the relative applicability of the various available flow models to the simulation of axisymmetric flows with steep velocity gradients, and to discover the limitations of these models. The calculations have in fact established significant differences in the behavior of the simulated flow for the different meshes and models. Some results were characterized by extensive areas of recirculating flow whereas others, for the same boundary conditions, showed no recirculation. Correct near-wall meshing as well as the choice of the upwinding scheme were established as the critical factors in this regard. There was also noticeable variation in outlet velocity profiles. An extensive zone of separation within the investigated channel as well as a standing annular vortex near the point of stagnation are flow features of some interest. These patterns of flow change in response to the changing non-physical parameters; the separation zone in particular is absent or slow to develop under some setups. The influence of inflow parameters, the initial velocity distribution and turbulent intensity in particular, on flow behavior in contact with the rotating shaft have also been an area of investigation, as these are often defined with considerable uncertainty in practical applications. It was observed that some latitude in assuming these parameters did not significantly alter the relevant flow parameters at outlet (the velocity and pressure distributions), although it did induce variation in other aspects of the flow (such as the extent of the standing vortex).
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 2; 141-154
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Zastosowanie numerycznej mechaniki płynów CFD do modelowania zabezpieczania pomieszczeń stałymi urządzeniami gaśniczymi gazowymi
Application of Computational Fluid Dynamics CFD for Modeling of Protection of Premises by Fixed Gaseous Extinguishing System
Autorzy:
Boroń, S.
Kubica, P.
Powiązania:
https://bibliotekanauki.pl/articles/372766.pdf
Data publikacji:
2016
Wydawca:
Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego
Tematy:
stałe urządzenie gaśnicze gazowe
gaz obojętny
czyste środki gaśnicze
czas retencji
model przepływu gazu przez pomieszczenie
numeryczna mechanika płynów CFD
fixed gaseous extinguishing system
inert gases
clean extinguishing agents
retention time
model of gas flow through the room
computational fluid dynamics CFD
Opis:
Cel: W artykule podjęto problem bezpieczeństwa pożarowego pomieszczeń chronionych instalacją stałych urządzeń gaśniczych gazowych. Zwiększenie precyzji i wiarygodności modelowania procesu gaszenia gazem gaśniczym można osiągnąć poprzez zastosowanie metod numerycznej mechaniki płynów CFD przy wykorzystaniu oprogramowania ANSYS FLUENT. Celem badań było opracowanie modelu numerycznego CFD wypływu gazu gaśniczego z przestrzeni chronionej i zbadanie z jego pomocą skuteczności gaśniczej określonych typów gazów. Projekt i metody: W artykule przedstawiono propozycję numerycznego modelu przepływu gazu gaśniczego przez pomieszczenie. Zawarto także opis badań eksperymentalnych i obliczeń analitycznych przeprowadzonych w celu jego walidacji. Wskazano na przykłady praktycznego wykorzystania opracowanego modelu CFD do symulacji, których wyniki mogą wspomagać projektowanie stałych urządzeń gaśniczych gazowych. Wyniki: Analiza porównawcza zebranych wyników symulacji pozwoliła wskazać model Standard k- ε jako model zapewniający największą zbieżność wyników z wynikami badań w skali rzeczywistej. Wartości czasu retencji uzyskane w drodze symulacji były bliższe wynikom rzeczywistym w porównaniu z wartościami otrzymanymi na podstawie obliczeń przeprowadzonych z wykorzystaniem modelu normowego. Wnioski: Modelowanie CFD umożliwia poddanie analizie mechanizmu przepływu gazu przez pomieszczenie z większą dokładnością niż dotychczas stosowane modele. Pozwala to na optymalizację doboru rodzaju oraz ilości gazu gaśniczego z uwagi na czas retencji. Dobór gazu gaśniczego o gęstości mieszaniny zbliżonej do gęstości powietrza daje możliwość uzyskania czasu retencji przekraczającego czas retencji otrzymany w przypadku zastosowania gazów wskazanych w obowiązujących normach. Zastosowanie modelowania CFD umożliwia prowadzenie badań przy wykorzystaniu przestrzeni wirtualnej, eliminując przy tym niebezpieczeństwo związane z prowadzeniem prac pomiarowych stanowiących zagrożenie dla ludzi oraz redukuje koszty finansowe związane z wyładowaniem gazu.
Aim: The problem of fire safety of areas protected by fixed gaseous extinguishing system is discussed. Increasing the accuracy and reliability of the modeling of gas extinguishing process can be achieved by using methods of computational fluid dynamics CFD using ANSYS FLUENT software. The aim of the study was to develop a numerical CFD model of extinguishing gas flow of the protected space and to examine the extinguishing effectiveness of particular type of norm gases and newly proposed extinguishing gas mixtures with a density similar to the density of air, which significantly limited the phenomenon of outflow of gas from the room and allowed to get longer retention times. Project and methods: The paper proposes a numerical model of extinguishing gas flow through the room which was developed using ANSYS Fluent program, the description of experimental researches carried out in real scale and analytical calculations based on the norm model of gas flow through the room carried out to validate the created CFD model. Examples of practical use of CFD model for simulation, results of which can provide information to support the design of fixed gaseous extinguishing systems were presented. Results: On the basis of a comparative analysis of the collected simulation results model Standard k-ε was indicated as a model that provides the greatest convergence of test results in real scale. Retention times obtained by the computer simulation were closer to real scale results than the retention times obtained on the basis of calculation using the norm wide interface model. Conslusions: The use of CFD modeling allows to review the mechanism of gas flow through the room with greater accuracy than previously used models. This allows for optimal selection of the type and amount of extinguishing gas due to the retention time. Selection of extinguishing gas with the mixture density similar to air density, makes it possible to obtain a retention time exceeding the retention time of the gases specified in the applicable standards. The use of CFD modeling allows to conduct research using virtual space, eliminating the danger related to measurement process posing a threat to humans and reduce financial costs associated with the discharge of extinguishing gas.
Źródło:
Bezpieczeństwo i Technika Pożarnicza; 2016, 42, 2; 151-157
1895-8443
Pojawia się w:
Bezpieczeństwo i Technika Pożarnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Application of CFD for analysis of the ship and propeller flow
Autorzy:
Bugalski, T. J.
Szantyr, J.
Powiązania:
https://bibliotekanauki.pl/articles/1953974.pdf
Data publikacji:
1998
Wydawca:
Politechnika Gdańska
Tematy:
computational fluid dynamics CFD
CFD
propeller flow
ships
Navier-Stokes equation
free surface
propeller operation
PANSHIP computer system
Opis:
The paper describes the computer system PANSHIP for analysis of flow around the ship hull moving with constant velocity in calm water, including the effects of free surface and propeller operation. This system calculates the potential flow using the discrete distribution of Rankine sources on the hull. Viscous flow is computed using the integral method in the bow section and Reynolds averaged Navier Stokes equation (RANS) in the stern section of the ship hull. Results of this analysis may be directly used in ship hull design and they may also serve as input for calculation of the unsteady flow phenomena accompanying propeller operation in the non-uniform velocity field generated by the hull. PANSHIP has been verified experimentally and it forms a useful tool available for ship designers and for marine hydrodynamicists.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 2; 349-356
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluid/solid coupled heat transfer analysis of a free rotating disc
Autorzy:
Bulat, P. V.
Volkov, K. N.
Powiązania:
https://bibliotekanauki.pl/articles/240377.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer
coupled analysis
computational fluid dynamics
finite element analysis
disc
rotating cavity
transport ciepła
sprzężona analiza
CFD
metoda elementów skończonych
tarcza
Opis:
The coupled fluid/solid heat transfer computations are performed to predict the temperatures reached in the rotating disc systems. An efficient finite element analysis (FEA) and computational fluid dynamics (CFD) thermal coupling technique is developed and demonstrated. The thermal coupling is achieved by an iterative procedure between FEA and CFD calculations. In the coupling procedure, FEA simulation is treated as unsteady for a given transient cycle. To speed up the thermal coupling, steady CFD calculations are employed, considering that fluid flow time scales are much shorter than those for the solid heat conduction and therefore the influence of unsteadiness in fluid regions is negligible. To facilitate the thermal coupling, the procedure is designed to allow a set of CFD models to be defined at key time points/intervals in the transient cycle and to be invoked during the coupling process at specified time points. The computational procedure is applied to predict heat transfer characteristics of a free rotating disc.
Źródło:
Archives of Thermodynamics; 2018, 39, 3; 169-192
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 140

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