Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "CFD analysis" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-13 z 13
    Tytuł:
    The influence of boundary condition functions on the quality of the solution and its sensitivity to coefficients of k-? turbulence models
    Autorzy:
    Błazik-Borowa, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/390264.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    CFD
    k-? turbulence models
    sensitivity analysis
    square cylinder
    Opis:
    The paper is devoted to the problem of boundary conditions influence on the quality of the solution obtained with use of k-? turbulence models. There are calculation results for different boundary conditions and two methods: standard k-? and RNG k-? in the paper. The flow parameters obtained from the calculation are compared with our own measurement results. Moreover, the influence of input data on the inflow edge on sensitivity coefficients is shown and analysed in the paper. The research is performed for components of velocity and turbulence kinetic energy.
    Źródło:
    Budownictwo i Architektura; 2011, 8, 1; 15-26
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Search of an Inducer Geometry that is Beneficial for Lifting Parameters of a Lifted Object of a Selected Shape
    Poszukiwanie geometrii wzbudnika korzystnego dla parametrów unoszenia obiektu o wybranym kształcie
    Autorzy:
    Bastian, Bartosz
    Gawarkiewicz, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/189402.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    acoustic levitation
    modal analysis
    CFD
    lewitacja akustyczna
    analiza modalna
    Opis:
    The literature describes acoustic levitation phenomena with the utilization of air squeeze film between the vibrating inducer and the lifted object. The objective of the study is to determine the shape of the inducer with vibration characteristics that would allow the levitation of an object of the assumed geometry. In this paper, the influence of the dimension ratio of the inducer on the frequency of the first mode of vibration was presented. CFD calculations for a selected dimension series were performed with the goal of the determination of lifting conditions. The data obtained from the analysis will be used to manufacture an inducer that will serve as an experimental verification for the fluid dynamics calculation.
    W literaturze opisywane jest zjawisko lewitacji akustycznej z wykorzystaniem efektu wyciskania powietrza ze szczeliny między drgającym wzbudnikiem a unoszonym obiektem. Celem badań jest znalezienie takiego kształtu wzbudnika, którego charakterystyka drgań pozwalałaby na lewitację obiektu o założonej geometrii. W opracowaniu określono wpływ wymiarów wzbudnika na kształt oraz częstotliwość jego pierwszej postaci drgań własnych. Dla wybranego przypadku wykonano symulacje CFD w celu określenia warunków unoszenia. Uzyskane wyniki analiz posłużą do wykonania wzbudnika w celu przeprowadzenia weryfikacyjnych badań eksperymentalnych.
    Źródło:
    Tribologia; 2019, 287, 5; 13-17
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysing the cavitation phenomena in in-nozzle flows
    Autorzy:
    Vajda, B.
    Žunič, Z.
    Kegl, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/247508.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    two-phase flow
    cavitation
    injector nozzle
    CFD
    nodalisation analysis
    Opis:
    The geometry of the diesel fuel injection nozzle and fuel flow characteristics in the nozzle significantly affects the processes of fuel atomization, combustion and formation of pollutant emissions in diesel engine. To improve the process of fuel injection, CFD packages are used. Since CPU times are often high, partial models are used for the analysis. In presented paper the influence ,of different density of mesh on the cavitation phenomena is being analysed. The theoretical backgrounds of the cavitation occurrence presented in the first part of the paper are followed by the numerical analyses of two-phase flow in same simplified nozzle models. The numerical analyses are made using computation fluid dynamic (CFD) program Fire. The numerical analysis is made for two different types of fluid, diesel (D2) and biodiesel (B 100). Numerical analysis also includes various densities of meshes and their influence on results. The two-phase flow is analysed using a two-equation approach, where all conservation equations are solved for every phase. Numerical analysis results are compared to the experimental observations of the two-phase flow available from the literature. The results are compared for various meshes and various fluid types. The results show that higher pressure yields mode cavitation and point out the importance of mesh densities.
    Źródło:
    Journal of KONES; 2010, 17, 2; 475-482
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    Tytuł:
    Analysis of the influence of helicopter descent velocity changes on the phenomenon of vortex ring state
    Autorzy:
    Grzegorczyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/102235.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    helicopter
    Vortex Ring State (VRS)
    vertical descent
    numerical analysis
    CFD
    Opis:
    The paper presents the results of a numerical aerodynamic analysis whose purpose was to determine the influence of the rate of descent on the vortex ring state (VRS). This phenomenon occurs for an appropriate combination of induced velocity and the velocity of the incoming airstream from the bottom. The rates of change of velocities delimit dangerous areas of flight. The simulations were performed using FLUENT software and the geometry of helicopter W-3 „Sokół”.
    Źródło:
    Advances in Science and Technology. Research Journal; 2013, 7, 17; 35-41
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Air flow analysis for electrical motors cooling system with Autodesk Simulation CFD 2013 program
    Autorzy:
    Madej, J.
    Będkowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/387310.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    gas and thermal flow analysis
    electrical motors
    cooling systems
    CFD
    maszyny elektryczne
    systemy chłodzące
    CFD analiza zjawisk przepływowych
    Opis:
    In the article the analysis of airflow through electrical motor was conducted and optimal design solution was chosen in order to increase cooling efficiency. Numerical simulations allow to determine the areas of temperature occurrence which may have destructive in-fluence on electrical motor parts and on its safe operation. The numerical calculations of airflow was carried out for two different types of fans as well as for two different housings. An analysis of the construction was carried out by CFD method using Autodesk Simulation CFD 2013. Community results of the analysis, we can conclude that the better solution for machines with fixed direction of rotation is to use in-stead of the radial the axial fan. For axial fan the motor temperature in the same condition was lower by about 5°C.
    Źródło:
    Acta Mechanica et Automatica; 2013, 7, 2; 89-92
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of the drag coefficient of a motorcycle helmet
    Autorzy:
    Czyż, Z.
    Karpiński, P.
    Sevdim, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/118113.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    numerical analysis
    CFD
    drag coefficient
    motorcycle helmets
    analiza numeryczna
    współczynnik oporu
    kaski motocyklowe
    Opis:
    The paper discusses a numerical investigation, using a CFD tool, ANSYS FLUENT, of drag acting on a motorcycle helmet. The simulations were performed on a model of a helmet downloaded from a free CAD model library. A solid model enabled us to generate a mesh, to define boundary conditions and to specify a model of turbulence. Accordingly, the values of forces acting on individual sections of the helmet were obtained and the coefficients of aerodynamic drag were calculated. The test results can be used to optimize the shape of the existing motorcycle helmet construction and to study the impact of generated drag forces on reaction forces affecting a motorcyclist’s body.
    Źródło:
    Applied Computer Science; 2018, 14, 1; 16-26
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow analysis within mechanical heart valve - medtronic hall - and validation of results by numerical modelling
    Autorzy:
    Moszkowski, T.
    Jaworek, M.
    Kostrzewa, B.
    Lalik, K.
    Darłak, M.
    Altyntsev, I.
    Kustosz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/333307.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    analiza przepływów
    sztuczna zastawka serca
    liczbowa analiza przepływu
    flow analysis within artificial heart valve
    numerical flow analysis
    CFD
    Opis:
    Research was conducted to analyze the flow of a fluid within mechanical heart valve - Medtronic Hall. Physical experiment and numerical modelling were performed. The aim of the research was to determine the difference between obtained experimental and numerical data. In the experiment a dependency between static flow rate within the valve and static inlet and outlet pressure in the valve duct was examined. Moreover a dependency between static flow rate and angular valve position was also determined. Experimental data was used to perform a numerical flow analysis. The obtained flow rate values and angular positions of the valve were set to a finite-volumes-method model in order to achieve model output pressure values identical or similar to the ones obtained from the experiment. The resulting pressure values from the experiment and numerical analyses proved to be of the same order of magnitude, varying only by up to 10%. However, as far as differential pressure is concerned, numerical results were out of the range of measurement resolution. It can be assumed that numerical flow analyses quite correctly predict the real phenomenon and in view of measurement inaccuracy of used sensors authors would suggest using more accurate ones and repeating measurements for future clarification.
    Źródło:
    Journal of Medical Informatics & Technologies; 2011, 17; 295-302
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The air flow influence on the drag force of a sports car
    Autorzy:
    Czyż, Zbigniew
    Karpiński, Paweł
    Gęca, Michał
    Diaz, Jacobo Ulibarrena
    Powiązania:
    https://bibliotekanauki.pl/articles/103127.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    numerical analysis
    CFD
    drag force
    car body
    sports car
    analiza numeryczna
    siła tarcia
    karoseria
    samochód sportowy
    Opis:
    The paper presents the numerical analysis of the drag force generated on the body of a sports car, based on the CFD method in the Ansys Fluent program. The three-dimensional model of the vehicle was taken from an open CAD database. Based on this, a computational grid was developed, boundary conditions and a turbulence model were defined. As a result of the calculations, the pressure distribution on the individual body parts and the velocity distribution in selected cross sections were obtained. In the next part of the research, the simulation results are used to optimize the shape of the bodywork of different passenger vehicles in order to reduce the generated drag force.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 2; 121-127
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    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
    Tytuł:
    Analiza konstrukcji modelowego eletrowibratora z magnesami trwałymi
    The structure analysis of the permanent magnets electro vibrator model
    Autorzy:
    Będkowski, Bartłomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/1857184.pdf
    Data publikacji:
    2021
    Wydawca:
    Wydawnictwo Druk-Art
    Tematy:
    MES
    CFD
    obliczenia mechaniczne
    obliczenia cieplne
    analiza modalna
    elektrowibrator
    FEM
    mechanical calculations
    thermal calculations
    modal analysis
    electro vibrator
    Opis:
    Praca prezentuje analizę konstrukcji modelowego elektrowibratora z magnesami trwałymi. Analiza została przeprowadzona na przygotowanych przestrzennych modelach obliczeniowych z wykorzystaniem narzędzi do obliczeń MES i CFD firmy Autodesk. W wyniku przeprowadzonych badań symulacyjnych określono trwałość łożyskowania, wytrzymałość wału, konstrukcji wirnika i kadłuba, wyznaczono częstości drgań własnych wirnika i kadłuba oraz przeprowadzono analizę termiczną maszyny. Wykonana analiza pozwoliła na ocenę nowej konstrukcji elektrowibratora na etapie modelu, przed wykonaniem rzeczywistej maszyny.
    The structure analysis of the permanent magnet electro vibrator model is presented in the work. The analysis was carried out on prepared spatial computational models using Autodesk’s MES and CFD calculation tools. As a result of the simulation tests, bearing durability, shaft, rotor and body structure strength, the rotor and body vibrations frequencies, and thermal analysis of the machine was carried out. The analysis made possible to evaluate the new design of the electro vibrator at the model stage before the actual machine was made.
    Źródło:
    Napędy i Sterowanie; 2021, 23, 7/8; 50-57
    1507-7764
    Pojawia się w:
    Napędy i Sterowanie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza konstrukcji modelowego eletrowibratora z magnesami trwałymi
    The structure analysis of the permanent magnets electro vibrator model
    Autorzy:
    Będkowski, Bartłomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/1857174.pdf
    Data publikacji:
    2021
    Wydawca:
    Wydawnictwo Druk-Art
    Tematy:
    MES
    CFD
    obliczenia mechaniczne
    obliczenia cieplne
    analiza modalna
    elektrowibrator
    FEM
    mechanical calculations
    thermal calculations
    modal analysis
    electro vibrator
    Opis:
    Praca prezentuje analizę konstrukcji modelowego elektrowibratora z magnesami trwałymi. Analiza została przeprowadzona na przygotowanych przestrzennych modelach obliczeniowych z wykorzystaniem narzędzi do obliczeń MES i CFD firmy Autodesk. W wyniku przeprowadzonych badań symulacyjnych określono trwałość łożyskowania, wytrzymałość wału, konstrukcji wirnika i kadłuba, wyznaczono częstości drgań własnych wirnika i kadłuba oraz przeprowadzono analizę termiczną maszyny. Wykonana analiza pozwoliła na ocenę nowej konstrukcji elektrowibratora na etapie modelu, przed wykonaniem rzeczywistej maszyny.
    The structure analysis of the permanent magnet electro vibrator model is presented in the work. The analysis was carried out on prepared spatial computational models using Autodesk’s MES and CFD calculation tools. As a result of the simulation tests, bearing durability, shaft, rotor and body structure strength, the rotor and body vibrations frequencies, and thermal analysis of the machine was carried out. The analysis made possible to evaluate the new design of the electro vibrator at the model stage before the actual machine was made.
    Źródło:
    Napędy i Sterowanie; 2021, 23, 7/8; 50-57
    1507-7764
    Pojawia się w:
    Napędy i Sterowanie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strength analysis of a large-size supporting structure for an offshore wind turbine
    Autorzy:
    Niklas, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/259468.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    renewable energy sources
    offshore wind power industry
    supporting structure
    strength analysis
    FEM
    computer simulation
    numerical calculations
    CFD
    conceptual design
    buckling
    thin-walled structure
    Opis:
    The offshore wind power industry is the branch of electric energy production from renewable sources which is most intensively developed in EU countries. At present, there is a tendency to install larger-power wind turbines at larger distances from the seashore, on relatively deep waters. Consequently, technological solutions for new supporting structures intended for deeper water regions are undergoing rapid development now. Various design types are proposed and analysed, starting from gravitational supports (GBS), through monopiles and 3D frame structures (jackets, tripods), and ending with floating and submerged supports anchored to the seabed by flexible connectors, including TLP type solutions. The article presents the results of examination of an untypical large-size gravitational support intended for waters with the depth of up to 40 m. Firstly, a general concept of the new design is presented, while the next basic part of the article describes the support design in detail and provides its strength analysis. The examined support has the form of a large steel container consisting of conical segments. The strength analysis was conducted using the finite element method (FEM), in accordance with the standard DNVGL-ST-0126. Modifications introduced to the most heavily loaded structural node of the support, which was the set of base bottom trusses, is also included. The results of the performed analysis prove that the presented concept of supporting structure for a 7MW turbine meets fundamental strength criteria. The nonlinear buckling analysis was performed to evaluate the critical force acting on the support, which turned out to be 1.44 times as large as the maximum load of the wind turbine. Potentially important issues for further analyses have been identified as those resulting from the asymmetry of basic loads acting on the support.
    Źródło:
    Polish Maritime Research; 2017, S 1; 156-165
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies