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Wyszukujesz frazę "unsteady interaction" wg kryterium: Temat


Wyświetlanie 1-3 z 3
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
Artykuł
Tytuł:
Unsteady flow simulation in hydraulic machinery
Autorzy:
Ruprecht, A.
Powiązania:
https://bibliotekanauki.pl/articles/1986686.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
unsteady RANS
parallel computing
hydro turbine
rotor-stator interaction
vortex rope
Opis:
In the field of hydraulic machinery Computational Fluid Dynamics (CFD) is routinely used today in research and development as well as in the daily design phase. Today in industry mostly steady state simulations are applied. In this paper, however, an overview of unsteady simulations is shown for different applications. The presented examples contain problems with self excited unsteadiness, vortex rope in the draft tube, as well as applications with externally forced unsteadiness by changing or moving geometries and rotor-stator interactions. For the shown applications the requirements, potential and limitations of unsteady flow analysis are assessed.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 1; 187-208
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation of the basilar membrane vibration induced by the unsteady fluid flow in the human inner ear
Autorzy:
Wahl, Philipp
Ziegler, Pascal
Eberhard, Peter
Powiązania:
https://bibliotekanauki.pl/articles/1845019.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
human cochlea
basilar membrane
unsteady viscous fluid flow
fluid-structure interaction
pressure-displacement-based fluid element
viscous boundary layer
tonotopy
auditory threshold
ludzki ślimak
membrana podstawna
niestabilny przepływ cieczy lepkiej
interakcja płyn-struktura
element hydrauliczny oparty na ciśnieniu wyporowym
lepka warstwa graniczna
tonotopia
próg słyszalności
Opis:
For a deeper understanding of the inner ear dynamics, a Finite-Element model of the human cochlea is developed. To describe the unsteady, viscous creeping flow of the liquid, a pressure-displacement-based Finite-Element formulation is used. This allows one to efficiently compute the basilar membrane vibrations resulting from the fluid-structure interaction leading to hearing nerve stimulation. The results show the formation of a traveling wave on the basilar membrane propagating with decreasing velocity towards the peaking at a frequency dependent position. This tonotopic behavior allows the brain to distinguish between sounds of different frequencies. Additionally, not only the middle ear, but also the transfer behavior of the cochlea contributes to the frequency dependence of the auditory threshold. Furthermore, the fluid velocity and pressure fields show the effect of viscous damping forces and allow us to deeper understand the formation of the pressure difference, responsible to excite the basilar membrane.
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 4; 381-414
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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