On stochastic inlet boundary condition for unsteady simulations
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F13%3APU106797" target="_blank" >RIV/00216305:26210/13:PU106797 - isvavai.cz</a>
Výsledek na webu
<a href="http://dx.doi.org/10.1051/epjconf/20146702082" target="_blank" >http://dx.doi.org/10.1051/epjconf/20146702082</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/epjconf/20146702082" target="_blank" >10.1051/epjconf/20146702082</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
On stochastic inlet boundary condition for unsteady simulations
Popis výsledku v původním jazyce
The paper deals with the stochastic generation of synthesized turbulence, which may be used for a generating of an inlet boundary condition for unsteady simulations, e.g. Direct Numerical Simulation (DNS) or Large Eddy Simulation (LES). Assumptions for the generated turbulence are isotropy and homogeneity. The described method produces a stochastic turbulent velocity field using the synthesis of a finite sum of random Fourier modes. The calculation of individual Fourier modes is based on known energy spectrum of turbulent flow, and some turbulent quantities, e.g. turbulent kinetic energy and turbulent dissipation rate. A division of wave number range of the energy spectrum determines directly the number of Fourier modes, and has a direct impact on accuracy and speed of this calculation. Therefore, this work will examine the influence of the number of Fourier modes on a conservation of the first and second statistical moments of turbulent velocity components, which are prespecified. It is important to ensure a sufficient size of a computational domain, and a sufficient number of cells for meaningful comparative results. Dimensionless parameters characterizing the resolution and size of the computational domain according to a turbulent length scale will be introduced for this purpose. Subsequently, the sufficient values of this parameters will be shown for individual numbers of Fourier modes.
Název v anglickém jazyce
On stochastic inlet boundary condition for unsteady simulations
Popis výsledku anglicky
The paper deals with the stochastic generation of synthesized turbulence, which may be used for a generating of an inlet boundary condition for unsteady simulations, e.g. Direct Numerical Simulation (DNS) or Large Eddy Simulation (LES). Assumptions for the generated turbulence are isotropy and homogeneity. The described method produces a stochastic turbulent velocity field using the synthesis of a finite sum of random Fourier modes. The calculation of individual Fourier modes is based on known energy spectrum of turbulent flow, and some turbulent quantities, e.g. turbulent kinetic energy and turbulent dissipation rate. A division of wave number range of the energy spectrum determines directly the number of Fourier modes, and has a direct impact on accuracy and speed of this calculation. Therefore, this work will examine the influence of the number of Fourier modes on a conservation of the first and second statistical moments of turbulent velocity components, which are prespecified. It is important to ensure a sufficient size of a computational domain, and a sufficient number of cells for meaningful comparative results. Dimensionless parameters characterizing the resolution and size of the computational domain according to a turbulent length scale will be introduced for this purpose. Subsequently, the sufficient values of this parameters will be shown for individual numbers of Fourier modes.
Klasifikace
Druh
D - Stať ve sborníku
CEP obor
JR - Ostatní strojírenství
OECD FORD obor
—
Návaznosti výsledku
Projekt
<a href="/cs/project/GA13-27505S" target="_blank" >GA13-27505S: Bezsíťová metoda s Large Eddy Simulation pro dynamiku tekutin a výpočtová aeroakustika</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2013
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název statě ve sborníku
EPJ Web of Conferences
ISBN
978-80-260-5375-0
ISSN
2100-014X
e-ISSN
—
Počet stran výsledku
4
Strana od-do
495-498
Název nakladatele
Technical University of Liberec
Místo vydání
Kutná Hora
Místo konání akce
Kutná Hora
Datum konání akce
19. 11. 2013
Typ akce podle státní příslušnosti
WRD - Celosvětová akce
Kód UT WoS článku
000343672100085