Detail publikace

On stochastic inlet boundary condition for unsteady simulations

NIEDOBA, P. JÍCHA, M. ČERMÁK, L.

Originální název

On stochastic inlet boundary condition for unsteady simulations

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

computaional fluid dynamics, inlet boundary condition, synthesized turbulence, Fourier mode

Autoři

NIEDOBA, P.; JÍCHA, M.; ČERMÁK, L.

Rok RIV

2013

Vydáno

19. 11. 2013

Nakladatel

EDP Sciences

Místo

Kutná Hora

ISBN

978-80-260-5375-0

Kniha

EPJ Web of Conferences

ISSN

2100-014X

Periodikum

EPJ Web of Conferences

Ročník

67

Číslo

1

Stát

Francouzská republika

Strany od

495

Strany do

498

Strany počet

4

URL

https://www.epj-conferences.org/articles/epjconf/abs/2014/04/epjconf_efm-13_02082/epjconf_efm-13_02082.html

Plný text v Digitální knihovně

http://hdl.handle.net/11012/193663

BibTex

@inproceedings{BUT104111,
  author="Pavel {Niedoba} and Miroslav {Jícha} and Libor {Čermák}",
  title="On stochastic inlet boundary condition for unsteady simulations",
  booktitle="EPJ Web of Conferences",
  year="2013",
  journal="EPJ Web of Conferences",
  volume="67",
  number="1",
  pages="495--498",
  publisher="EDP Sciences",
  address="Kutná Hora",
  doi="10.1051/epjconf/20146702082",
  isbn="978-80-260-5375-0",
  issn="2100-014X",
  url="https://www.epj-conferences.org/articles/epjconf/abs/2014/04/epjconf_efm-13_02082/epjconf_efm-13_02082.html"
}