Publication detail

On stochastic inlet boundary condition for unsteady simulations

NIEDOBA, P. JÍCHA, M. ČERMÁK, L.

Original Title

On stochastic inlet boundary condition for unsteady simulations

Type

conference paper

Language

English

Original Abstract

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.

Keywords

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

Authors

NIEDOBA, P.; JÍCHA, M.; ČERMÁK, L.

RIV year

2013

Released

19. 11. 2013

Publisher

EDP Sciences

Location

Kutná Hora

ISBN

978-80-260-5375-0

Book

EPJ Web of Conferences

ISBN

2100-014X

Periodical

EPJ Web of Conferences

Year of study

67

Number

1

State

French Republic

Pages from

495

Pages to

498

Pages count

4

URL

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

Full text in the Digital Library

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"
}