Publication detail

Influence of the turbulence representation at the inlet on the downstream flow pattern in LES of backward-facing step

VOLAVÝ, J. FORMAN, M. JÍCHA, M.

Original Title

Influence of the turbulence representation at the inlet on the downstream flow pattern in LES of backward-facing step

English Title

Influence of the turbulence representation at the inlet on the downstream flow pattern in LES of backward-facing step

Type

conference paper

Language

en

Original Abstract

The impact of the choice of inlet boundary condition treatment on the fluid flow is studied in this work. The correct representation of the turbulence at the inlet to the domain is essential for the accuracy of Large Eddy Simulation. The inappropriate specification of the inlet velocity has significant effect on the downstream flow pattern. The case of backward-facing step was used as a test case. Three different approaches of the inlet boundary conditions were studied: uniform velocity profile, mean velocity profile of the fully developed channel flow and velocity obtained from mapping velocity from plane positioned behind the inlet back to the inlet. The results of the simulations were compared with experimental results. It has shown, that using uniform velocity profile on inlet and even prescribing turbulent mean velocity profile without proper representation of turbulence fluctuations leads to unrealistic results.

English abstract

The impact of the choice of inlet boundary condition treatment on the fluid flow is studied in this work. The correct representation of the turbulence at the inlet to the domain is essential for the accuracy of Large Eddy Simulation. The inappropriate specification of the inlet velocity has significant effect on the downstream flow pattern. The case of backward-facing step was used as a test case. Three different approaches of the inlet boundary conditions were studied: uniform velocity profile, mean velocity profile of the fully developed channel flow and velocity obtained from mapping velocity from plane positioned behind the inlet back to the inlet. The results of the simulations were compared with experimental results. It has shown, that using uniform velocity profile on inlet and even prescribing turbulent mean velocity profile without proper representation of turbulence fluctuations leads to unrealistic results.

Keywords

Large Eddy Simulation, backward facing step, inlet boundary condition

RIV year

2011

Released

09.04.2012

Publisher

EDP Sciences

ISBN

978-80-7372-784-0

Book

EPJ Web of Conferences

Pages from

485

Pages to

489

Pages count

5

URL

Full text in the Digital Library

BibTex


@inproceedings{BUT75193,
  author="Jaroslav {Volavý} and Matěj {Forman} and Miroslav {Jícha}",
  title="Influence of the turbulence representation at the inlet on the downstream flow pattern in LES of backward-facing step",
  annote="The impact of the choice of inlet boundary condition treatment on the fluid flow 
is studied in this work. The correct representation of the turbulence at the inlet to the domain is 
essential for the accuracy of Large Eddy Simulation. The inappropriate specification of the inlet velocity 
has significant effect on the downstream flow pattern. The case of backward-facing step was used as a test case.
Three different approaches of the inlet boundary conditions were studied: uniform velocity profile, mean velocity profile
of the fully developed channel flow and velocity obtained from mapping velocity from plane positioned behind the inlet 
back to the inlet. The results of the simulations were compared with experimental results. 
It has shown, that using uniform velocity profile
on inlet and even prescribing turbulent mean velocity profile without proper representation of turbulence 
fluctuations leads to unrealistic results.",
  address="EDP Sciences",
  booktitle="EPJ Web of Conferences",
  chapter="75193",
  doi="10.1051/epjconf/20122501099",
  howpublished="online",
  institution="EDP Sciences",
  number="1",
  year="2012",
  month="april",
  pages="485--489",
  publisher="EDP Sciences",
  type="conference paper"
}