Influence of the turbulence representation at the inlet on the downstream flow pattern in LES of backward-facing step
Loading...
Date
2012-04-09
Authors
Volavý, Jaroslav
Forman, Matěj
Jícha, Miroslav
ORCID
0000-0002-1409-5165Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
EDP Sciences
Altmetrics
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.
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.
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.
Description
Citation
EPJ Web of Conferences. 2012, vol. 25, issue 1, p. 485-489.
https://www.epj-conferences.org/articles/epjconf/abs/2012/07/epjconf_EFM2011_01099/epjconf_EFM2011_01099.html
https://www.epj-conferences.org/articles/epjconf/abs/2012/07/epjconf_EFM2011_01099/epjconf_EFM2011_01099.html
Document type
Peer-reviewed
Document version
Published version
Date of access to the full text
Language of document
en