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LES Modeling of Converging Diverging Turbulent Channel Flow

type de publication      communication internationale avec actes publiés
date de publication 15-10-2009
auteur(s) Laval Jean-Philippe; Elsner Witold; Kuban Lukasz; Marquillie Matthieu
conférence Progress in Wall Turbulence: Understanding and Modeling
     dates de 21-04-2009 à 23-04-2009
     lieu Lille, France
     nom des actes Proceedings of the WALLTURB International Workshop held in Lille, France, April 21-23, 2009. M. Stanislas, J. Jimenez, I. Marusic Editors, ERCOFTAC Series vol. 14, Springer
pages 355 – 363
ISBN / ISSN 978-90-481-9602-9
résumé The paper presents the results of LES application for turbulent channel flow with varying pressure gradient obtained by the adequate curvature of one of the wall. The adverse pressure gradient in the second part of the channel together with a wall curvature results in small separation of the flow at that side. The main objective of the paper was an assessment of various subgrid models implemented in two different codes as well as the sensitivity of the predictive accuracy to grid resolution. The simulations were performed on a few levels of coarsening grids compared to the reference DNS. The influence of the grid refinement and constant parameters for the subgrid scale models were investigated. It was demonstrated that all subgrid scale models require a comparable minimum grid refinement in order to capture accurately the recirculation region.
mots clés Large Eddy Simulation, Turbulence
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