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Issue ESAIM: Proc.
Volume 16, 2007
CEMRACS 2005 - Computational Aeroacoustics and Computational Fluid Dynamics in Turbulent Flows
Page(s) 89 - 113
DOI http://dx.doi.org/10.1051/proc:2007010
Published online 02 March 2007

ESAIM: Proc., 2007, Vol. 16, pp. 89-113
DOI: 10.1051/proc:2007010

Towards Hybrid LES-RANS-Coupling for Complex Flows with Separation

B. Jaffrézic1, M. Breuer1, O. Chikhaoui2, G. Deng2 and M. Visonneau2

1  Institute of Fluid Mechanics, University of Erlangen-Nürnberg, Cauerstr. 4, D-91058 Erlangen, Germany.
2  Ecole Centrale de Nantes, Laboratoire de Mécanique des Fluides CNRS UMR 6598, Nantes, France.

bjaffrez@lstm.uni-erlangen.de
breuer@lstm.uni-erlangen.de
Oussama.Chikhaoui@ec-nantes.fr
Ganbo.Deng@ec-nantes.fr
Michel.Visonneau@ec-nantes.fr

(Published online: 2 March 2007)

Abstract
The paper is concerned with a new hybrid LES-RANS approach, which splits up the simulation into a near-wall RANS part and an outer LES part, both modes relying on a one-equation model for the turbulent kinetic energy. This model has been tested on the standard plane channel flow test case as well as on the flow over a periodic arrangement of hills. Encouraging results were achieved. In an additional study based on the detached-eddy simulation (DES) concept attempts have been made to improve the accuracy of the simulation by using adaptive local grid refinement. For this purpose, a criterion based on the residual of the budget of the mean momentum equations has been studied.


Key words: Hybrid LES-RANS, Interface and Interface Criteria, Modeled and Resolved Scales, DES, Grid Refinement, Momemtum Budget


© EDP Sciences, ESAIM 2007


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