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Refinement of a hybrid LES−URANS approach for non-equilibrium turbulent flows

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.380
pages 341-352

M. Breuer
Professur fur Stromungsmechanik (PfS), Helmut−Schmidt−Universitat Hamburg, Holstenhofweg 85, D-22043 Hamburg, Germany

S. Schmidt
Professur fur Stromungsmechanik (PfS), Helmut−Schmidt−Universitat Hamburg, Holstenhofweg 85, D-22043 Hamburg, Germany

Resumo

The paper is concerned with a hybrid LES−URANS method. An explicit algebraic Reynolds stress model for the near−wall region is dynamically coupled with a one−equation subgrid−scale model for the outer LES region. Recently, the model for the dissipation close to the wall was refined by splitting the dissipation rate into a homogeneous and an inhomogeneous part and expressing both terms by exact formulations. The improved model is applied to different test cases including non−equilibrium turbulent flows with separations, e.g., the periodic hill flow and the flow in two 3−D diffusers.

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