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A POSSIBLE SOLUTION TO THE LES WALL-MODELING PROBLEM

Robert D. Moser
Department of Mechanical Engineerng and Institute for Computational Engineering and Sciences University of Texas at Austin 201 E 24th St, Austin, Texas 78712, USA

Arup Das
Department of Theoretical and Applied Mechanics University of Illinois, Urbana-Champaign Champaign, IL, 61801, USA

Abstrakt

In this paper, a possible solution to the long-standing problem of near-wall modeling in Large-Eddy Simulation (LES) is presented. There are two components to the approach. First, filtering with homogeneous filters is applied in all spatial directions, including the wall-normal direction. This has the effect of filtering the wall, and introduces an explicit wall term in the equations, which is modeled using a novel optimization technique. Second, an optimal LES model is used for the usual subgrid term in the interior of the flows. To test the validity of this approach, simulations were done with optimal LES models derived from DNS statistical data., with very good results. Research is ongoing to replace the DNS data with theoretical models.