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AN ANISOTROPIC DYNAMIC ONE EQUATION SUBGRID SCALE MODEL FOR LARGE EDDY SIMULATION

Rajani Kumar Akula
Chair of Energy and Powerplant Technology, TU-Darmstadt Petersenstr. 30, Darmstadt, Germany-64287

Amsini Sadiki
Institute of Energy and Power Plant Technology, Technische Universität Darmstadt, 64287 Darmstadt, Germany

Johannes Janicka
Institute of Energy and Power Plant Technology, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany; Darmstadt Graduate School of Excellence Energy Science and Engineering, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany

Abstrakt

The main aim of the present work is to develop a anisotropic one equation model based on the subgrid scale (SGS) kinetic energy for the large eddy simulation (LES) and test on a fully developed channel flow with constant spanwise rotation. The present model considers an anisotropic eddy viscosity formulation. The production term is then computed using the local coefficient by using dynamic procedure without any averaging restrictions or clipping. For the prediction of the correct asymptotic behavior near wall an additional modification to the dissipation term is introduced following the RANS low Reynolds number modeling. The proposed model is first tested on fully developed channel flow and compared with some existing models results. Second, efficiency of this model has been demonstrated by the prediction of re-laminarization of grid scale (GS) turbulence on the suction side of the spanwise rotating channel flow.