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LARGE-EDDY SIMULATION OF A PSEUDO-SHOCK SYSTEM IN A LAVAL NOZZLE

J.F. Quaatz
Institute of Aerodynamics and Fluid Mechanics Technische Universitat Munchen Boltzmannstrasse 15, 85748 Garching b. Munchen, Germany

M. Giglmaier
Institute of Aerodynamics and Fluid Mechanics Technische Universitat Munchen Boltzmannstrasse 15, 85748 Garching b. Munchen, Germany

Stefan Hickel
Institute of Aerodynamics and Fluid Mechanics Technische Universitat Munchen Boltzmannstr. 15, 85748 Garching bei Munchen, Germany; Chair of Computational Aerodynamics Faculty of Aerospace Engineering, TU Delft Kluyverweg 1, 2629 HS Delft, Netherlands

Nikolaus A. Adams
Chair of Aerodynamics and Fluid Mechanics, Department of Mechanical Engineering, Technical University of Munich, 85748 Garching bei München, Germany

Résumé

We present a high fidelity Large-Eddy Simulation (LES) of a pseudo-shock system in the divergent part of a Laval nozzle with rectangular cross section. The parallel side walls are taken into account, all wall boundary layers are well resolved and no wall model is used. For the first time it was possible to perform a wall-resolved LES for the same parameter set of a reference experiment. The results are validated against experimental wall-pressure measurements and schlieren pictures. Detailed insight into the complex 3-D flow phenomena including corner vortices and recirculation zones is presented. Differences between our LES and RANS simulations are discussed.