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CASE STUDY OF A HYBRID LES / RAS APPROACH UTILIZING TURBULENCE RECYCLING

As hybrid large-eddy/Reynolds-averaged simulations become the preferred tool for simulating high-speed unsteady flows, validation of the approach and its extensions will become increasingly important. As part of this necessary validation campaign, simulations of a supersonic recessed-cavity flow are performed using a hybrid large-eddy/Reynolds-averaged simulation approach in conjunction with a turbulence recycling procedure. Calorically perfect air enters the three-dimensional domain at a freestream Mach number of 2.92. Analysis of the turbulent boundary layer above the rearward-facing step indicates excellent agreement with theoretical predictions. Mean velocity and pressure results are compared against Reynoldsaveraged simulation results and against experimental data. These comparisons indicate a significant improvement in the prediction of mean properties when using the hybrid approach with turbulence recycling and strong agreement with experimental results.