Hybrid RANS-LES Modeling for Cavity Aeroacoutics Predictions

A new hybrid RANS-LES turbulence modeling approach suited for modeling cavity aeroacoustics is presented. The model combines a one-equation LES subgrid model and a two equation RANS turbulence model in a physically consistent manner. The model takes into account the extent of resolution of the flow features by the mesh and computes an eddy viscosity for the turbulence model to reflect this resolution. It is shown that the model replicates the behavior of the underlying RANS and LES models in the coarse and fine mesh limits, respectively. Predictions of a surface pressures due to a supersonic flow over a cavity are compared with experimental measurements to demonstrate the model capabilities.

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