This paper presents an assessment of Partially Averaged Navier Stokes (PANS) model in transonic separated turbulent flow simulations. The two-equation k-ε based PANS models are implemented in a full 3-D Navier-Stokes solver and numerical results are obtained for transonic flow solution over an open cavity using a 3rd order Roe scheme. Results for the vorticity, pressure fluctuations, SPL (Sound Pressure level) spectra and for resolved TKE (Turbulent Kinetic Energy) are presented and compared with available experimental data and LES results. The effect of the PANS model variable fk (unresolved kinetic energy parameter) on the flow and acoustic field of the cavity is also analyzed. Computed results show that the predicted dominant frequency and the peak amplitude in the SPL spectra are influenced by the model constant.

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