Performance evaluation of turbulence models for complex flows in Sajben diffuser

Eight turbulence models were employed in the detailed numerical investigations for transonic flows in the Sajben diffuser, so as to assess the predictive capabilities of the turbulence models for shock-wave/turbulent boundary layer interactions in internal flows, including the Spalart-Allmaras model, the standard k-ε model, the RNG(re-normalization group) k-ε model, the realizable k-ε model, the standard k-ω model, the SST (shear stress transport) k-ω model, the v2-f model, and the Reynolds stress model. The performance of these different turbulence models was systematically assessed by comparing the numerical results with the available experimental data. The v2-f model and the SST k-ω model performed much better than other models, and the SST k-ω model predicted a little better than the v2-f model for pressure on walls, while v2-f model predicted a little better than the SST k-ω model for separation location, reattachment location and separation length in strong shock case.