NUMERICAL PREDICTION OF CAVITATING FLOW AROUND A HYDROFOIL USING PANS AND IMPROVED SHEAR STRESS TRANSPORT K-OMEGA MODEL

The prediction accuracies of partially-averaged Navier-Stokes model and im-proved shear stress transport k-ω turbulence model for simulating the unsteady cavitating flow around the hydrofoil were discussed in this paper. Numerical re-sults show that the two turbulence models can effectively reproduce the cavitation evolution process. The numerical prediction for the cycle time of cavitation in-ception, development, detachment, and collapse agrees well with the experi-mental data. It is found that the vortex pair induced by the interaction between the re-entrant jet and mainstream is responsible for the instability of the cavita-tion shedding flow