Improved Schnerr-Sauer cavitation model for unsteady cavitating flow on NACA66

Abstract

For the purpose of comparing the capability for improved Schnerr-Sauer model, unsteady and turbulent cavitating flows over the three-dimensional NACA66 hydrofoil with fixed angle of attack of α=6° were numerically investigated based on Schnerr-Sauer (S-S) model and improved Schnerr-Sauer model, respectively. The SST k-ω model with local density correction was applied for the turbulence modeling and the effect of turbulence fluctuation was considered as well. Hydrodynamic coefficients, time-evolution of cloud cavity and the surface average pressure based on different cavitation models were obtained from simulations. in the stage of unsteady cavitation, the drag coefficient obtained from the improved S-S model close better with the value measured in experiment. The time-evolution of cloud cavity predicted by improved S-S model is much stronger and has better agreement with the experimental results as compared with the solution of S-S model.