Evaluation of the filter-based turbulence model (FBM) for computation of unsteady ventilated-supercavitating flows

In order to investigate the flow model for the ventilated-supercavitating flows, the filter-based turbulent model (FBM) is introduced to a commercial software. The ventilated-cavitation flows around a disc cavitator are numerically simulated by using the software with FBM and the standard k-ε turbulent model respectively. Comparison with experimental results shows that there is obvious effects on the numerical results for the turbulent models. The high eddy viscosity predicted by the standard k-ε turbulent model dampens the vortex shedding motion and excessively attenuates the cavitation instabilities. FBM turbulent model can capture the unsteady bubble shedding structure, since the model simulates the eddy viscosity more accurately.