Numerical Modeling of Unsteady Cloud Cavitation around a Clark-Y Hydrofoil Based on Modified SST Model

摘要

A density correction function was introduced into SST (shear stress transport) model in CFX by user defined subroutine. The unsteady cloud cavitation around a Clark-y hydrofoil was numerically simulated using the modified SST model, associated with Zwart cavitation model. The quasi-periodic evolution of cloud cavity and lift coefficient variation were analysed. The results compared with experimental data show that the modified SST model reduces turbulent viscosity in the rear part of cavity and the reentrant jet in cloud cavitation is predicted. The quasi-periodic evolution of cavity generation, development and collapse is captured accurately and the calculated lift coefficient curve is consistent with the experimental date. It can be concluded that the modified SST model used in this paper has a good applicability in the unsteady cloud cavitation simulation.