Thermodynamic effect on attached cavitation and cavitation-turbulence interaction around a hydrofoil

Abstract

This paper aims to numerically investigate the thermodynamic effect on attached cavitation and cavitation-vortex interaction around a NACA0015 hydrofoil. Based on the isothermal cavitation model, the compressibility and thermodynamic effect are considered by adding the state equation and modifying the evaporation and condensation source term in the mass transport equation. The thermodynamic effect on the hydrodynamic performance and the cavity volume fluctuations, the temporal evolution of the unsteady cavitation, the temporal evolution of vortex structures in the hydrofoil wake, and the cavitation-vortex interaction are presented. The main features of the unsteady quasi-periodic cavitation behavior are illustrated for the isothermal and non-isothermal conditions. The new omega vortex identification method depicts the influence of the thermodynamic effect on the shedding structure around the wake of a hydrofoil. Furthermore, the cavitation-vortex interaction is examined to show the relationship.