EFFECT OF TURBULENT VISCOSITY MODEL ON THE NUMERICAL SIMULATION OF CAVITATING FLOW IN HOT WATER

Abstract

In this study, the effect of different turbulent viscosity models on the numerical simulation of cavitating flow in hot water is investigated. The flow field around the NACA0015 hydrofoil is simulated using the compressible homogeneous water-vapor two-phase flow model. Three turbulent viscous models are performed, including compressibility model, Rebound modification model, and VLES model. The simulations are conducted with water at the temperatures of 25^oC, 50^oC and 70^oC and the two attack angles of 5^o and 8^o, respectively. The simulation results are compared quantitatively with the measured data of pressure coeficient -C_p by Cervone et al. at two cavitation numbers of s = 2.5 and 1.5. As the result, the cavity volume and turbulent kinetic energy around the hydrofoil is highly influenced by the turbulent viscosity model. A good match with measured data of the pressure coefficient C_p produced by all turbulent viscous model. For which the best satisfactory prediction with experimental data was achieved by  the compressibility model at all tested temperatures.