Numerical modeling and investigation of the effect of internal waves on the dynamic behavior of an asymmetric ventilated supercavity

Abstract

In this paper, a realizable two-layer k−ε turbulence model and the Schnerr-Sauer cavitation model are used to simulate dynamic behavior of asymmetric ventilated supercavies while considering the effects of internal wave s. The effectiveness of the numerical method is verified via comparison with the available experimental data and the analytical solution of the internal wave velocity. The results show that the presence of internal waves affects the supercavity closure patterns and shedding periods. Compared to a system with no internal waves, the cavity shedding and pressure pulsation intensity increase and the shedding period is closely related to that of the internal wave. Internal waves also play an important role in the distribution of ventilated cavitation patterns inside the cavity. The local cavitation number is shown to reflect the pressure change during cavity evolution and indicates that the internal wave affects the flow field inside the cavity. In addition, the effects of internal waves of various amplitudes on cavitator hydrodynamic performance are studied. As the internal wave amplitude increases, the cavity pulsation evolution becomes more intense. Furthermore, the ventilated cavity intensity, lift, and drag are closely related to the amplitude of internal waves.