Research on flow field structure of ventilated supercavity around an axisymmetric body

To understand the flow field structure of ventilated supercavity, the ventilated cavity flows around an axisymmetric body are researched by the experimental and numerical methods. A filter-based turbulence model is applied to accurately capture the vortex separation in numerical simulations. The methods of Euler and Lagrangian Coherent Structures (LCS) are used to describe the flow field structure in the domain of ventilated supercavity. The results show that the numerical results are consistent with the experimental results. The air entrained from the ventilated hole transports along the air-water interface to the end of cavity. Some portions of air escape from the domain of cavity, while some portions of air flow into the domain of cavity by the reentrance. The air existing in the middle of ventilated cavity moves regularly and cannot escape from the cavity. Some portions of fluid in the rear of ventilated cavity escape from the cavity and form the shedding bubbles, while some portions of fluid vortically move in the cavity.