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Cavitation is a dynamic phenomenon that occurs when underwater vehicles travel with such a high speed that the pressure around the vehicle surface decrease to the vapor saturation pressure of the liquid. High drag reduction could be achieved when the vehicle is entirely covered by the cavity which is defined as supercavitation. However,5 it is difficult to achieve supercavitation under natural conditions. Artificial supercavitation is one of the most prospective technique for underwater drag reduction, but it still faces some unsolved roadblocks, like cavity stability, noise, power etc. This article aims at investigating the instability of cavity with the strong jet impingement, and analyzing jet behavior in restricted space. A multiphase model using coupled VOF and level set method is adopted to capture the gas-liquid interface. By changing the position of jet nozzle exit and the jet intensity, a series of numerical simulation is performed. Firstly the transient evolution of the cavity interface under the effect of the high-speed jet is obtained. Numerical model is validated by comparing with the experimental data. Then the criterion to determine the transition between different jet/cavity interaction mechanisms is established based on a non-dimensional distance parameter. Furthermore, the entrainment mechanism inside the cavity is analyzed and provides useful insights on enhancing the cavity stability with strong jets.

Numerical Investigation and Analysis of the Unsteady Supercavity Flows with a Strong Gas Jet