Abstract: A set of simulation methods for high-speed (≥100 m/s) water-entry is developed for both cavitation and compressible effects in the numerical simulation of multi-phase flow at water-air interface. The revolutionary body is used as a computing model, and the turbulence models, including SST k-ω, Standard k-ε, RNG k-ε, and Realizable k-ε, are utilized for simulation. The change results of velocity damping and water-entry depth with time are obtained. The cavitation configuration at 1 ms is outlined. The simulated results are compared with the theoretical solutions, and the simulated results by SST k-ω agree with the theoretical solutions. The set of methods is used for the reference experiments in Refs. ［15］ and ［17］. Compared with experimental results, the set of methods is validated in terms of velocity damping and cavitation development. Some different water-entry velocities, including 50 m/s, 100 m/s, 200 m/s, 400 m/s and 800 m/s, are regarded as initial condition to be computed. The compressibility of water has no effect on the water-entry impact basically when water-entry velocity is less than 100 m/s. Beyond that, the compressibility of water has much effect on the water-entry impact, which can lessen the impact and delay the time of peak value. In addition, the cavitation configuration has shrunk, especially in the water-air area. With the increase in water-entry velocity, the velocity damping becomes quicker. The acceleration is relatively higher in the beginning of water-entry. During the period of the model covered by supercavitation, the acceleration gradually declines and changes gently with the increase in water-entry depth. Key

Key words: revolutionarybody, high-speedwater-entry, cavitationflow, compressiblewater