SPH simulation on the behaviors of projectile water entry
- 1. School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
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Abstract: In this work we investigated the dynamic behaviors of the projectile water entry using the SPH method. We developed our own SPH program based on the N-S equation of the Lagrange form and established a calculation model for the projectile water entry and, with corresponding material parameters and equation of state given, studied the influence of such factors as projectile shape, velocity and angle into the water on the process of the projectile water entry. The simulation results show that the formation and the development of the cavitation bubble are mainly determined by the projectile's state of motion: the more stable the projectile's trajectory, the smaller its drag coefficient, and the greater its sustained velocity. It is found that the SPH method has a high self-adaptability, for which it is applicable for studying the problems related with fluid-structure interaction occurring during the process of the projectile water entry.