水下爆炸冲击载荷的一种新型算法研究

A New Approach to the Calculation of Impulsive Load of Underwater Explosion

近年来,越来越多的研究者都重视使用计算机的数值模拟对水下爆炸进行研究。水下爆炸包含了一系列复杂的物理过程,如大变形、高度非均匀性、可变形边界和自由表面。对于传统的基于网格的数值方法,水下爆炸问题的模拟是一项非常具有挑战性的工作。介绍了无网格光滑粒子流体动力学(SPH)方法在水下爆炸模拟中的应用,并且提出了处理固壁和物质交界面的算法,给出了水下爆炸过程具有代表性瞬间的压力分布、速度分布以及气泡的演变和脉动,为舰船水下爆炸冲击载荷的计算提供了一种新型有效的研究方法。

Recently, more and more researches of underwater explosion of warships are focused on the numerical simulations by using computers. Underwater explosion consists of complicated sequence of physical processes, and involves large deformation, large inhomogeneities, moving interfaces and free surfaces. Simulation of underwater explosion problems is a big challenge for the conventional grid-based numerical methods. This paper presents the application of the meshfree smoothed particle hydrodynamics （SPH） method to simulate underwater explosion of warships. And methods are proposed to treat the wall and material interface. Simulation results show the pressure distribution, velocity distribution and the gas bubble evolution and pulsation at representative instants in the underwater explosion process. A new and effective method is provided for research of impulsive load of underwater explosion of warships.