基于SPH方法的水下爆炸初始爆轰过程研究

炸药的水下爆炸具有极大的变形和高度的非均匀特性，基于网格的数值模拟方法研究这类问题时遇到诸多困难，将最近发展起来的无网格的光滑粒子流体动力学(SPH)应用到炸药的水下爆炸初始爆轰过程的研究。从模拟结果可知，应用SPH方法能较好地预测出爆轰波的大小和形状以及在爆轰过程中的压力分布。SPH方法非常适宜处理炸药的水下爆炸极短瞬时所具有的大变形和高度的非均匀动力学的极端情形，这对进一步模拟水下爆炸过程提供了一种新的研究方法。

Study on Initial Detonation Process of Underwater Explosion Using Smoothed Particle Hydrodynamics Method

The extreme transient of underwater explosion possesses dynamically extreme characteristics with extremely large deformation and large in homogeneity，which bring a lot of dificulties to the investigation using conventionally grid-based numerical simulation methods． A mesh free smoothed particle hydrodynamics(SPH)method is applied to simulate the detonation process of underwater explosion．The simulation results show that SPH method can give a very good prediction for both the magnitude and the shape of the detonation waves as well as the pressure distributions in the detonation process．Consequently，the SPH method is suitable for solving problems with dynamically extreme characteristics with extremely large deformation and large in homogeneity of underwater explosion，and it provides a new method for further numerical simulation of underw ater explosion．