基于SPH方法的水下接触爆炸数值模拟

Numerical simulation of underwater contact explosion based on SPH

水下爆炸涉及的物理现象极其复杂,特别是水下接触爆炸数值模拟极为困难。文章编制了基于体积近似的修正SPH方法计算程序,成功模拟了水下接触爆炸冲击波传播和结构破坏的整个过程。文中通过模拟圆柱形装药对水中结构的破坏,发现了钢结构的破坏模式、背空钢板处冲击波的传播特性。结果表明,修正SPH方法在高密度比介质的交界面处仍能反映基本的物理过程,在解决高速、强压缩和高密度比的多相流问题时具有较大优势。该文计算结果旨在为舰船水下接触爆炸相关研究提供参考。

The physical phenomena of underwater explosion are extremely complex, especially numerical simulation of underwater contact explosion is very difficult. The corrected SPH（Smoothed Particle Hydrodynamics） program based on volume approximation is developed in this paper, and the processes of shock wave propagation and structural damage under impact are simulated successfully. Through the simulation of cylindrical charge which destroys the structure in water, the failure mode of steel structures and the characteristics of shock wave propagation of plate back empty are found. The results show that the corrected SPH method at the interface of high density ratio still reflects the basic physical processes, and has great advantages of solving underwater contact explosion problem of high-speed, high-density ratio. This paper can provide a reference of warship underwater contact explosion.