高速碰撞数值计算中的SPH自适应粒子分布法

A new adaptive SPH method for hypervelocity impact simulation

1.
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, Anhui, China

摘要: 针对传统光滑粒子法在计算高速碰撞问题时会出现近邻粒子逸出核函数影响域而产生数值破坏这一缺陷，提出了一种根据粒子间距变化自动添加、合并粒子的SPH自适应粒子分布算法。采用该方法对Taylor碰撞和超高速碰撞问题进行了数值模拟，结果表明，该方法可以有效地消除计算中出现的数值破坏，提高计算精度。
- 固体力学 /
- 自适应粒子分布法 /
- 光滑粒子法 /
- 高速碰撞
Abstract: Numerical fracture induced by neighbor particles moving out of the influencing domain of the kernel function may occur in the numerical simulation of hypervelocity impact problems by the standard SPH method. A new adaptive SPH method by adding and merging particles according to the distance between particles was developed to eliminate the numerical fracture. Numerical simulations were carried out on the Taylor and hypervelocity impact samples. Simulated results display that the new adaptive SPH method can effectively eliminate the numerical fracture in the computation and remarkably improve the computational precision.
- solid mechanics /
- adaptive particle distribution /
- SPH /
- hypervelocity impact