高速碰撞数值计算中的SPH分区算法  

Numerical Simulation of Hypervelocity Impact with Subdomains in SPH Computation

作　　者：卞梁[1] 王肖钧[1] 章杰[1] 赵凯[1] 

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230027

出　　处：《计算物理》2011年第2期207-212,共6页Chinese Journal of Computational Physics

基　　金：国家自然科学基金重点项目(10632080);国家自然科学基金(50802092)资助项目

摘　　要：针对高速碰撞问题大变形局部化的特点,提出一种分区计算的光滑粒子法.将整个计算域划分为若干子域,在可能发生大变形的子域布置较多的粒子,其它子域布置较少的粒子.分析子域交界面上产生计算不稳定的原因并提出解决方案.采用该方法对长杆弹侵彻厚靶板问题进行数值模拟,并与传统方法进行对比.结果表明,分区算法在保证计算精度的前提下,能显著提高光滑粒子法的计算效率.Considering the fact that large deviatoric deformations are always localized in a small narrow region in hypervelocity impact problems,a method named subdomain computation for SPH（smoothed particle hydrodynamics） is developed.The entire computational domain is divided into several subdomains.In subdomains where large deformation is developed more particles are placed,and in subdomains where only small deformation is developed fewer particles are placed.Computational instability induced at interface of two subdomains is discussed and a method to handle the instability is proposed.Numerical simulations of a rod projectile penetrating into a thick target are carried out with the method and traditional SPH.It shows that computation accuracy as well as computation efficiency are improved.

关 键 词：固体力学 分区算法 光滑粒子法 高速碰撞 

分 类 号：O302[理学—力学]