高速碰撞SPH方法模拟中的初始光滑长度和粒子间距  

Initial Smoothing Length and Space Between Particles in SPH Method for Numerical Simulation of High-speed Impacts

作　　者：徐金中[1] 汤文辉[1] 

机构地区：[1]国防科学技术大学理学院技术物理研究所,湖南长沙410073

出　　处：《计算物理》2009年第4期548-552,共5页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(10672180;10802097)资助项目

摘　　要：采用光滑粒子流体动力学方法对高速碰撞问题作数值模拟,分析初始光滑长度和非一致粒子间距对计算结果的影响,提出修正光滑长度法,并引入XSPH速度纠错公式.数值结果表明,初始光滑长度越大,弹丸的刚性越小,h0的合理取值范围应为d0<h0≤1.5d0;粒子间距越小,材料的刚性越小.非一致粒子间距和均匀粒子分布的计算结果吻合的较好.High-speed impact problems are simulated with smoothed particle hydrodynamics method. Initial smoothing length and nonconforming space between particles in simulation are analyzed. A modified smoothing length approach is put forward. With increase of initial smoothing length, projectile rigidity decreases gradually. A rational range of initial smoothing length is do 〈 h0 ~〈 1 .Sd0. With decrease of space between particles, rigidity of material decreases. With XSPH correction on velocity of a particle, results by nonconforming space between particles agree well with those from identical particle distribution.

关 键 词：高速碰撞 光滑粒子流体动力学 粒子间距 数值模拟 

分 类 号：O385[理学—流体力学]