高能炸药爆轰过程的广义插值物质点法模拟  

Explosion simulation of high explosive materials using the generalized interpolation material point(GIMP) method

作　　者：陈卫东[1] 杨文淼[1] 

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2012年第9期1110-1115,共6页Journal of Harbin Engineering University

基　　金：中央高校基本科研业务费基金资助项目(HEUCFZ1126)

摘　　要：针对运用标准物质点法(MPM)对高能炸药爆轰过程进行数值模拟时,由于跨网格误差的存在,求解精度较低,计算稳定性较差等不足,将一种新算法——广义插值物质点法(GIMP)扩展到此类问题的数值模拟中.爆轰气体采用无粘性流体模型来描述,并假设整个爆轰过程是绝热的,建立了欧拉形式的控制方程.高能炸药选用TNT,并采用JWL状态方程进行描述.采用GIMP方法分别对一维板条TNT爆轰和二维聚能装药爆轰进行了数值计算,给出了TNT板条起爆后几个典型时刻的密度、内能和压力分布曲线以及聚能装药爆轰过程中速度矢量图和压力分布云图,成功捕获了聚能装药爆轰过程中的主要物理特征.数值计算结果表明,GIMP比标准MPM在计算精度以及稳定性上都有很大的提高,能够很好地模拟高能炸药的爆轰过程.Due to the errors caused by a particle crossing the grid boundary, the solution accuracy is low and the calculation stability is poor when using the standard material point method （MPM） to simulate explosions of high explosive materials. A new method, known as the generalized interpolation material point （GIMP） method, was applied to simulate the HE explosion. Assuming that the gaseous products are inviscid and the explosion process is adiabatic, the governing equations with the Euler form were established. The JWL equation of state is chosen to de- scribe the TNT. The examples of one-dimensional TNT slab detonation and two-dimensional shaped tion were numerically simulated using the GIMP. At some typical moments, the density, internal sure distribution after initiation of the TNT slab detonation and the speed vector chart and pressure during the shaped charge detonation were given. The main physical characteristics of the shaped charge detona- energy and pres- distribution chart charge detonation process were captured successfully. Numerical results show that the GIMP has greatly improved accuracy and stabil- ity compared to the standard MPM and can simulate explosions of high explosive materials well.

关 键 词：物质点法 广义插值物质点法 高能炸药爆轰 数值模拟 

分 类 号：O389[理学—流体力学]