摘要
利用物质点法求解三维远场水下爆炸冲击响应问题时,爆炸冲击波到达结构物之前传播过程的计算会消耗大量的计算资源,影响求解效率。针对这一问题,并考虑到水下爆炸冲击波在自由场中的传播特点,提出了一维球对称形式的物质点法,对球形炸药水下爆炸过程进行了数值模拟,并与Cole公式以及DYNA计算结果进行了比较,结果吻合较好,验证了一维球对称形式物质点法的正确性。在此基础上,提出了基于物质点法的重映射算法,将爆炸冲击波在自由场中的传播过程在一维球对称模型中进行计算,并将计算结果映射到三维模型中,以便继续完成计算过程,有效避免了计算资源在冲击波传播过程计算上的消耗。
In solving the shock response problems of three-dimensional far-field underwater explosion by the material point method, the calculation of the propagation process of the shock wave before it reaches the structure will cost a large amount of computing resources and affect the computing effi- ciency. Aimed to this problem, a one-dimensional spherically-symmetric form of the material point method was proposed by taking into account the propagation characteristics of the underwater explo- sion shock waves in the free field. And the underwater explosion of the spherical explosive was nu- merically simulated by the proposed material point method. The simulated results are in good agree- ment with the ones obtained by the Cole formula and DYNA, and it can explain that the proposed ma- terial point method is feasible. On the basis of the above results, a re-mapping algorithm was brought forward based on the material point method. The blast wave propagation in the free field was calculated in the one-dimensional spherically-symmetric model, and the calculated results were mapped to the three-dimensional model to complete the calculation process. So the computation efficiency is improved greatly.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2013年第5期494-500,共7页
Explosion and Shock Waves
基金
国家自然科学基金项目(11372080)
中央高校基本科研业务费项目(HEUCFZ1126)
燃烧与爆炸技术重点实验室基金项目(9140C350406130C35126)~~
关键词
爆炸力学
重映射算法
球对称物质点法
水下爆炸
mechanics of explosion
re-mapping algorithm
spherically-symmetric material point method
underwater explosion
作者简介
陈卫东（1966－），男，博士，教授，博士生导师。
