水下爆炸载荷数值模拟方法

Numerical simulaton method study of underwater explosion load

基于MSC-Dytran有限元软件,以水下爆炸载荷数值模拟的两类状态方程GAMA和JWL为讨论对象,通过大量数值试验,分析了欧拉网格密度、等效高压气团的初始半径、水的状态方程系数对水下爆炸载荷关键参数模拟效果的影响,给出使用GAMA状态方程时初始气泡半径的取值范围。提出采用JWL状态方程时,通过合理划分网格及提升水的状态方程系数技术模拟整个水下爆炸载荷过程的方法,该方法同时考虑了冲击波载荷和气泡脉动载荷,从而为研究近距水下爆炸载荷下结构响应提供较为准确地爆炸载荷,具有一定的工程意义和参考价值。

By using MSC-DYTRAN,choose two kinds of equation of GAMA and JWL state equation as research object,a large quantities of numerical tests are carried,the influence of eular mesh density and initial radius of bubble and the coefficient of state equation of water on the tipcal patameters of underwater explosion are discussed,the reasonable scope of initial radius of bubble is proposed,it is advised that the whole phase of the underwater explosion can simulated by appropriate mesh density and proper coefficient of state equation of water by using JWL stater equation,this method considered bubble load and shock wave load at the same time,which can be used for the response of ship applied by near field underwater explosion load.