LS-DYNA软件开展爆炸冲击波计算时需考虑的问题

Several Considerations When Calcutating the Blast Wave Using LS-DYNA

针对LS-DYNA软件模拟空气中爆炸冲击波的传播过程时边界条件设置对计算结果的影响,验证了采用部分建模的方法对具有对称性的模型进行数值模拟的可行性;研究了无反射边界面对冲击波超压值的影响;提出把计算区域厚度与炸药厚度之比d作为判断三维模拟时模型厚度合理性的标准,并指出在进行冲击波三维数值模拟时d应大于2。

Boundary conditions have great effects on numerical results when LS-DYNA is used in simulating the blast wave.The practicability of using the part model instead of the whole model is verified in this paper.The influence of the non-reflecting boundary on overpressure is analyzed.The ratio of the calculation area thickness and the explosive thickness,which is named d,is appointed as a standard to j udge whether the calculation area thickness is reasonable.And the value of d should be more than 2 when three-dimensional calculation is carried out.