网格划分影响二维爆炸冲击波数值模拟精度的研究

使用ANSYS／LS—DYNA建立了TNT炸药在空气中爆炸传播的二维计算模型，比较了相同网格划分比例时，三种不同当量TNT爆炸后在各自比例距离上测得的超压峰值．结果表明：各峰值基本相同，差别小于10^4Pa．在此基础上，改变网格划分比例，模拟计算5kg当量TNT的超压峰值，并与美国常规武器防护设计规范（TM5～855—1）进行对比，提出了与不同比例距离区间相适应的网格划分比例．

The Influence Research of the Mesh Size on the Numerical Simulation Accuracy of 2-D Blast Wave

A 2-D calculating model of blast wave spreading in the air is established by ANSYS/LS-DYNA, and the peak overpressure measured on several scale distances of three different kinds of equivalent weight are compared under the same mesh size. The result indicates that the differences of the peak overpressures are less than 10^4 Pa, which means they are basi- cally the same. Based on the above analysis, the authors changes the mesh size to simulate the peak overpressure of 5.00 kg equivalent weight of TNT, and compares it with the result of the code for design of the U.S.A. conventional weapons protec- tion （TM5-855-1）, the fundamentals of protective design for conventional weapons, and proposes different mesh generation methods to suit different scale distance zones.