船舶在远场水下爆炸载荷作用下动态响应的数值计算方法

提出了一个利用MSC／DYTRAN数值模拟水面船舶在远距离水下爆炸载荷作用下动力响应的方法。用FORTRAN语言编译用户子程序，在近场水域边界处加上冲击波载荷以模拟远场爆炸效应，进而利用DYTRAN中强大的流固耦合计算功能，计算船体在水下冲击波作用下的动态响应。同时研究了边界定义和单元划分对冲击波传播的影响。该方法弥补了DYTRAN计算远场水下爆炸的某些不足，计算所得到的船体附近的自由场压力与经验公式的结果基本一致，船体的冲击响应与相关实验结果比较表明本文计算结果可信。

Numerical Analysis of Ship Dynamic Response due to Shock Waves Induced by Long-distance Underwater Explosion

In this paper, a numerical analysis method in DYTRAN to simulate the dynamic response of a ship subjected to shock waves induced by long distance underwater explosion is proposed. A blast load is applied on the boundary of water region near the ship with subroutine built by FORTRAN to simulate the effect of long distance underwater explosion, which made up the deficiency of DYTRAN. Furthermore, the dynamic response of the ship is obtained by the powerful fluid solid couple calculation capability in DYTRAN. The definition of the flow boundary, the water element mesh creation and the effect of them to the spread of shock wave induced by long distance underwater explosion are investigated.