水下爆炸数值仿真

Numerical simulation of underwater explosion

基于MSC.Dytran软件,通过一维球对称数值仿真模型,模拟了水下爆炸冲击波传递以及第一次气泡脉动过程,其计算结果与经验公式计算结果吻合较好,在此基础上讨论了网格划分方式、网格密度以及计算区域大小对计算结果精度的影响。通过一维模型与三维模型数值计算结果的对比,论证了基于一维球对称数值仿真模型,通过Remap映射技术进行三维模型数值仿真的计算方法。该方法在保证计算精度的同时较大地提高了计算效率,具有较强的工程应用价值。

Using the software MSC Dytran, the shock wave＇s spread and the first bubble＇s impulse in underwater explosion were simulated by 1-D spherical symmetry numerical model. The results of numerical simulation were agreeable with the ones of experimental formulations. The factors influencing on the calculation results were compared and analyzed, such as the method of meshing, density of mesh and the range of the numerical model. Through comparing the calculation results of 1-D model with the ones of 3-D model, the calculation method of translating 1-D spherical symmetry model into 3-D model by Remap was proved out. The above method improved the efficiency of numerical simulation, and also ensured the necessary precision, so it was significant to the actual engineering problems.