基于AUTODYN的水下爆炸冲击波模拟研究

Numerical study of underwater explosion shock wave based on AUTODYN

为提高水下爆炸冲击波的模拟精度,基于AUTODYN程序,采用数值模拟和实验研究相结合的方法,研究了网格密度、状态方程等对数值模拟结果的影响。发现要同时获得较好精度的压力和冲量模拟结果需要设置较高的网格密度;而状态方程的不同也有影响,计算结果表明,相对于多项式状态方程,SHOCK状态方程模拟中远场冲击波时更为准确。基于上述研究结果,通过设置较高的网格密度并利用SHOCK状态方程模拟了实验室小水池水下爆炸的冲击波传播情况,发现无论是峰值压力还是压力衰减趋势的模拟结果都和实验相符,说明了AUTODYN模拟冲击波传播的精确性。

For improving the precision of the numerical simulation of underwater shock wave,some parameters which may affect the simulation, such as equation of state （EOS） and element density, were studied based on numerical simulation with AUTODYN program and experiment in a small pool. The simulation results show that a high element density is needed to get a good accuracy both in pressure and impulse simulation,and we also find that the equation of state also has an effect on the simulation result,the study shows that SHOCK EOS of water is better than polynomial EOS in the simulation of pressure in far field. Finally,based on the above study results,we simulate the propagation of shock wave in small experiment pool with a high element density,and a SHOCK EOS of water. Both the numerical peak value and numerical decaying course of pressure are consistent with the experiment data, which show that AUTODYN have a capable in simulating the shock wave.