Numerical Simulation Of Underwater Explosion

In order to improve the numerical simulation precision of underwater explosion in near-field, some parameters which have effect on the simulation, such as boundary condition, element density were analyzed. The feasibility of three-dimension numerical simulation of underwater explosion with limited computing condition was analyzed, for carrying out the next simulations effective in the thesis.By using LS-DYNA FEM software, the computational model of one-dimensional underwater cylindrical explosion was proposed and the underwater shock wave and bubble pulsation numerical simulations were done. Referring to charge deepness, the influence of shock wave and bubble pulsation were studied.By using AUTODYN dynamics program, the two-dimension numerical simulation of underwater explosion was proposed and the shock wave of underwater explosion was done. The characteristic parameters of shock wave such as pressure time histories, peak pressure and shock wave impulse and shock wave energy were dependable by comparing simulation results with empirical results. Referring to two priming methods, two charging structure, different materials of shell and different shell thickness, the influence of the characteristics parameters of shock wave were investigated.