Numerical Simulation Of Bubble Pulsation Produced By Underwater Explosion

This paper in the foundation of theoretical analysis, has conducted the numerical simulation research to the bubble pulsation produced by underwater explosion, simulated the shock-wave dissemination and the bubble pulsation process.By using AUTODYN dynamics program establishment one-dimensional computation model, carried on the numerical simulation of bubble pulsation of 1kg sphere TNT charge detonated at submarine 10 meters, the numerical simulation value of shock-wave peak pressure and the first bubble pulsation period are in good agreement with the empirical formula value.By using AUTODYN dynamics program establishment two-dimensional axial symmetry computation model, carried on the numerical simulation of bubble pulsation of 12 g sphere TNT charge detonated at submarine 10 meters, the numerical simulation value of shock-wave peak pressure and the first bubble pulsation period are in good agreement with the empirical formula value.And the water jet flow forming process is analyzed;Combined with the high-speed photography experiment of underwater explosion, the numerical simulation research of bubble pulsation process of 1.5 g,3.0 g,4.5 g cylindrical PENT charge underwater explosion has conducted, and discussed the influence of grid division, the boundary condition to the bubble pulsation period and the bubble radius.Analyzed the relations between the bubble inflation speed and the charge weight, the shot depth has in the bubble pulsation process the water jet flow forming process, as well as along with the shot depth, the weight increases,the change tendency of the injection velocity;conducted the numerical simulation research of 1.45 g the sphere TNT blasting explosive near water surface underwater explosion bubble pulsation process, nearby the submarine structure underwater explosion bubble pulsation process, has discussed the influence of the free surface, the submarine structure and so on to the bubble pulsation period, the bubble inflation radius as well as the bubble shape, has confirmed the related empirical formula applicable scope, and has analyzed in the bubble pulsation process the water jet flow forming process.