Numerical Analysis of Dynamic Response of Ship Models Subjected to Underwater Explosion

Dynamic acceleration and velocity responses of a ship model to non-contact underwater explosion are numerically analyzed and verified with experimental results in real application environment. The ship section is simulated by S4R four-node thin-shell elements and the fluid, sea water, is meshed by AC3D4 acoustic elements. The coupling between the structure and the fluid is reinforced by using the tie constraint method. The study shows that for acceleration response, numerical simulation is in good agreement with experimental tests within 6 ms; while for velocity response, a small alpha factor can significantly reduce the later time response and make the trend agree well with experimental results. element analysis.