ABSTRACT
An underwater explosion (UNDEX) is a complex phenomenon which comprises the generation of a shock wave along with the bubble pulsation after the detonation of the charge. An underwater explosion is much more destructive as compared to an air explosion due to the fact that in water, the transmission of the shock wave occurs easily as the molecules of water are closely packed compared to air. In this study, numerical analysis is performed on a mild steel water tank filled with water up to an assumed depth. The explosion is simulated inside the tank and the charge is placed at a certain depth inside the water. The underwater explosion is carried out using TNT as the explosive charge and this process is simulated using ABAQUS/Explicit wherein the Jones-Wilkens-Lee (JWL) equation of state and coupled Eulerian-Lagrangian (CEL) approach are applied. The study is focused on the gas bubble formation during the underwater explosion process. The initial bubble generated during the underwater explosion is observed and the study of pressure contorting on the wall of the water tank is studied.
