Behavior of Underwater Explosion Bubble

Behaviour of an underwater explosion bubble was studied in this paper. Study includes both model scale UNDEX tests and simulations. In the experimental part of the study charges with sizes from 0,5 g to 4,0 g were detonated in a test tank with free surface while detonation moment and water pressures were measured. In addition, behaviour of the gas bubble was filmed with two high-speed digital cameras. Cases corresponding the tests were modelled using Eulerian element formulation with Abaqus/Explicit software. Water and air were modelled with equation of state material models. An overpressure excitation was used for introducing the appropriate charge excitation. Geers-Hunter explosion model was used for calculating the initial pressure for the charge. Detonation products were also modelled by using ideal gas equation of state material model. Simulated pressure history, bubble oscillation, migration and radiuses were studied and compared to measurements and both empirical and Geers-Hunter explosion model results.