Adaptive solution techniques for simulating underwater explosions and implosions

Adaptive solution techniques are presented for simulating underwater explo-sions and implosions. The liquid is assumed to be an adiabatic fluid and the solution in the gas is assumed to be uniform in space. The solution in the water is integrated in time using a semi-implicit time discretization of the adiabatic Euler equations. Results are presented either using a non-conservative semi-implicit algo-rithm or a conservative semi-implicit algorithm. A semi-implicit algorithm allows one to compute with relatively large time steps compared to an explicit method. The interface solver is based on the coupled level set and volume-of-fluid method (CLSVOF) [19, 20]. Several underwater explosion and implosion test cases are presented to show the performances of our proposed techniques. Key Words: AMR; Semi-implicit; CLSVOF; Multi-phase; Under-water explo-sions and implosion