Numerical study of pressure loads generated by a shock-induced bubble collapse

Eric Goncalves da Silva (1) , Philippe Parnaudeau (1)

1 PPrime [Poitiers] - Institut Pprime [UPR 3346]

This paper presents a numerical study of the strong loads caused by the collapse of an air bubble immersed in water at the vicinity of a wall and impacted by a normal shock wave. Simulations are performed using an efficient parallel fully compressible two-phase solver based on an homogeneous mixture model. Different configurations are investigated by varying the distance of the initial bubble to the wall. Comparisons are done with exiting results and with two-dimensional simulations highlighting large discrepancies on the computed pressure peaks. The computations show that the stand-off distance has significant effects on the collapse dynamics and the maximum wall pressure leading to potential wall damage. A power-law is proposed for the evolution of the maximum pressure peak as a function of the stand-off distance. Finally, a twin-bubble collapse is computed illustrating collective effects and the amplification of the pressure peak at the wall.

Mots clés: Bubble collapse; Induced damage; Compressible multiphase models; Shock waves; High performance computing

Domaines: Mécanique des fluides [physics.class-ph]

Eric Goncalves da Silva, Philippe Parnaudeau. Numerical study of pressure loads generated by a shock-induced bubble collapse. Physics of Fluids, 2021, 33, ⟨10.1063/5.0069332⟩. ⟨hal-03425903⟩