Interaction between bubble near free surface and shock wave

Abstract

[Objectives] This paper presents research into the interaction between a free surface,shock wave and bubble.[Methods] Based on the Discontinuous Galerkin method and combined with the Level Set method and Real Ghost Fluid method,the characteristics of shock wave propagation and bubble motion are analyzed,the generation and evolution of waves in fluid fields are described in detail.[Results] The results show the presence of complex waves in the fluid field after the interaction,including multiple rarefaction waves and shock waves. The collapse speed of the bubble is slowed down with the existence of the free surface,while the shock wave of the incident accelerates the collapse speed of the bubble and increases the up warp motion of the free surface.[Conclusions] The conclusions drawn from this paper can be used as reference points for further research into the damage mechanisms of ship structures subjected to underwater explosions.

Keywords

• bubble
• free surface
• shock wave
• Discontinuous Galerkin method