Analysis of bubble pulsation characteristics of underwater explosion with large buoyancy parameters near boundary conditions

Key Points

• This research aims to analyze how bubble pulsation characteristics vary during underwater explosions influenced by buoyancy parameters and boundary conditions.
• Developed EFEM numerical model for underwater explosion bubbles considering various bottom boundaries.
• Conducted oversized gravity field tests for 2500 kg TNT equivalent load in shallow water.
• Studied the impact of mud and rigid bottom boundaries on bubble pulsation and free surface coupling.
• Bubbles closer to the bottom exhibit longer first cycle pulsation time and greater pulsation pressure.
• The maximum growth rate of the main peak occurs at bottom distance γ_bb = 0.5, with increasing skirt width.
• Rigid boundary bubbles show peak pulsation pressure and growth rate higher than mud boundary under equal distance parameters.