Fluid–structure interactions between a near-field underwater explosion bubble and a suspended plate

Abstract

During near-field underwater explosions, the structural response induced by the shock wave and bubble load significantly affects the bubble collapse and jet characteristics. The effect of fluid–structure interaction (FSI) may increase the damage potential of the structure. In this study, we conduct experiments examining the interaction between small-charge underwater explosion bubbles and a suspended plate under different initial detonation distances. The morphological evolution of the bubble and the structural response are recorded using a high-speed camera and strain gauges, respectively. In addition, the bubble dynamic behaviors are simulated using the finite volume method, and an FSI model is established based on the overset mesh technology. The model is verified by comparisons between the experimental and numerical results. The physical mechanism affecting the bubble collapse pattern is revealed. The influence of the distance parameter γ between the bubble and the plate on the jet pattern and structure load is systematically studied. The findings presented in this study provide a reference for bubble-related fields and transient gas–liquid–structure interactions.