Jet characteristics of the three-dimensional explosion bubble in a compressible fluid

Abstract

In this study, a three-dimensional model for underwater explosion bubble dynamics is established using a weakly compressible theory implemented in the boundary integral method. To validate its accuracy and reliability, we compare the model's results with theoretical solutions, an axisymmetric model, and experimental data. First, we systematically study the jet characteristics of an underwater explosion bubble in the free field and reveal the power laws for the height, width, and velocity of the liquid jet of the bubble with respect to the buoyancy parameter δ. It is important to note that, in addition to δ, the strength parameter ε also plays a significant role in determining the height of the jet, particularly when δ≲ 0.3. Furthermore, we investigate the impact of an inclined wall on jet features and provide an analytical expression for the jet angle for bubbles near a vertical wall, utilizing the Kelvin impulse theory.