Dynamic Characteristics of Underwater Explosion Bubble near Rigid Cylinder

To study the dynamic characteristics of underwater explosion bubbles near a rigid cylinder, a numerical model was established based on the Navier-Stokes equation combined with the volume of fluid method (VOF) to capture the gas-liquid two-phase interface, Using capacitor discharge to generate underwater explosion bubbles and using a high-speed camera to record the pulsation of the bubbles, some experiments were carried out. The experimental results were compared with the numerical simulation results to verify the validity of the numerical model. The numerical simulation results provide detailed information of the flow field of the interaction between the bubble and the rigid cylinder. The results show that the bubble pulsates near the rigid cylinder can make the fluid medium on the surface of the rigid cylinder form a velocity gradient, and the fluid layer with higher velocity can make the bubble form different bubble shapes. Finally, a dimensionless parameter was defined to characterize the relative distance between the bubble and the rigid cylinder, and the influence of the distance parameter on jet impact pressure, maximum jet velocity and bubble core movement was studied. The results show that, with the increase of the distance parameter, the jet impact pressure gradually decreases, and the maximum jet velocity inside the bubble increases first and then decreases, the deviation of the bubble core decreases with the increase of the distance parameter. © 2022 Beijing Institute of Technology. All rights reserved.