Numerical investigation of near-wall bubble collapse under wall vibration

This study investigates the dynamic behaviors of a single near-wall bubble collapse under various operating conditions, specifically focusing on the effects of wall vibration, vibration frequency, and stand-off distance. The primary objective is to reveal the underlying mechanisms of how vibration influences the collapse process and to provide insights for developing effective cavitation suppression technologies. To achieve this, a two-phase flow numerical simulation coupled with fluid-structure interaction was employed. The Volume of Fluid method was used to track the bubble interface, while the finite volume method was applied to solve the governing equations. The results demonstrate that bubble collapse near a vibrating wall exerts a more pronounced impact than near a static wall, characterized by an accelerated collapse process, a smaller minimum volume, and a higher instantaneous peak temperature. Furthermore, higher vibration frequencies lead to a more rapid contraction and a significantly more intense pressure impulse on the solid boundary. Additionally, reducing the initial stand-off distance continuously increases the severity of the peak impulsive pressure sustained by the wall. The findings provide a theoretical foundation for understanding cavitation erosion mechanisms and developing effective cavitation suppression technologies.