Evolution characteristics of bubble collapse near a wall and modeling of induced peak pressure

This study employs a compressible flow numerical simulation method based on the equation of state to investigate the impact of bubble collapse processes at varying distances from the wall on erosive pressure. Based on energy conversion theory, a modeling analysis is conducted on the magnitudes and time intervals of water hammer pressure waves and collapse pressure waves. The results show that when bubbles collapse near the wall, a high-pressure zone develops at the bubble apex, generating a high-speed jet directed toward the wall. During the jet's penetration through the bubble, both water hammer pressure waves and collapse-induced pressure waves are generated. The distance between the bubble and the wall directly determines the intensity and temporal evolution characteristics of the pressure waves induced by the bubble collapse. Statistical analysis of pressure waves at different distances reveals that the water hammer effect is the fundamental cause of wall erosion. The peak pressure model proposed in this study provides robust support for understanding the complex flow field characteristics during bubble collapse and their impact on wall, thereby offering theoretical guidance for preventing and controlling cavitation erosion in engineering applications.