A numerical simulation study on the interaction between two horizontally placed cavitation bubbles near a rigid wall

Abstract

Investigating the evolution and interaction mechanism of double cavitation bubbles near rigid walls is fundamental to revealing the cavitation erosion mechanism of bubble groups on walls. Using a three-dimensional compressible two-phase flow model that accounts for vapor-liquid phase change mass transfer, this study numerically simulates the transient process and dynamic characteristics of equal-sized cavitation bubble pairs near a rigid wall. The results demonstrate strong agreement between simulated and experimental morphology of the bubble pairs near the rigid wall. The spacing of two bubbles and the distance of wall and bubbles are two key parameters that affect cavitation bubble characteristics. The bubble pair's collapse morphology at the minimum size moment varies with γ and η and follows a certain pattern. The angle between the liquid jet and the horizontal plane decreases as γ increases and increases as η increases.