Implosion of a bubble pair near a solid surface

Abstract

A compressible two-phase flow solver is developed for the simulation of a collapsing bubble pair. With the adaptive mesh and high-resolution scheme, the discontinuities and shock waves due to bubble collapse are well captured. Numerical results show that the collapse of two bubbles horizontally arranged ($\ensuremath{\phi}={0}^{\ensuremath{\circ}}$) produces the highest wall pressure peak among the oblique angles (${0}^{\ensuremath{\circ}}\ensuremath{\le}\ensuremath{\phi}\ensuremath{\le}{90}^{\ensuremath{\circ}}$) while the perpendicular arrangement ( $\ensuremath{\phi}={90}^{\ensuremath{\circ}}$) leads to the lowest wall pressure peak, even weaker than that of the single bubble collapse.