Numerical Investigation of Shock-induced Bubble Collapse Near a Rigid Wall

Abstract

The dynamics of multiple shock-accelerated bubbles initially located in the vicinity of a rigid wall are investigated with a finite volume multiphase compressible flow solver. The method employs a coupled color function and level set description of the interface in order to suppress spurious numerical oscillations at the multi-material interface and to counter the excessive numerical diffusion caused by standard shock and interface capturing methods. This approach leads to a more accurate modeling of wave interface interactions and robust handling of topological changes including merger and breakup of the interfaces. Simulations shed light on the complex wave-interface interactions and jetting dynamics that ensue from the impulsive acceleration of shock-impacted bubbles. Implication of these interactions and jetting on the wall pressures is explored in detail.