A foam sourced ejecta model based on shock-induced bubble collapse

Ejecta particles are known to be produced from a material surface following the passage of a shock wave. Traditionally, this phenomenon has been attributed to the Richtmyer-Meshkov Instability (RMI), where spike growth occurs and eventually leads to the breakup of liquid into droplets. In this study, we investigate an alternative scenario in which ejecta are generated from a foam-like material containing numerous gas bubbles. We hypothesize that a mechanism analogous to RMI governs this process: the shock wave deposits vorticity on the surface of each bubble, leading to the formation of jets. These jets may penetrate the opposite side of the bubble wall and enter the surrounding gas phase, potentially generating ejecta. We present an analytical model developed to describe this mechanism and compare its predictions for ejecta mass and size distributions with those derived from a traditional RMI-based model.