Numerical Simulation for Cavitation Inception by Focused Ultrasound Using the Ghost Fluid Method Coupled with Bubble Dynamics

This study deals with numerical simulations of the growth bubble nuclei and corresponding cloud formation in a pressure field given by high intensity focused ultrasound (HIFU) backscattered from laser-induced interface. The imposed on is calculated Ghost Fluid Method (GFM). microscopic that cannot be resolved under Eulerian grids GFM evaluated using Keller equation for dynamics. Once grow so lager they can captured level-set function, method takes over computation macroscopic field. validity present confirmed single nucleus placed HIFU propagation axis near bubble. first following collapse function are fairly good agreement those predicted keeping acceptable mass conservation, although accuracy depends grid resolution. It also shown there exists configuration where multiple bubbles more stably than when each grows solely: stable become new reflector leading to negative next cavitation inception occur. Finally, we demonstrate cone-like observed experiments (Ogasawara et al. (2018); Horiba (2020)) method. simulated process supports experiments.