On the transient dynamics of shock wave–bubble interaction near a solid boundary: Influence of the pressure waveform and standoff distance

Shock wave–bubble interaction (SBI) involves the formation of high-speed liquid jets and the emission of strong shock waves, which attracts the interest of researchers in various fields, such as underwater explosion, marine propeller, and shock wave lithotripsy. In this study, we performed a comprehensive numerical study on the transient dynamics of SBI near a solid boundary. Two types of incident shock waves are explored, including a lithotripter shock wave (LSW) and a blast wave (BW), with their pulse duration (tFWHM) and pressure amplitude (ps) varying. Several unique features are observed. First, the maximum jet speed (ujetmax) for the SBI with an incident LSW exhibits a non-monotonic trend as dimensionless standoff distance (γ) increases, while for cases with an incident BW, the SBI induces higher jet speeds under the same γ due to its longer pulse duration, and ujetmax increases monotonically with increasing γ, following a scaling law ujetmax∼C(psρ)0.5γ0.41. Second, the maximum wall pressure (pwallmax) is highly relevant to the pressure waveform of the incident shock wave other than γ. As the pulse duration (tFWHM) of the BW increases, pwallmax increases nonlinearly, and the water pressure could reach 1.5 GPa, far exceeding the yield strength limit of conventional materials. Finally, it is found that a higher pressure amplitude or longer pulse duration of the incident shock wave lead to a shorter collapse time compared to those without an incident shock wave.