Numerical investigation of shock wave propagation and high-pressure bubble dynamics near a deformable plate with an initial opening

The boundary with an initial opening significantly affects shock wave propagation and bubble dynamics. To investigate the associated loading characteristics, this paper employs an axisymmetric Riemann-SPH method to simulate the shock wave and bubble near a single-layer deformable wall with an initial opening. The numerical model is first validated by simulating a spark-generated bubble experiment. Subsequently, the effects of plate deformation, opening radius, and stand-off distance on shock wave propagation, bubble pulsation, and jet evolution are systematically analyzed. The results show that plate deformation has little influence on shock wave propagation but significantly alters bubble pulsation and jet formation. At the opening center, the pressure history evolves from a double-peak to a single peak with increasing opening radius or stand-off distance. Bubble evolution presents three distinct jet modes: vertical jet, oblique jet tendency, and oblique jet. Small opening radii combined with short stand-off distances promote high-speed oblique jets and toroidal bubble formation, whereas increasing the stand-off distance weakens plate confinement, causing the bubble dynamics to gradually approach those in the free field. The study provides useful insight into shock wave propagation and bubble dynamics near non-intact plates and offers a reference for evaluating underwater explosion loading on damaged structures.