Multi-scale Computational Model of Underwater Explosion Shock Wave-Bubble Based on SPH and Its Application

Key Points

• The study aims to develop a multiscale computational model to accurately simulate underwater explosions and their effects on shock waves and bubbles.
• Utilized a novel Riemann SPH method combined with JWL-Ideal Gas equations for improved simulations.
• Conducted experiments in free fields and free surfaces to validate the computational model.
• Analyzed pressure evolution across micro to millisecond scales.
• Achieved a significant accuracy improvement, with shock wave and bubble pulse pressure peak errors of only 5.29% and -13.10%.
• Validated maximum bubble radius and period correlating with experimental results, with a maximum relative error below 3%.
• Revealed mechanisms for bubble jet formation and internal thermodynamic evolution.