The duration of an explosion shock wave is a critical parameter in actual explosion scenarios. Insufficient attention has been paid to its influence on surface loading and the consequent damage effects. To investigate how blast wave duration impacts shell pressure loading, we conducted a numerical analysis of fine flow structures and pressure-loading distributions during blast wave interactions with cylindrical shells using high-order large-eddy simulation. The research findings demonstrate that the interaction of explosive waves with cylindrical shells leads to reflected shock waves, expansion waves, decelerating shock waves, and Mach stems. The inherent structural differences within this wave system led to a correlation between the angle and height of the surface load exerted on the shell. The increase in duration enhances the reflected shock wave and results in the more complex and variable wake vortex and shock wave structures on the shell leeward, which enhances the pressure-loading oscillation on the shell leeward. The research also revealed that when the duration surpasses a specific critical threshold, various forms of stationary shock waves will be generated. The structure of the flow field and the surface loads will remain steady-state as the duration continues to extend.
Zhang et al. (Thu,) studied this question.