Abstract An experimental and computational investigation was conducted to study the interaction between bubbles generated by an underwater explosive (UNDEX) and a nearby steel plate structure. The experiments were performed for different standoff distances to investigate the interaction between the gas bubble and the rigid structure. High-speed photography was utilized to capture the underwater explosive gas bubble’s behavior, and a series of pressure transducers were used to record the emitted pressure histories. The numerical simulations were performed with the Dynamic System Mechanics Advanced Simulation software, which is a full y coupled Eulerian–Lagrangian fluid–structure interaction code. The numerical simulations were validated with the experiments in terms of the detonation pressure, structural surface pressures, and UNDEX gas bubble growth and collapse. Results show that the UNDEX standoff distance greatly influences the gas bubble’s shape, migration speed, bubble jetting behavior, and loading into its adjacent structure. Moreover, the impulse generated by the shock wave on the plate surface proved to be small in comparison to the impulse generated by the collapse of the UNDEX gas bubble. The magnitude of impulse depends on standoff distance, collapse symmetry, and relative collapse location.

中文翻译：

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水下爆炸气泡与相邻水下结构的相互作用

摘要 为了研究水下炸药（UNDEX）产生的气泡与附近钢板结构之间的相互作用，进行了实验和计算研究。对不同的间隔距离进行了实验，以研究气泡与刚性结构之间的相互作用。利用高速摄影捕捉水下爆炸性气泡的行为，并使用一系列压力传感器记录释放的压力历史。数值模拟是使用动态系统力学高级模拟软件进行的，该软件是一个完全 y 耦合的欧拉-拉格朗日流固耦合代码。数值模拟在爆轰压力、结构表面压力、和 UNDEX 气泡的增长和崩溃。结果表明，UNDEX 间隔距离极大地影响气泡的形状、迁移速度、气泡喷射行为以及对其相邻结构的加载。此外，与 UNDEX 气泡坍塌所产生的脉冲相比，板表面的冲击波所产生的脉冲被证明是很小的。冲量的大小取决于间隔距离、倒塌对称性和相对倒塌位置。