Abstract This paper describes an investigation of the motion, structural response, and cavitation bubble evolution of a cylinder in the high-speed water entry (HSWE) process using a fluid-structure interaction (FSI) method. The effectiveness and accuracy of the FSI method are verified by comparison with experimental results available in the literature. The results show that the cylinder structure is deformed when considering the coupling effect between the fluid and the structure, and the impact load during water entry presents obvious fluctuation characteristics. Meanwhile, the von Mises stress distribution on the two end faces of the cylinder is in a ring shape and propagates as the structure deforms. Moreover, the cavitation bubble dynamics, motion and structural loads of the cylinder under different water entry velocities are investigated. The load at the initial stage is greater with the increase of the water entry velocity, which in turn leads to more significant fluctuation characteristics, thereby increasing the deformation of the structure.

中文翻译：

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基于流固耦合法的圆柱高速入水空泡动力学及结构载荷

摘要 本文描述了使用流固耦合 (FSI) 方法对高速入水 (HSWE) 过程中圆柱体的运动、结构响应和空化气泡演化的研究。通过与文献中可用的实验结果进行比较，验证了 FSI 方法的有效性和准确性。结果表明，考虑流体与结构的耦合作用时，圆柱体结构发生变形，进水时的冲击载荷呈现明显的波动特征。同时，圆柱体两端面上的von Mises应力分布呈环状，并随着结构变形而传播。此外，研究了不同入水速度下圆柱体的空化气泡动力学、运动和结构载荷。