Abstract In the marine and ocean engineering area, the water-entry process is a typical problem of fluid-solid interaction, which involves complex phenomenon such as the large deformation of free surface and considerable structure movement. In this process, the predicting impact load and summarizing the evolution law of the free surface deformation have important reference significance for the hull structure design. To address this issue, numerical simulations are carried out using a robust Smoothed Particle Hydrodynamics (SPH) model. The accuracy of the present SPH model is firstly validated by simulating the water entry of bow-flare section in two and three dimensions, respectively. Then, we investigate the variation characteristics of impact load and the evolution of free surface during the entry of the bow-flare ship section with different roll angles ( θ = 0 ∘ ∼ 20 . 3 ∘ ). Attention is focused on the flow separating phenomenon and the spray jet on the free surface. Finally, the water entry of a three dimensional ship hull is simulated. The velocity and pressure of flow field are analyzed and some conclusions are drawn.

中文翻译：

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基于光滑粒子流体动力学方法的船体砰击分析

摘要 在海洋工程领域，入水过程是典型的流固耦合问题，涉及自由面大变形、结构运动剧烈等复杂现象。在此过程中，预测冲击载荷，总结自由面变形的演化规律，对船体结构设计具有重要的参考意义。为了解决这个问题，使用稳健的平滑粒子流体动力学 (SPH) 模型进行数值模拟。本SPH模型的准确性首先通过分别在二维和三维上模拟船首扩口部分的水进入来验证。然后，我们研究了不同横摇角（ θ = 0 ∘ ∼ 20 . 3 ∘ ）的船首扩口船段进入过程中冲击载荷的变化特征和自由表面的演变。注意力集中在自由表面上的流动分离现象和喷射射流上。最后，模拟了三维船体的进水。分析了流场的速度和压力，得出了一些结论。