Abstract Box-type floating breakwaters have been studied extensively. However, the examinations of the performances of them with different shapes or different numbers of boxes are limited. In addition, if it is possible to optimize the floating breakwaters by combining the optimized parameters in separated testing groups is still unclear. Consequently, in this study, four typical box-type floating breakwaters, i.e., dual rectangular breakwater, single rectangular breakwater, dual circular breakwater, and single circular breakwater, are selected to do extensive investigations using SPH. The coupling between DualSPHysics and MoorDyn is implemented and verified, and the coupled code can be applied to simulate the interactions between waves and moored floating structures. A total of 88 cases are modeled, and the effects of the geometry parameters on wave-attenuation performances of the breakwaters are clarified. The numerical results show that the performances of the breakwaters are greatly sensitive to the immersion depth. In general, the larger and lighter the breakwaters, the better the performances will be. Meanwhile, the dual rectangular breakwater performs the best in wave attenuations, and its motions and forces are smaller than single breakwaters. Importantly, combining the optimized parameters in each separated testing group is found to be effective to optimize the floating breakwaters.

中文翻译：

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典型水下箱式浮动防波堤SPH数值研究与优化

摘要 箱式浮动防波堤得到了广泛的研究。然而，对它们不同形状或不同数量的盒子的性能的考察是有限的。此外，是否可以通过组合不同测试组的优化参数来优化浮动防波堤，目前尚不清楚。因此，本研究选择双矩形防波堤、单矩形防波堤、双圆形防波堤和单圆形防波堤四种典型的箱式浮动防波堤，利用SPH进行了广泛的研究。实现并验证了 DualSPPhysics 和 MoorDyn 之间的耦合，耦合代码可用于模拟波浪与系泊浮体之间的相互作用。共建模88个案例，阐明了几何参数对防波堤减浪性能的影响。数值结果表明，防波堤的性能对浸入深度非常敏感。一般来说，防波堤越大越轻，性能越好。同时，双矩形防波堤的波浪衰减性能最好，其运动和受力小于单防波堤。重要的是，发现在每个单独的测试组中组合优化参数可有效优化浮动防波堤。表演会越好。同时，双矩形防波堤的波浪衰减性能最好，其运动和受力小于单防波堤。重要的是，发现在每个单独的测试组中组合优化参数可有效优化浮动防波堤。表演会越好。同时，双矩形防波堤的波浪衰减性能最好，其运动和受力小于单防波堤。重要的是，发现在每个单独的测试组中组合优化参数可有效优化浮动防波堤。