长周期波浪下双浮箱浮式防波堤消浪性能

Wave dissipation performance of double pontoon floating breakwater under long-period wave

长周期波作用下浮式防波堤消浪性能的研究对于浮式防波堤的工程应用起着重要作用。基于开源软件OpenFOAM,采用RANS方程和SST k-ω紊流模型模拟流场,通过重叠网格方法实现波浪-浮式防波堤相互作用的模拟。移植并应用MOODY程序库,构建二维流固耦合双浮箱数值波浪水槽模型。通过已有物理模型进行验证,证明模型的可靠性。进而开展单双浮箱消浪性能对比研究,分别研究波高、浮箱个数、浮箱间距和锚链刚度对浮箱消浪性能的影响。得出结论:1)波高增加时浮箱消浪性能提高;2)为提高消浪性能,应尽可能采用双浮箱(或者多浮箱)缩短浮箱间距;3)增加锚链刚度也可以提高浮箱的消浪性能。

Research on the wave dissipation performance of floating breakwater under long-period wave plays an important role in the engineering application of floating breakwater. Based on the open-source OpenFOAM,the RANS equation and SST k-ω turbulence model are used to simulate the flow field, and the overset method is used to simulate the interaction between wave and a floating breakwater. By transplanting and applying the MOODY library, a two-dimensional fluid-solid coupling double-pontoon numerical wave flume model is constructed. Through the verification of the existing physical model, the reliability of the model is proved. Then the comparative study on the wave dissipation performance of single-pontoon and double-pontoon is carried out, so the influence of wave height, number of floating breakwaters, the distance of floating breakwaters, and anchor chain stiffness on the wave dissipation performance of floating pontoon is studied respectively. It is concluded that: 1)When the wave height increases, the wave dissipation performance of the floating pontoon will be improved. 2)To improve the wave dissipation performance, double-pontoon(or multiple pontoons)should be used as much as possible to shorten the spacing of the floating pontoons. 3)Increasing the stiffness of the anchor chain can also improve the wave-eliminating performance of the floating pontoons.