On the hydrodynamic performance of a vertical pile-restrained WEC-type floating breakwater
On the hydrodynamic performance of a vertical pile-restrained WEC-type floating breakwater
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DOI：
10.1016/j.renene.2019.06.149
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发表时间：
2020-02
期刊：
影响因子：
8.7
通讯作者：
Qiang Chen;J. Zang;J. Birchall;D. Ning;Xuanlie Zhao;Junliang Gao
中科院分区：
文献类型：
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作者：
Qiang Chen;J. Zang;J. Birchall;D. Ning;Xuanlie Zhao;Junliang Gao
本文对一种直立桩约束波能转换型浮式防波堤的水动力性能进行了数值研究。目的是进一步了解这种集成系统在波能提取和波衰减方面的特性，并为优化浮式防波堤的形状提供指导，以同时实现更多的能量吸收和更少的波传播。数值模型求解不可压缩的Navier-Stokes方程的自由表面流动使用的粒子在细胞的方法，并结合了笛卡尔切割细胞为基础的强耦合算法的流体-结构相互作用。数值模型首先验证了现有的实验，包括一个矩形箱作为浮式防波堤和一个动力输出系统安装在防波堤上方，用于计算的捕获宽度比和波浪透射系数。在此基础上，进行了基于数值模型的优化研究，重点是修改用于实验的浮式防波堤的形状。结果表明，通过改变只有向海侧直角的矩形盒的一个小的曲线角，集成系统实现了显着更多的波能提取的成本只有轻微增加的波传输。
This paper presents a numerical study on the hydrodynamic performance of a vertical pile-restrained wave energy converter type floating breakwater. The aims are to further understand the characteristics of such integrated system in terms of both wave energy extraction and wave attenuation, and to provide guidance for optimising the shape of the floating breakwater for more energy absorption and less wave transmission at the same time. The numerical model solves the incompressible Navier-Stokes equations for free-surface flows using the particle-in-cell method and incorporates a Cartesian cut cell based strong coupling algorithm for fluid-structure interaction. The numerical model is first validated against an existing experiment, consisting of a rectangular box as the floating breakwater and a power take-off system installed above the breakwater, for the computation of the capture width ratio and wave transmission coefficients. Following that, an optimisation study based on the numerical model is conducted focusing on modifying the shape of the floating breakwater used in the experiment. The results indicate that by changing only the seaward side straight corner of the rectangular box to a small curve corner, the integrated system achieves significantly more wave energy extraction at the cost of only a slight increase in wave transmission.