Computational modelling and experimental tank testing of the multi float WaveSub under regular wave forcing
Computational modelling and experimental tank testing of the multi float WaveSub under regular wave forcing
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DOI：
10.1016/j.renene.2019.12.146
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发表时间：
2020-06-01
期刊：
影响因子：
8.7
通讯作者：
Stockman，G.
中科院分区：
文献类型：
--
作者：
Faraggiana，E.;Whitlam，C.;Stockman，G.
水下波浪装置通过浮体的相对运动产生能量。在WaveSub中，三个浮子连接到一个电抗器;每个浮子连接到一个弹簧和发电机。产生的电力抑制了漂浮物的轨道运动。这些力是非线性的，每个浮子与其他浮子相互作用。通过改变线路长度来调整波浪气候，因此需要了解大量配置的性能权衡。这就需要一个高效的、大位移的、多方向的、多体的数值格式。描述了1/25尺度波浪水池实验的结果。在这里，我们表明，时域线性势流公式（Nemoh，WEC-Sim）可以匹配的坦克测试提供适当调整阻力系数。非粘性线性势模型可以匹配一些波浪装置实验;然而，附加的粘性项通常提供更好的精度。尺度实验也容易出现机械摩擦，我们估计摩擦项，以进一步提高相关性。数值模型和物理模型之间的平均功率误差约为10%。预测的器械移动显示匹配良好。总的来说，时域波能建模中的阻力项将提高波浪可再生能源装置设计的模拟精度。
A submerged wave device generates energy from the relative motion of floating bodies. In WaveSub, three floats are joined to a reactor; each connected to a spring and generator. Electricity generated damps the orbital movements of the floats. The forces are non-linear and each float interacts with the others. Tuning to the wave climate is achieved by changing the line lengths, so there is a need to understand the performance trade-offs for a large number of configurations. This requires an efficient, large displacement, multidirectional, multi-body numerical scheme. Results from a 1/25 scale wave basin experiment are described. Here, we show that a time domain linear potential flow formulation (Nemoh, WEC-Sim) can match the tank testing provided that suitably tuned drag coefficients are employed. Inviscid linear potential models can match some wave device experiments; however, additional viscous terms generally provide better accuracy. Scale experiments are also prone to mechanical friction, and we estimate friction terms to improve the correlation further. The resulting error in mean power between numerical and physical models is approximately 10%. Predicted device movement shows a good match. Overall, drag terms in time domain wave energy modelling will improve simulation accuracy in wave renewable energy device design.