渦放出による浮体－係留系の連成応答評価技術の開発

对多柱浮式海上风力机的流致运动现象进行了实验研究。研究了不同的几何形状，如间距比和柱截面形状。结果表明，最佳的配置可以避免由于系统周围流动而产生的低频和高幅值运动。观察到两种主要机制：由涡脱落和共振引起的涡致运动（VIM）；而驰动由于不稳定现象引起的不对称入射流。从这些结果中，可以提出关于FIM振幅的最佳几何形状，也可以研究新的抑制装置来减轻FIM。实验结果与CFD计算结果进行了比较。比较表明他们之间很一致。因此，可以得出结论，CFD可以成为设计过程的有用工具。

FIM (flow-induced motions) phenomenon was investigated experimentally around multi-column FOWT (floating offshore wind turbines). Different geometries were studied as spacing ratio and column section shape.The results showed the best configurations to avoid the low frequency and high amplitudes of the motions due to the flow around the system. Two main mechanisms were observed: VIM (vortex-induced motions) due to the vortex shedding and resonance; and galloping due to the instability phenomenon caused by the asymmetric incidence of the flow.From these results, it is possible to propose the best geometry regarding the FIM amplitudes and also investigate new suppression devices to mitigate the FIM.The experimental results were compared with CFD calculations. The comparison showed a good agreement between them. Therefore, it is possible to conclude that the CFD can be a useful tool for designing procedure.