渦放出による浮体－係留系の連成応答評価技術の開発

对多柱式浮式海上风力机的流致运动现象进行了实验研究。研究了不同的几何结构，如间距比和柱体截面形状，结果表明，最佳的结构形式避免了由于绕流而产生的低频和高振幅的运动。观察到两种主要机制：涡流脱落和共振引起的涡激运动(VIM)和非对称入射引起的不稳定现象引起的舞动。根据这些结果，有可能提出关于FIM幅度的最佳几何形状，并研究新的抑制装置来缓解FIM。实验结果与CFD计算进行了比较。对比表明他们之间有很好的一致性。因此，可以得出结论，CFD可以作为一种有用的程序设计工具。

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.