A vortex-induced vibration (VIV) is a typical flow-structure interference phenomenon that causes an unsteady flow pattern owing to vortex shedding at or near the structure’s natural frequency, leading to resonant vibrations. VIVs can cause the failure of marine risers owing to premature fatigue, because of which a growing amount of research has attended to them. To investigate the effects of suppressing the VIV of splitter plates on a square array of cylinders under different spacing ratios, cylinders undergoing VIV in a flow with a Reynolds number ranging from 3300 to 6750 were experimentally studied in this paper. The results show that the splitter plate can suppress cross-flow (CF) vibrations as well as in-line flow (IF) vibrations in the cylinders. For cross-flow vibration, the suppression effects of the splitter plate on the upstream cylinders were at their maximum at $$S/D = 5$$ S / D = 5 while the effects on downstream cylinders reached this at $$S/D = 6$$ S / D = 6 , where $$S/D$$ S / D refers to the ratio of the distance between the centers of cylinders to its diameter. For in-line flow vibrations, the effects on upstream and downstream cylinders all reached the maximum at $$S/D = 4$$ S / D = 4 . The vibrational frequency of the cylinder with splitter plate was also lower than that of the bare cylinder in the flow.

中文翻译：

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不同间距比下四方圆柱体涡激振动抑制实验研究

涡激振动 (VIV) 是一种典型的流动结构干涉现象，由于在结构的固有频率处或附近发生涡旋脱落，从而导致不稳定的流动模式，从而导致共振振动。由于过早疲劳，VIV 可能导致海洋立管失效，因此越来越多的研究已经关注它们。为研究不同间距比下分流板对圆柱阵列方阵VIV的抑制效果，本文对在雷诺数为3300~6750的流动中经受VIV的圆柱进行了实验研究。结果表明，分流板可以抑制气缸中的错流 (CF) 振动和直列流 (IF) 振动。对于横流振动，分流板对上游气缸的抑制效果在 $$S/D = 5$$ S / D = 5 时达到最大值，而对下游气缸的抑制效果在 $$S/D = 6$$ S / D = 6 ，其中 $$S/D$$ S / D 是指圆柱中心之间的距离与其直径的比值。对于直列流动振动，对上游和下游气缸的影响均在 $$S/D = 4$$ S / D = 4 处达到最大值。在流动中，带隔板的圆柱体的振动频率也低于裸圆柱体的振动频率。对上游和下游气缸的影响均在 $$S/D = 4$$ S / D = 4 处达到最大值。在流动中，带隔板的圆柱体的振动频率也低于裸圆柱体的振动频率。对上游和下游气缸的影响均在 $$S/D = 4$$ S / D = 4 处达到最大值。在流动中，带隔板的圆柱体的振动频率也低于裸圆柱体的振动频率。