INVESTIGATION ON THE RESPONSES OF FLOW-INDUCED VIBRATION OF FOUR SQUARE-ARRANGED CIRCULAR CYLINDERS

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (11) : 54-60.

JI Chun-ning 1，2 CHEN Wei-lin 1 XU Wan-hai 1

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Abstract

Flow-induced vibration of four square-arranged circular cylinders with a center-to-center spacing ratio of and zero attack angle is numerically investigated. The vibration is constrained in cross-flow direction, the reduced velocity is in the range of and the Reynolds number is . Results show that the responses of two upstream cylinders are similar to those of VIV of an isolated cylinder, in which the initial and lower branches are clearly observed. The upstream two cylinders obtain their maximum vibration amplitude of at the reduced velocity , which is close to that of an isolated cylinder . The two downstream cylinders obtain their maximum amplitude at the reduced velocity , which is 74.8% larger than that of an isolated cylinder. Three asymmetric vibration regions are observed, i.e., the first asymmetric vibration region , the second asymmetric vibration region and the third asymmetric vibration region . The asymmetric vibrating pattern of the cylinders are closely related with the asymmetric wake patterns and the stably biased gap flow.

Key words

Flow-induced vibration / square arrangement / circular cylinder / vibration response

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JI Chun-ning 1，2 CHEN Wei-lin 1 XU Wan-hai 1. INVESTIGATION ON THE RESPONSES OF FLOW-INDUCED VIBRATION OF FOUR SQUARE-ARRANGED CIRCULAR CYLINDERS[J]. Journal of Vibration and Shock, 2016, 35(11): 54-60

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