Wind tunnel test study on flow-induced vibration of parallel dual-rigid cylinder

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 197-204.

HU Zhongming1,2, WANG Jiasong2, SUN Yuankun2, ZHENG Hanxu2

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Abstract

Flow-induced vibrations of a side-by-side arrangement of two rigid cylinders which are elastically mounted have been investigated in a wind tunnel at Re = 3200-36200. The spacing ratios S/D are from 1.5 to 4.0, where S is the center-to-center spacing and D is the cylinder diameter. With the change of S/D, two patterns of the vibration amplitudes can be classified: Vortex-induced vibration (VIV) and Wake-coupled vortex-induced vibration (WCVIV). WCVIV is occurred at S/D ≤ 3.0 and there exists strong interference between the two cylinders. The vibrations amplitude responses of the two cylinders are inconsistent which show the in-phase or antiphase characteristics. Meanwhile, the vortex frequency responses at the symmetry points behind the cylinders are also different. While, VIV takes place when S/D = 4.0. At this time, the two cylinders are independent and the vibration amplitude and vortex frequency responses behind the cylinders are nearly the same, which indicates that the asymmetry of the wake is disappear. The phase angle ‘slips’ periodically instead of equal to a constant value. Additionally, the vibration frequency fo only can be locked to the natural frequency fn, whether the VIV or WCVIV response.

Key words

flow-induced vibration / wind tunnel experiment / side-by-side cylinders / vortex-induced vibration / wake-coupled vortex-induced vibration

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HU Zhongming1,2, WANG Jiasong2, SUN Yuankun2, ZHENG Hanxu2. Wind tunnel test study on flow-induced vibration of parallel dual-rigid cylinder[J]. Journal of Vibration and Shock, 2023, 42(9): 197-204

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