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<p>In this study, inverted flexible and rigid splitter plates are applied to control the vortex-induced vibration of a circular cylinder. The vortex-induced vibration (VIV) characteristics and vortex dynamics are experimentally investigated with a Reynolds number ranging from 1970 to 10,590. To examine the effect of the streamwise length, five different lengths are selected. It is indicated that the VIV of the circular cylinder is suppressed by the inverted rigid splitter plate and the suppression effect is improved with an increase in the streamwise length of the plate, however, the vibration response behaviors remain the same for all streamwise lengths. Compared to the rigid one, the inverted flexible splitter plate causes various vibration responses with the change of its streamwise length. The diverse vibration responses are related to the kinematic characteristics of the inverted flexible splitter plate and the vortex dynamics. Five vortex shedding modes, including “Kármán vortex”, “Bi-LEV + Bi-WV” (Bi-LEV: bilateral leading-edge vortex; Bi-WV: bilateral wake vortex), “2Bi-LEV + Bi-WV” (2Bi-LEV: two pairs of bilateral leading-edge vortex), “Uni-LEV + Uni-WV” (Uni-LEV: unilateral leading-edge vortex; Uni-WV: unilateral wake vortex), and “K-H instability” (Kelvin–Helmholtz instability), are found based on the number of vortices in one vibration cycle. The correlation between the VIV and the vortex shedding mode is revealed. The “Kármán vortex” and “K-H instability” modes are corresponding to a better effect of suppressing VIV. The control effect of “LEV + WV” modes is affected by the kinematics of the plate, as it is found that the vibration amplitude of the circular cylinder and the inverted flexible splitter plate is positively correlated.</p>

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Vortex-induced vibration and flow characteristics of a circular cylinder attached with inverted flexible and rigid splitter plates

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Guo-Peng Cui,
  • Li-Hao Feng

摘要

In this study, inverted flexible and rigid splitter plates are applied to control the vortex-induced vibration of a circular cylinder. The vortex-induced vibration (VIV) characteristics and vortex dynamics are experimentally investigated with a Reynolds number ranging from 1970 to 10,590. To examine the effect of the streamwise length, five different lengths are selected. It is indicated that the VIV of the circular cylinder is suppressed by the inverted rigid splitter plate and the suppression effect is improved with an increase in the streamwise length of the plate, however, the vibration response behaviors remain the same for all streamwise lengths. Compared to the rigid one, the inverted flexible splitter plate causes various vibration responses with the change of its streamwise length. The diverse vibration responses are related to the kinematic characteristics of the inverted flexible splitter plate and the vortex dynamics. Five vortex shedding modes, including “Kármán vortex”, “Bi-LEV + Bi-WV” (Bi-LEV: bilateral leading-edge vortex; Bi-WV: bilateral wake vortex), “2Bi-LEV + Bi-WV” (2Bi-LEV: two pairs of bilateral leading-edge vortex), “Uni-LEV + Uni-WV” (Uni-LEV: unilateral leading-edge vortex; Uni-WV: unilateral wake vortex), and “K-H instability” (Kelvin–Helmholtz instability), are found based on the number of vortices in one vibration cycle. The correlation between the VIV and the vortex shedding mode is revealed. The “Kármán vortex” and “K-H instability” modes are corresponding to a better effect of suppressing VIV. The control effect of “LEV + WV” modes is affected by the kinematics of the plate, as it is found that the vibration amplitude of the circular cylinder and the inverted flexible splitter plate is positively correlated.