Suppression of vortex-induced vibration of a circular cylinder by a finite-span flexible splitter plate

Cui, Guo-Peng; Feng, Li-Hao

doi:10.1103/physrevfluids.7.024708

Cited by 11 publications

(1 citation statement)

References 41 publications

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“…However, this approach may have limited effects on VIV control, as it often results in relatively small disturbances to the flow field and insignificant changes to the stability characteristics of the flow. In order to enhance the perturbations to the flow field, additional passive measures have been employed, such as the splitter plate (Pfister & Marquet 2020; Cui & Feng 2022; Mittal & Sharma 2022), strakes (Sui et al. 2016) and tripping wires (Kim et al.…”

Section: Introductionmentioning

confidence: 99%

Elimination of lock-in phenomenon in vortex-induced vibration by passive modal control

Luo,

Gao,

Lyu

et al. 2024

J. Fluid Mech.

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Theoretical analysis and numerical results have shown that frequency lock-in in vortex-induced vibration (VIV) is caused by the instability of the structural mode rather than a resonant response to external excitations. However, there is a lack of experimental evidence supporting relevant theoretical research findings. This study investigates VIV suppression with a passive modal controller (PMC) for a circular cylinder at Reynolds numbers $Re = 60$ and $Re = 40$ , using experiments to distinguish the effects of stable and unstable wake modes. Comparative analysis before and after the implementation of the PMC reveals significant reduction in the vibration amplitude and the disappearance of the lock-in phenomenon at $Re = 60$ . The vibration frequency closely follows the vortex shedding frequency after control, while dynamic mode decomposition of the flow field indicates that the wake mode is dominant. For $Re = 40$ , the vibration is eliminated and the flow becomes steady. Additionally, the root loci of the coupled system are investigated before and after the PMC implementation via linear stability analysis. The results indicate that the PMC can alter the dynamic characteristics of the original system, causing the structural mode and PMC mode to couple when approaching the PMC frequency. Then, the interaction typically improves the stability of the structural mode. Finally, a parametric study is conducted in the experiment, as well as a linear stability analysis. The study provides experimental evidence that stability control of the structural mode is the key to suppressing VIV and eliminating the lock-in phenomenon.

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