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Motion-induced vortex shedding and lock-in phenomena of a rectangular section

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Abstract

The nonlinear vortex-induced vibration of a rectangular section with an aspect ratio B/D = 6 is investigated in this study, aiming at explanation of the phenomenon of double lock-in ranges. First, numerical results by two-dimensional CFD simulation are compared with experimental results; then flow field characteristics, aerodynamic loadings and structural motion properties are presented and discussed; finally, an energy-trapping-based model for motion stability is brought forward, based on which the observed aeroelastic phenomena are discussed. The present study shows the motion-induced lock-in range is able to be explained qualitatively with the proposed principle describing the free-oscillation stability. Within the motion-induced lock-in range, the 1-DOF system can experience two motion components. The dominance of the free vibration fueled by feedback lift can dwarf or even eliminate the vortex-shedding-induced motion. Further, it is demonstrated that the phase angle between the lift and motion velocity, instead of the load amplitude, dominates the motion stability.

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Acknowledgements

For the work described in this paper, authors would like to express their gratitude to the financial support from the National Natural Science Foundation of China (Grant Number 51578233 and 51938012).

Funding

This study was funded by the National Natural Science Foundation of China (Grant Number 51578233 and 51938012).

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Authors and Affiliations

  1. College of Civil Engineering and Architecture, Hainan University, Haikou, China

    Zhitian Zhang

  2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China

    Xianxiong Zhang & Yaojun Ge

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  1. Zhitian Zhang
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  2. Xianxiong Zhang
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  3. Yaojun Ge
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Correspondence to Zhitian Zhang.

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Zhang, Z., Zhang, X. & Ge, Y. Motion-induced vortex shedding and lock-in phenomena of a rectangular section. Nonlinear Dyn 102, 2267–2280 (2020). https://doi.org/10.1007/s11071-020-06080-w

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