An isolated two-dimensional circular cylinder with two linear degrees of freedom, parallel and perpendicular to the free-stream direction, and owning a nonlinear energy sink (NES) is investigated by fluid–structure interaction (FSI) simulations to assess vortex-induced vibrations (VIV) at moderate Reynolds numbers. Subsequently, the wake-induced vibration (WIV) of a pair of identical cylinders under the action of two NES in a tandem arrangement and in a proximity–wake interference regime is explored using the same approach. The NES parameters (mass, nonlinear stiffness and damping) are investigated to determine their effects on the dynamic response of a single degree of freedom (in transverse flow direction) coupled system by a reduced-order model based on an experimentally validated van der Pol oscillator. The CFD model coupled with FSI method is also validated against VIV experimental data for an isolated cylinder in a uniform flow. The study is aimed to investigate the effect of the passive suppression NES device on VIV and WIV. The amplitude response, trajectories of cylinder motion and temporal evolutions of vortex shedding are obtained by conducting a series of numerical simulations. It is found that placing a tuned NES in the cylinders can provide good suppression effect; however, the effectiveness is function of the reduced velocity.
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This research work was carried out during a visiting scholarship study of the first author at RMIT University. The first author gratefully thanks the financial support by Nanjing University of Science and Technology. Also, special thanks are owing to the Editor-In-Chief, the Associate Editor and the anonymous reviewers for their constructive comments which improved the quality of this paper.
Conflict of interest
The authors declare that they have no conflict of interest.
The UDF codes of VIV of 2-DOF cylinder under action with NES are shown as follows:
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Dongyang, C., Abbas, L.K., Guoping, W. et al. Numerical study of flow-induced vibrations of cylinders under the action of nonlinear energy sinks (NESs). Nonlinear Dyn 94, 925–957 (2018). https://doi.org/10.1007/s11071-018-4402-z
- Nonlinear energy sink
- Fluid–structure interaction
- Van der Pol oscillator
- Vortex-induced vibrations
- Wake-induced vibrations
- Passive suppression device