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Dynamics and stability of gap-flow interference in a vibrating side-by-side arrangement of two circular cylinders

Published online by Cambridge University Press:  20 September 2018

B. Liu Open the ORCID record for B. Liu [Opens in a new window]  and
R. K. Jaiman Open the ORCID record for R. K. Jaiman [Opens in a new window]
B. Liu
Affiliation:
Department of Mechanical Engineering, National University of Singapore, Singapore 119077, Singapore
R. K. Jaiman
Affiliation:
Department of Mechanical Engineering, National University of Singapore, Singapore 119077, Singapore
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Abstract

In this work, the coupled dynamics of the gap flow and the vortex-induced vibration (VIV) of a side-by-side (SBS) arrangement of two circular cylinders is numerically investigated at Reynolds numbers $100\leqslant Re\leqslant 500$. The influence of VIV is incorporated by allowing one of the cylinders to vibrate freely in the transverse direction, which is termed as a vibrating side-by-side (VSBS) arrangement. A comparative three-dimensional study is performed between the stationary side-by-side (SSBS) and the VSBS arrangements to examine the characteristics of the complex coupling between the VIV and the gap flow. The results are also contrasted against the isolated configurations without any proximity and gap-flow interference. Of particular interest is to establish a relationship between the VIV, the gap flow and the near-wake instability behind bluff bodies. We find that the kinematics of the VIV regulates the streamwise vorticity concentration, which accompanies a recovery of the two-dimensional hydrodynamic response at the peak lock-in. Moreover, the near-wake instability may develop around an indeterminant two-dimensional streamline saddle point along the interfaces of a pair of imbalanced counter-signed vorticity clusters. The interaction between the imbalanced vorticity clusters and the gap-flow momentum are closely interlinked with the prominence of streamwise vortical structures. In both SSBS and VSBS arrangements, the flip-flopping frequency is significantly low for the three-dimensional flow, except at the VIV lock-in for the VSBS arrangement. While an early onset of VIV lock-in is observed for the vibrating configuration, a quasi-stable deflected gap-flow regime with stably deflected gap flow is found at the peak lock-in. The increase of the gap-flow proximity interference promotes the energy transfer and stabilizes the VIV lock-in. Finally, we employ the dynamic mode decomposition procedure to characterize the space–time evolution of the vortex wake system behind the cylinders.

JFM classification

Vortex Flows: Vortex Flows Wakes/Jets: Wakes/Jets
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 855 , 25 November 2018 , pp. 804 - 838
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Copyright
© 2018 Cambridge University Press 

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Footnotes

†

Present address: Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada. Email address for correspondence: rjaiman@mech.ubc.ca

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