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An experimental investigation of vortex-induced vibration of a curved flexible cylinder

Published online by Cambridge University Press:  28 September 2021

Banafsheh Seyed-Aghazadeh Open the ORCID record for Banafsheh Seyed-Aghazadeh [Opens in a new window] ,
Bridget Benner ,
Xhino Gjokollari  and
Yahya Modarres-Sadeghi Open the ORCID record for Yahya Modarres-Sadeghi [Opens in a new window]
Banafsheh Seyed-Aghazadeh*
Affiliation:
Department of Mechanical Engineering, University of Massachusetts Dartmouth, Dartmouth, MA02747, USA
Bridget Benner
Affiliation:
Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, MA01003, USA
Xhino Gjokollari
Affiliation:
Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, MA01003, USA
Yahya Modarres-Sadeghi
Affiliation:
Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, MA01003, USA
*
†Email address for correspondence: [email protected]
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Abstract

Vortex-induced vibration of a curved flexible cylinder placed in the test section of a recirculating water tunnel and fixed at both ends is studied experimentally. Both the concave and the convex orientations (with respect to the incoming flow direction) are considered. The cylinder was hung by its own weight with a dimensionless radius of curvature of $R/D=66$, and a low mass ratio of $m^{*} = 3.6$. A high-speed imaging technique was employed to record the oscillations of the cylinder in the cross-flow direction for a reduced velocity range of $U^{*} = 3.7 - 48.4$, corresponding to a Reynolds number range of $Re= 165 - 2146$. Mono- and multi-frequency responses as well as transition from low-mode-number to high-mode-number oscillations were observed. Regardless of the type of curvature, both odd and even mode shapes were excited in the cross-flow directions. However, the response of the system, in terms of the excited modes, amplitudes and frequencies of the oscillations, was observed to be sensitive to the direction of the curvature (i.e. concave vs convex), in particular at higher reduced velocities, where mode transition occurred. Hydrogen bubble flow visualization exhibited highly three-dimensional vortex shedding patterns in the wake of the cylinder, where there existed spatial and temporal evolution of the vortex shedding modes along the length of the cylinder. The time-varying intermittent vortex shedding in the wake of the cylinder was linked to the spanwise travelling wave behaviour of the vortex-induced vibration response. The observed spatially altering wake corresponded to the multi-modal excitation and mode transition along the length of the cylinder.

JFM classification

Vortex Flows: Vortex shedding Wakes/Jets: Wakes Aerodynamics: Flow-structure interactions
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 927 , 25 November 2021 , A21
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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