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Vortex-induced vibration of a two degree-of-freedom flexibly mounted circular cylinder in the crossflow direction

Published online by Cambridge University Press:  28 November 2022

Seyedmohammad Mousavisani ,
Naumi Noshin Chowdhury ,
Hadi Samsam-Khayani Open the ORCID record for Hadi Samsam-Khayani [Opens in a new window] ,
Hamed Samandari Open the ORCID record for Hamed Samandari [Opens in a new window]  and
Banafsheh Seyed-Aghazadeh Open the ORCID record for Banafsheh Seyed-Aghazadeh [Opens in a new window]
Seyedmohammad Mousavisani
Affiliation:
Department of Mechanical Engineering, University of Massachusetts, Dartmouth, MA 02747, USA
Naumi Noshin Chowdhury
Affiliation:
Department of Mechanical Engineering, University of Massachusetts, Dartmouth, MA 02747, USA
Hadi Samsam-Khayani
Affiliation:
Department of Mechanical Engineering, University of Massachusetts, Dartmouth, MA 02747, USA
Hamed Samandari
Affiliation:
Department of Mechanical Engineering, University of Massachusetts, Dartmouth, MA 02747, USA
Banafsheh Seyed-Aghazadeh*
Affiliation:
Department of Mechanical Engineering, University of Massachusetts, Dartmouth, MA 02747, USA
*
†Email address for correspondence: b.aghazadeh@umassd.edu
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Abstract

Vortex-induced vibration (VIV) of a two degree-of-freedom (DOF) circular cylinder, placed in the test section of a recirculating water tunnel and free to oscillate in its first two vibrational modes in the crossflow direction, is studied experimentally. The dynamic response of the cylinder is studied for a reduced velocity range of $U^*=4\unicode{x2013}30$ for eigenfrequency ratios in the range of 1.3–3.0. For the two DOF system, while the onset of the VIV response followed a similar lock-in region as those observed for a classical VIV response of a single DOF system, by increasing the reduced velocity a secondary lock-in region was observed over which the oscillations of the cylinder were locked into the system's second mode. In addition, there existed an intermediate range of reduced velocity over which the VIV response consisted of oscillations at a combination of the first two natural modes of the system. As the eigenfrequency ratio between the first two modes increased, the secondary lock-in range was extended to higher reduced velocities and the reduced velocity range over which multi-modal oscillations were observed was decreased. A full map of vortex dynamics in the wake of the cylinder was developed qualitatively and quantitatively using hydrogen bubble flow visualization and time-resolved volumetric particle tracking velocimetry techniques, respectively. A Q-criterion analysis revealed the existence of highly three-dimensional vortex structures in the wake of the cylinder. The spatiotemporal mode analysis using the proper orthogonal decomposition technique revealed strong coupling between the vortex shedding modes in the wake of the cylinder and the structural vibration modes.

JFM classification

Vortex Flows: Vortex dynamics Vortex Flows: Vortex shedding

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Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 952 , 10 December 2022 , A26
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© The Author(s), 2022. Published by Cambridge University Press

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Footnotes

‡

These authors contributed equally to this work.

References

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Mousavisani et al. supplementary movie 1

Movie1: Eigenfrequency ratio=1.7-U*=5.4-Shedding pattern: 2S
Download Mousavisani et al. supplementary movie 1(Video)
Video 11.1 MB

Mousavisani et al. supplementary movie 2

Movie2: Eigenfrequency ratio=1.7-U*=6.7-Shedding pattern: 2S*
Download Mousavisani et al. supplementary movie 2(Video)
Video 11.5 MB

Mousavisani et al. supplementary movie 3

Movie3: Eigenfrequency ratio=1.7-U*=7.9-Shedding pattern: 2P
Download Mousavisani et al. supplementary movie 3(Video)
Video 10.8 MB

Mousavisani et al. supplementary movie 4

Movie4: Eigenfrequency ratio=1.7-U*=9.8-Shedding pattern: SST
Download Mousavisani et al. supplementary movie 4(Video)
Video 11 MB