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Fluid forces acting on a cylinder undergoing streamwise vortex-induced vibrations

Cagney, N; Balabani, S; (2016) Fluid forces acting on a cylinder undergoing streamwise vortex-induced vibrations. Journal of Fluids and Structures , 62 pp. 147-155. 10.1016/j.jfluidstructs.2016.01.007. Green open access

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Abstract

This brief communication examines the fluid forces acting on a cylinder free to move in the streamwise direction throughout its response regime. The amplitude and phase of the unsteady drag coefficient are estimated from the displacement signals and a simple harmonic oscillator model. We examine the counter-intuitive reduction in vibration amplitude observed in streamwise vortex-induced vibrations (VIV) at resonance, which has remained one of the most poorly understood aspects of VIV. Our results show that it is not caused by a change in the phase of the fluid forcing with respect to the cylinder displacement, as suggested by previous researchers; instead, we show that there is a sudden decrease in the amplitude of the unsteady drag coefficient in this region. The possible cause of this result, relating to three-dimensionality in the wake, is briefly discussed.

Type: Article
Title: Fluid forces acting on a cylinder undergoing streamwise vortex-induced vibrations
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jfluidstructs.2016.01.007
Publisher version: http://dx.doi.org/10.1016/j.jfluidstructs.2016.01....
Language: English
Additional information: © 2016. This manuscript version is published under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International licence (CC BY-NC-ND 4.0). This licence allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licences are available at http://creativecommons.org/licenses/by/4.0.
Keywords: Vortex-induced vibrations; Fluid forces; Fluid–structure interaction
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1477168
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