Vortex-induced vibrations of a rigid cylinder on elastic supports with endstops. Part 1: experimental results


Bourdier, Sylvain and Chaplin, John R. (2012) Vortex-induced vibrations of a rigid cylinder on elastic supports with endstops. Part 1: experimental results. Journal of Fluids and Structures, 29, (1), 62-78. (doi:10.1016/j.jfluidstructs.2011.12.014).

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Description/Abstract

This paper describes an experimental investigation into the effect of restricting the vortex-induced vibrations of a spring-mounted rigid cylinder by means of stiff mechanical endstops. Cases of both asymmetric and symmetric restraint are investigated. Results show that limiting the amplitude of the vibrations strongly affects the dynamics of the cylinder, particularly when the offset is small. Fluid-structure interaction is profoundly affected, and the well-known modes of vortex shedding observed with a linear elastic system are modified or absent. There is no evidence of lock-in, and the dominant impact frequency corresponds to a constant Strouhal number of 0.18. The presence of an endstop on one side of the motion can lead to large increases in displacements in the opposite direction. Attention is also given to the nature of the developing chaotic motion, and to impact velocities, which in single-sided impacts approach the maximum velocity of a cylinder with linear compliance undergoing VIV at lock-in. With symmetrical endstops, impact velocities were about one-half of this. Lift coefficients are computed from an analysis of the cylinder’s motion between impacts

Item Type: Article
ISSNs: 0889-9746 (print)
Keywords: fluid-structure interaction, vortex-induced vibration, nonlinear restraints, impacts
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering and the Environment > Civil, Maritime and Environmental Engineering and Science > Energy & Climate Change Group
ePrint ID: 336385
Date Deposited: 23 Mar 2012 08:34
Last Modified: 27 Mar 2014 20:20
URI: http://eprints.soton.ac.uk/id/eprint/336385

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