Vortex-induced vibrations of a rigid cylinder on elastic supports with endstops. Part 1: experimental results
Vortex-induced vibrations of a rigid cylinder on elastic supports with endstops. Part 1: experimental results
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
fluid-structure interaction, vortex-induced vibration, nonlinear restraints, impacts
62-78
Bourdier, S.
4595aa49-5844-40a9-b67d-bfd044b82fc7
Chaplin, J.R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
February 2012
Bourdier, S.
4595aa49-5844-40a9-b67d-bfd044b82fc7
Chaplin, J.R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Bourdier, S. and Chaplin, J.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), .
(doi:10.1016/j.jfluidstructs.2011.12.014).
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
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Published date: February 2012
Keywords:
fluid-structure interaction, vortex-induced vibration, nonlinear restraints, impacts
Organisations:
Energy & Climate Change Group
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Local EPrints ID: 336385
URI: http://eprints.soton.ac.uk/id/eprint/336385
ISSN: 0889-9746
PURE UUID: 776ada18-ce12-4e2e-80d3-6ef680dc7054
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Date deposited: 23 Mar 2012 08:34
Last modified: 15 Mar 2024 03:04
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Author:
S. Bourdier
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