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The loading on a cylinder in post-critical flow beneath periodic and random waves

The loading on a cylinder in post-critical flow beneath periodic and random waves
The loading on a cylinder in post-critical flow beneath periodic and random waves
A major problem encountered in model testing of offshore structures in wave tanks is the difficulty of extrapolating fluid loading on tubular members to full scale conditions. It is well known that in steady flow the drag of a circular cylinder undergoes large changes over the Reynolds number range Re = 10E5. - 10E6. Measurements are presented of the in-line transverse loads on a small element of a vertical and horizontal cylinder in waves at Keulegan Carpenter numbers up to 20 and Reynolds numbers up to 5 x 10E5.. Drag and inertia coefficients are calculated for the vertical cylinder and Morison's equation is found to give a good fit to the measured in-line force. Large transverse forces indicate the presence of strong vortex shedding at post-critical Reynolds numbers. Measurements in regular waves and random waves are found to give similar values of rms force coefficients. Vortex shedding is triggered in random waves when the Keulegan Carpenter number exceeds 7. In both orientations the cylinder loads show little influence of water particle orbit shape. Morison's equation fails to fit the horizontal cylinder data due to the presence of a strong vortex shedding component.
213-226
National Academy of Sciences, Engineering, and Medicine
Bearman, P.W.
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Chaplin, J.R.
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Graham, J.G.
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Kostense, J.K.
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Klopman, G.
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Bearman, P.W.
cb7ec4b0-5695-4cd2-aa80-dc34609ec3f8
Chaplin, J.R.
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Graham, J.G.
313d640a-9271-490e-8a4b-2fb4ee538546
Kostense, J.K.
7b438c57-bd79-445e-bb74-629c9bb45235
Klopman, G.
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Bearman, P.W., Chaplin, J.R., Graham, J.G., Kostense, J.K. and Klopman, G. (1985) The loading on a cylinder in post-critical flow beneath periodic and random waves. In Proceedings of the 4th International Conference on Behaviour of Offshore Structures, held Delft, The Netherlands, 1-5 July 1985. National Academy of Sciences, Engineering, and Medicine. pp. 213-226 .

Record type: Conference or Workshop Item (Paper)

Abstract

A major problem encountered in model testing of offshore structures in wave tanks is the difficulty of extrapolating fluid loading on tubular members to full scale conditions. It is well known that in steady flow the drag of a circular cylinder undergoes large changes over the Reynolds number range Re = 10E5. - 10E6. Measurements are presented of the in-line transverse loads on a small element of a vertical and horizontal cylinder in waves at Keulegan Carpenter numbers up to 20 and Reynolds numbers up to 5 x 10E5.. Drag and inertia coefficients are calculated for the vertical cylinder and Morison's equation is found to give a good fit to the measured in-line force. Large transverse forces indicate the presence of strong vortex shedding at post-critical Reynolds numbers. Measurements in regular waves and random waves are found to give similar values of rms force coefficients. Vortex shedding is triggered in random waves when the Keulegan Carpenter number exceeds 7. In both orientations the cylinder loads show little influence of water particle orbit shape. Morison's equation fails to fit the horizontal cylinder data due to the presence of a strong vortex shedding component.

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More information

Published date: July 1985
Venue - Dates: 4th International Conference on Behaviour of Offshore Structures, Netherlands, 1985-07-01 - 1985-07-05

Identifiers

Local EPrints ID: 75417
URI: http://eprints.soton.ac.uk/id/eprint/75417
PURE UUID: df72eadd-866b-47e3-a4b1-68fd578fc790

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Date deposited: 11 Mar 2010
Last modified: 22 May 2020 16:32

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Contributors

Author: P.W. Bearman
Author: J.R. Chaplin
Author: J.G. Graham
Author: J.K. Kostense
Author: G. Klopman

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