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Laboratory measurements of vortex-induced vibrations of a vertical tension riser in a stepped current

Laboratory measurements of vortex-induced vibrations of a vertical tension riser in a stepped current
Laboratory measurements of vortex-induced vibrations of a vertical tension riser in a stepped current
This paper presents an initial analysis of measurements of the vortex-induced vibrations of a model vertical tension riser in a stepped current. The riser, 28mm in diameter, 13.12m long and with a mass ratio (mass/displaced mass) of 3.0, was tested in conditions in which the lower 45% of it was exposed to a uniform current at speeds up to 1m/s, while the upper part was in still water. Its response in in-line and transverse directions was inferred from measurements of bending strains at 32 points along its length. Transverse vibrations were observed at modes up to the 8th with individual modal amplitudes up to about 80% of the riser’s diameter. However, in most cases the response included significant contributions from several modes, all at the same frequency. Some evidence was found of lock-in.
0889-9746
3-24
Chaplin, J.R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Bearman, P.W.
cb7ec4b0-5695-4cd2-aa80-dc34609ec3f8
Huera Huarte, F.J.
05edfca8-665c-4537-a9d1-872a5d8158aa
Pattenden, R.J.
53740e3d-70d8-42ae-b568-d73f733bf936
Chaplin, J.R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Bearman, P.W.
cb7ec4b0-5695-4cd2-aa80-dc34609ec3f8
Huera Huarte, F.J.
05edfca8-665c-4537-a9d1-872a5d8158aa
Pattenden, R.J.
53740e3d-70d8-42ae-b568-d73f733bf936

Chaplin, J.R., Bearman, P.W., Huera Huarte, F.J. and Pattenden, R.J. (2005) Laboratory measurements of vortex-induced vibrations of a vertical tension riser in a stepped current. [in special issue: Fluid-Structure and Flow-Acoustic Interactions involving Bluff Bodies] Journal of Fluids and Structures, 21 (1), 3-24. (doi:10.1016/j.jfluidstructs.2005.04.010).

Record type: Article

Abstract

This paper presents an initial analysis of measurements of the vortex-induced vibrations of a model vertical tension riser in a stepped current. The riser, 28mm in diameter, 13.12m long and with a mass ratio (mass/displaced mass) of 3.0, was tested in conditions in which the lower 45% of it was exposed to a uniform current at speeds up to 1m/s, while the upper part was in still water. Its response in in-line and transverse directions was inferred from measurements of bending strains at 32 points along its length. Transverse vibrations were observed at modes up to the 8th with individual modal amplitudes up to about 80% of the riser’s diameter. However, in most cases the response included significant contributions from several modes, all at the same frequency. Some evidence was found of lock-in.

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More information

Published date: November 2005
Organisations: Energy & Climate Change Group

Identifiers

Local EPrints ID: 53799
URI: https://eprints.soton.ac.uk/id/eprint/53799
ISSN: 0889-9746
PURE UUID: d144f5bf-a8ce-4b3e-b3e7-7e8bae350892

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Date deposited: 30 Jul 2008
Last modified: 13 Mar 2019 20:40

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