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Loading on a cylinder in uniform oscillatory flow: Part 1- Planar oscillatory flow

Loading on a cylinder in uniform oscillatory flow: Part 1- Planar oscillatory flow
Loading on a cylinder in uniform oscillatory flow: Part 1- Planar oscillatory flow
Loading on a smooth circular cylinder at high Reynolds numbers in planar oscillatory flow has been studied by driving the cylinder with simple harmonic motion through water initially at rest. The development of the experiment, capable also of arbitrary two dimensional oscillatory motion, is described with particular attention to the steps taken to eliminate undesirable mechanical vibrations. Results are presented over the range of conditions, Reynolds numbers in the range 20,000 to 280,000 and Keulegan Carpenter numbers from 6 to 20. For the lower Keulegan Carpenter numbers, drag and inertia coefficients follow a reasonable extension of Sarpkaya's U-tube data. Comparison with large scale wave experiments highlights the effects of differences between planar oscillatory flow and wave-induced flow. In some respects, however, such as the magnitude of local transverse forces, agreement between measurements in these different conditions are in surprising agreement.

circular cylinder, wave loading, morison's equation, vortex shedding, oscillatory flow
0141-1187
120-128
Chaplin, John R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Chaplin, John R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f

Chaplin, John R. (1988) Loading on a cylinder in uniform oscillatory flow: Part 1- Planar oscillatory flow. Applied Ocean Research, 10 (3), 120-128. (doi:10.1016/S0141-1187(88)80012-9).

Record type: Article

Abstract

Loading on a smooth circular cylinder at high Reynolds numbers in planar oscillatory flow has been studied by driving the cylinder with simple harmonic motion through water initially at rest. The development of the experiment, capable also of arbitrary two dimensional oscillatory motion, is described with particular attention to the steps taken to eliminate undesirable mechanical vibrations. Results are presented over the range of conditions, Reynolds numbers in the range 20,000 to 280,000 and Keulegan Carpenter numbers from 6 to 20. For the lower Keulegan Carpenter numbers, drag and inertia coefficients follow a reasonable extension of Sarpkaya's U-tube data. Comparison with large scale wave experiments highlights the effects of differences between planar oscillatory flow and wave-induced flow. In some respects, however, such as the magnitude of local transverse forces, agreement between measurements in these different conditions are in surprising agreement.

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More information

Published date: July 1988
Keywords: circular cylinder, wave loading, morison's equation, vortex shedding, oscillatory flow

Identifiers

Local EPrints ID: 75189
URI: https://eprints.soton.ac.uk/id/eprint/75189
ISSN: 0141-1187
PURE UUID: 7c569c64-7da8-4555-9d3f-d68cadaae5c2

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Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:44

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Author: John R. Chaplin

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