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Loading on a cylinder in uniform oscillatory flow: Part II - elliptical orbital flow

Loading on a cylinder in uniform oscillatory flow: Part II - elliptical orbital flow
Loading on a cylinder in uniform oscillatory flow: Part II - elliptical orbital flow
Loading on a smooth circular cylinder at high Reynolds numbers in elliptical orbital flow has been studied by driving the cylinder around elliptical paths through water initially at rest. This experiment reproduces some of the essential features of the flow around horizontal cylinders beneath waves, though like the planar oscillatory flow simulation for vertical cylinders, some important differences remain. Results are presented for Reynolds numbers in the range 70,000 to 222,000, Keulegan Carpenter numbers between 6 and 20, and ellipticities between zero (planar oscillatory flow) and unity (circular orbital flow). In almost all cases both drag and inertia forces diminish with increasing ellipticity. The change in the total loading is associated mainly with a reduction in the inertia coefficient, ascribed to the generation of circulation around the cylinder. Comparisons with measurements on a horizontal or vertical cylinder in waves in similar conditions suggest (possibly owing to the absence of any current) that the effect of ellipticity is rather stronger in tests in oscillatory uniform flow than in wave flows.
circular cylinder, wave loading, horizontal cylinder, morison's equation, vortex shedding, oscillatory flow, orbital flow
0141-1187
199-206
Chaplin, John R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Chaplin, John R.
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Chaplin, John R. (1988) Loading on a cylinder in uniform oscillatory flow: Part II - elliptical orbital flow. Applied Ocean Research, 10, 199-206.

Record type: Article

Abstract

Loading on a smooth circular cylinder at high Reynolds numbers in elliptical orbital flow has been studied by driving the cylinder around elliptical paths through water initially at rest. This experiment reproduces some of the essential features of the flow around horizontal cylinders beneath waves, though like the planar oscillatory flow simulation for vertical cylinders, some important differences remain. Results are presented for Reynolds numbers in the range 70,000 to 222,000, Keulegan Carpenter numbers between 6 and 20, and ellipticities between zero (planar oscillatory flow) and unity (circular orbital flow). In almost all cases both drag and inertia forces diminish with increasing ellipticity. The change in the total loading is associated mainly with a reduction in the inertia coefficient, ascribed to the generation of circulation around the cylinder. Comparisons with measurements on a horizontal or vertical cylinder in waves in similar conditions suggest (possibly owing to the absence of any current) that the effect of ellipticity is rather stronger in tests in oscillatory uniform flow than in wave flows.

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More information

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

Identifiers

Local EPrints ID: 75401
URI: https://eprints.soton.ac.uk/id/eprint/75401
ISSN: 0141-1187
PURE UUID: 12b293b0-1520-4a53-9251-bf98dfc38548

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Date deposited: 11 Mar 2010
Last modified: 08 Oct 2017 23:12

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