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Hydrodynamic damping of a cylinder at B-10(6)

Hydrodynamic damping of a cylinder at B-10(6)
Hydrodynamic damping of a cylinder at B-10(6)
This paper describes delicate, but large-scale, experiments aimed at measuring the hydrodynamic damping of a circular cylinder oscillating in still water and transversely in a current. Attention is concentrated on the regime of very small Keulegan–Carpenter numbers, in which the drag coefficient is inversely proportional to the Keulegan–Carpenter number. Measurements in still water at ?=650 000 and 1250 000 point to drag coefficients about twice those appropriate to two-dimensional laminar flow, in common with earlier measurements at ??105. In the presence of a slowly varying transverse current (generated by placing the cylinder at the node of standing waves of long period), the damping increased with the reduced velocity of the ambient flow at a rate that increased with the Reynolds number.
0889-9746
1101-1117
Chaplin, J. R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Chaplin, J. R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f

Chaplin, J. R. (2000) Hydrodynamic damping of a cylinder at B-10(6). Journal of Fluids and Structures, 14 (8), 1101-1117. (doi:10.1006/jfls.2000.0318).

Record type: Article

Abstract

This paper describes delicate, but large-scale, experiments aimed at measuring the hydrodynamic damping of a circular cylinder oscillating in still water and transversely in a current. Attention is concentrated on the regime of very small Keulegan–Carpenter numbers, in which the drag coefficient is inversely proportional to the Keulegan–Carpenter number. Measurements in still water at ?=650 000 and 1250 000 point to drag coefficients about twice those appropriate to two-dimensional laminar flow, in common with earlier measurements at ??105. In the presence of a slowly varying transverse current (generated by placing the cylinder at the node of standing waves of long period), the damping increased with the reduced velocity of the ambient flow at a rate that increased with the Reynolds number.

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Published date: November 2000

Identifiers

Local EPrints ID: 73997
URI: http://eprints.soton.ac.uk/id/eprint/73997
ISSN: 0889-9746
PURE UUID: 9205a723-b30b-4769-a63b-87e72d50c7f8

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Date deposited: 11 Mar 2010
Last modified: 19 Jul 2019 23:40

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