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Large scale horizontal cylinder forces in waves and currents

Large scale horizontal cylinder forces in waves and currents
Large scale horizontal cylinder forces in waves and currents
This paper describes laboratory measurements of forces and pressures on smooth and rough horizontal cylinders of diameters 0.21m and 0.5m beneath waves of heights up to 1.9m, in the presence of currents up to Im/s in either direction. Drag and inertia coefficients evaluated on a wave-by-wave basis exhibited very wide scatter, but average values over all Keulegan Carpenter numbers were found insensitive to currents and gave predictions of the largest peak horizontal forces to within 16% of the measurements in 90% of cases in irregular waves. Vertical forces deviated much more strongly from Morison predictions owing to vortex shedding, and to slowly-varying forces due to the Magnus effect associated with wave-induced circulation.

0141-1187
211-224
Chaplin, J.R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Subbiah, K.
e8893cfa-ba26-488c-a82e-56e0aebdaa3f
Chaplin, J.R.
d5ed2ba9-df16-4a19-ab9d-32da7883309f
Subbiah, K.
e8893cfa-ba26-488c-a82e-56e0aebdaa3f

Chaplin, J.R. and Subbiah, K. (1998) Large scale horizontal cylinder forces in waves and currents. Applied Ocean Research, 19 (3-4), 211-224. (doi:10.1016/S0141-1187(97)00021-7).

Record type: Article

Abstract

This paper describes laboratory measurements of forces and pressures on smooth and rough horizontal cylinders of diameters 0.21m and 0.5m beneath waves of heights up to 1.9m, in the presence of currents up to Im/s in either direction. Drag and inertia coefficients evaluated on a wave-by-wave basis exhibited very wide scatter, but average values over all Keulegan Carpenter numbers were found insensitive to currents and gave predictions of the largest peak horizontal forces to within 16% of the measurements in 90% of cases in irregular waves. Vertical forces deviated much more strongly from Morison predictions owing to vortex shedding, and to slowly-varying forces due to the Magnus effect associated with wave-induced circulation.

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More information

Published date: April 1998

Identifiers

Local EPrints ID: 188877
URI: https://eprints.soton.ac.uk/id/eprint/188877
ISSN: 0141-1187
PURE UUID: 8ce13a0e-d86c-4bc9-9408-d296d3298669

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Date deposited: 13 Jun 2011 13:52
Last modified: 18 Jul 2017 11:41

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