Loading on a vertical cylinder in multidirectional waves

Chaplin, J.R., Subbiah, K. and Irani, M. (1995) Loading on a vertical cylinder in multidirectional waves Journal of Offshore Mechanics and Arctic Engineering, 117, (3), pp. 151-158. (doi:10.1115/1.2827083).


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This paper presents laboratory measurements of local and total loading on an isolated vertical cylinder in irregular unidirectional and multidirectional waves. Maximum Keulegan-Carpenter numbers in individual waves were about 16, and maximum Reynolds numbers about 3 × 104. It is shown that in these conditions, existing theoretical and numerical models underestimate the reduction in loading on a cylinder due to wave spreading. Besides the changes that are predicted when Morison's equation is used with constant coefficients, there are hydrodynamic influences that contribute further force reductions. Comparisons with Dean's (1977) hybrid approach suggest that in the present conditions these reductions are in the region of 3 and 6 percent for a spreading function cos2s , with s = 8 and s = 2, respectively. Larger reductions can be expected at higher Keulegan-Carpenter numbers, though scale effects are likely to become more important in the drag-dominated regime.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1115/1.2827083
ISSNs: 0892-7219 (print)
ePrint ID: 75398
Date :
Date Event
August 1995Published
Date Deposited: 11 Mar 2010
Last Modified: 18 Apr 2017 20:43
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/75398

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