ADV measurements of blockage flow effects near a model jacket in waves and current
Archer, A.J. and Wolgamot, H.A. and Orszaghova, J. and Dai, S. and Taylor, P.H. (2024) ADV measurements of blockage flow effects near a model jacket in waves and current. Journal of Fluids and Structures, 125. 104076. ISSN 0889-9746 (https://doi.org/10.1016/j.jfluidstructs.2024.10407...)
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Abstract
Design standards for drag loading on offshore jacket structures do not presently account for the reduction in forces arising from flow blockage effects in the event of combined waves and current. This force reduction is believed to originate in reduced mean flow velocity through the jacket, but this has never been directly measured. To address this, we conducted physical-model tests which measured the flow adjacent to a jacket structure in combined waves and in-line currents using acoustic Doppler velocimeters. Results confirm a dramatic reduction in the mean flow velocity up-wave and down-wave of a model jacket in waves and current, far greater than the flow reduction observed in current alone. These results unambiguously confirm the significant additional blockage (and hence reduction in structural loads) not captured in current offshore design standards.
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Item type: Article ID code: 88156 Dates: DateEvent31 March 2024Published18 January 2024Published Online10 January 2024AcceptedSubjects: Naval Science > Naval architecture. Shipbuilding. Marine engineering Department: Faculty of Engineering > Naval Architecture, Ocean & Marine Engineering Depositing user: Pure Administrator Date deposited: 13 Feb 2024 11:24 Last modified: 07 Aug 2024 02:21 URI: https://strathprints.strath.ac.uk/id/eprint/88156