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The influence of the centre bow and wet-deck geometry on motions of wave piercing catamarans

Shabani, B; Lavroff, J; Holloway, DS; Davis, MR; Thomas, GA; (2018) The influence of the centre bow and wet-deck geometry on motions of wave piercing catamarans. Journal of Engineering for the Maritime Environment 10.1177/1475090217753761. (In press). Green open access

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Abstract

The effects of tunnel height and centre bow length on the motions of a 112-m wave-piercer catamaran with an above-water centre bow were investigated through model tests. Five alternative centre bow configurations were considered, and multiple series of model tests were conducted in regular head sea waves. The results showed that both heave and pitch increased over a wide range of wave encounter frequency as the wet-deck height of the catamaran model increased. However, increasing the length of the centre bow showed an increase in the pitch but a decrease in the heave for a limited range of wave encounter frequency near the heave and pitch resonance frequencies of the catamaran model. The positions of minimum vertical displacement were found to be aft of the longitudinal centre of gravity, between 20% and 38% of the overall length from the transom. Increase in the wet-deck height and consequently the archway clearance between the main hulls and centre bow also resulted in an increase in the vertical displacement relative to the undisturbed water surface in the centre bow area. The results also indicated the vulnerability to wet-deck slamming for the different bow and wet-deck designs.

Type: Article
Title: The influence of the centre bow and wet-deck geometry on motions of wave piercing catamarans
Open access status: An open access version is available from UCL Discovery
DOI: 10.1177/1475090217753761
Publisher version: http://doi.org/10.1177/1475090217753761
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Maritime systems research/design/development, high speed catamarans, wave piercing catamarans; centre bow and wet deck geometry, motion response to regular waves, relative motion, slamming exposure
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10042733
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