University of Tasmania

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

journal contribution
posted on 2023-05-19, 15:32 authored by Babak Shabani, Jason Ali-LavroffJason Ali-Lavroff, Damien HollowayDamien Holloway, Michael DavisMichael Davis, Thomas, GA
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.


Australian Research Council

Incat Tasmania Pty Ltd


Publication title

Journal of Engineering for the Maritime Environment








School of Engineering


Sage Publications Ltd.

Place of publication

United Kingdom

Rights statement

Copyright 2018 IMechE

Repository Status

  • Restricted

Socio-economic Objectives

Domestic passenger water transport (e.g. ferries)