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Deep water entry of high speed ferry bows


Davis, MR and Lavroff, J and Thomas, GA and Davidson, G, Deep water entry of high speed ferry bows, Proceedings of the 18th Australasian Fluid Mechanics Conference, 3-7 December, Launceston, Tasmania, Australia, pp. 1-4. ISBN 9780646583730 (2012) [Refereed Conference Paper]

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Copyright 2012 Leishman Associates

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High speed multi-hull ferries can experience strong vertical motions near the bow when encountering heavy seas and risk bow damage due to deep entry into encountered waves. The risk of water passing over the top of the bow has been virtually eliminated in the INCAT Tasmania Wave Piercer design which incorporates a centrebow with a keel on or above the waterline. However, confinement of displaced water in the connecting archways to port and starboard of the centre bow leads to large hydrodynamic loads on the bow structure. The time dependant water entry problem for a high speed wave piercer vessel is extremely complicated owing to the relatively complicated form of the bow areas of the hulls. Determination of the hydrodynamic loads which can occur has therefore been based primarily on experimental testing at full scale and at model scale, but CFD methods are also being investigated. As the bow enters an encountered wave, water is at first displaced by the centre bow and ejected over the top of the forward ends of the demi-huills. However as the water entry event develops the rising water surface can ultimately fill the arch cross section and at that stage the hydrodynamic loads can become extremely large. Maximum loads in excess of the total displacement of the vessel (that is in excess of 2500 tonnes at full scale typically) have been observed and have durations of about 0.4 seconds at full scale.

Item Details

Item Type:Refereed Conference Paper
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ship and platform structures (incl. maritime hydrodynamics)
Objective Division:Transport
Objective Group:Water transport
Objective Field:Domestic passenger water transport (e.g. ferries)
UTAS Author:Davis, MR (Professor Michael Davis)
UTAS Author:Lavroff, J (Dr Jason Ali-Lavroff)
UTAS Author:Thomas, GA (Professor Giles Thomas)
ID Code:82615
Year Published:2012
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2013-02-07
Last Modified:2014-08-12
Downloads:2 View Download Statistics

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