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Computation of wet deck bow slam loads for catamaran arched cross sections


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Davis, MR and Whelan, JR 2007 , 'Computation of wet deck bow slam loads for catamaran arched cross sections' , Ocean Engineering, vol. 34, no. 17-18 , pp. 2265-2276 , doi: 10.1016/j.oceaneng.2007.06.001.

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A computational model for catamaran wet deck slamming is developed on the basis of the variation of added mass as the hulls enter the water. In the case of a wave-piercing catamaran the bow cross section has a double arch cross section and slamming occurs when the arches fill. Residual air is entrained at the top of the arch due to bubble formation by turbulent mixing and this modifies the effect of the water added mass on the hull. The computational model therefore introduces a soft connection between the water added mass associated with the slam and the hull. The method has been evaluated by comparison with two-dimensional model drop tests in terms of the maximum forces and acceleration imposed on the hull, the variation of velocity during the slam event and the depth of penetration into the water. It is concluded that the added mass computation is adequate for slam modelling in global motions and loads calculations since it gives a good representation of the maximum total forces on the section and their duration.

Item Type: Article
Authors/Creators:Davis, MR and Whelan, JR
Keywords: Wave slamming; Catamaran; Water entry; Slam loads
Journal or Publication Title: Ocean Engineering
Publisher: Elsevier
ISSN: 0029-8018
DOI / ID Number: 10.1016/j.oceaneng.2007.06.001
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