Momentum and gravity effects during the constant velocity water entry of wedge-shaped sections

Fairlie-Clarke, A. and Tveitnes, T. (2008) Momentum and gravity effects during the constant velocity water entry of wedge-shaped sections. Ocean Engineering, 35(7), pp. 706-716. (doi: 10.1016/j.oceaneng.2006.11.011)

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Publisher's URL: http://dx.doi.org/10.1016/j.oceaneng.2006.11.011

Abstract

Computational fluid dynamics analysis was used to investigate the added mass momentum, flow momentum and gravity effects during the constant velocity water entry of wedge-shaped sections with deadrise angles from 5 degrees to 45 degrees. It is shown that the added mass continues to increase for a time after chine immersion and that added mass can be estimated in terms of a constant added mass coefficient and an effective wetted width. A momentum theory is presented in which the water entry force is explained as the sum of the rate of change of added mass momentum, which becomes zero at immersion to chine depth ratios greater than about three, and the rate of change of flow momentum, which continues at deep immersions. The effect of gravity on the water entry force is given as the hydrostatic force together with the force necessary to create the potential energy in the water pile up. Hydrodynamic forces are not significantly changed by the effect of gravity on the flow fields.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Fairlie-Clarke, Dr Anthony
Authors: Fairlie-Clarke, A., and Tveitnes, T.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Ocean Engineering
Publisher:Pergamon
ISSN:0029-8018
ISSN (Online):1873-5258

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