A comparison study of water impact and water exit models

Korobkin, Alexander, Khabakhpasheva, Tatyana, Malenica, Sime and Kim, Yonghwan (2014) A comparison study of water impact and water exit models. International Journal of Naval Architecture and Ocean Engineering, 6 (4). pp. 1182-1196. ISSN 2092-6782

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Abstract

In problems of global hydroelastic ship response in severe seas including the whipping problem, we need to know the hydrodynamic forces acting on the ship hull during almost arbitrary ship motions. In terms of ship sections, some of them can enter water but others exit from water. Computations of nonlinear free surface flows, pressure distributions and hydrodynamic forces in parallel with the computations of the ship motions including elastic vibrations of the ship hull are time consuming and are suitable only for research purposes but not for practical calculations. In this paper, it is shown that the slamming forces can be decomposed in two components within three semi-analytical models of water entry. Only heave motion is considered. The first component is proportional to the entry speed squared and the second one to the body acceleration. The coefficients in these two components are functions of the penetration depth only and can be precomputed for given shape of the body. During the exit stage the hydrodynamic force is proportional to the acceleration of the body and independent of the body shape for bodies with small deadrise angles.

Item Type: Article
Additional Information: © Society of Naval Architects of Korea. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)
Uncontrolled Keywords: force decomposition,semi-analytical models of slamming,water exit,control and systems engineering,ocean engineering ,/dk/atira/pure/subjectarea/asjc/2200/2207
Faculty \ School: Faculty of Science > School of Mathematics
Related URLs:
Depositing User: Pure Connector
Date Deposited: 23 Jun 2016 23:11
Last Modified: 22 Apr 2020 00:55
URI: https://ueaeprints.uea.ac.uk/id/eprint/59549
DOI: 10.2478/IJNAOE-2013-0238

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