a comparison study of water impact and water exit models
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ID: 138878
2014
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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.
| Reference Key |
alexander2014internationala
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| Authors | ;Korobkin Alexander;Khabakhpasheva Tatyana;Malenica Sime;Kim Yonghwan |
| Journal | current developments in nutrition |
| Year | 2014 |
| DOI |
10.2478/ijnaoe-2013-0238
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