Journal
INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING
Volume 6, Issue 4, Pages 1182-1196Publisher
SOC NAVAL ARCHITECTS KOREA
DOI: 10.2478/IJNAOE-2013-0238
Keywords
Semi-analytical models of slamming; Force decomposition; Water exit
Categories
Funding
- NICOP research grant Fundamental Analysis of the Water Exit Problem [N62909-13-1-N274]
- FP7 project SMAES Smart Aircraft in Emergency Situations [FP7-266172]
- FP7 project TULCS [FP7-234146]
- National Research Foundation of Korea (NRF) - Korea Government (MEST) through GCRC-SOP [2011-0030013]
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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.
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