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Publications
Rajendran, S., Fonseca, N. and Guedes Soares, C. (2016), “Prediction of extreme motions and vertical bending moments on a cruise ship and comparison with experimental data”, Ocean Engineering, Vol. 127, pp. 368-386
The wave induced motions and vertical bending moments induced by extreme seas on a Cruise Ship is investigated numerically and compared with experimental results. Six sea states and extreme wave sequences are derived from the IACS scatter diagram, corresponding to the North Atlantic wave climatology, and they represent the most severe conditions the ship would encounter during a 20 years period operation (IACS International Association of Classification Societies). The ship responses are simulated in the time domain with a body-nonlinear seakeeping code based on strip theory. Two levels of complexity are used and compared: (a) the first assumes that the body-nonlinear effects in the vertical responses are dominated by the hydrostatic and Froude-Krylov components, therefore the related forces are nonlinear, while radiation and diffraction is kept linear (partially body nonlinear method); (b) the second considers all forces as body-nonlinear and they are updated at each time instant during the simulation depending on the hull wetted surface (fully body nonlinear method). The paper presents comparisons of direct time domain simulations with experimental records, as well as probability distribution of maxima. The fully body nonlinear code compares very well with the experiments in extreme wave conditions.
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