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Publications
Fonseca, N. and Guedes Soares, C. (1998), “Non-Linear Wave Induced Responses of Ships in Irregular Seas”, Proceedings of the 17th International Conference on Offshore Mechanics and Arctic Engineering (OMAE’98), Guedes Soares, C. (Eds.), ASME, New York, Vol. II, Paper OMAE98-0446
The motions and loads induced on ships by large amplitude waves are studied in the time domain. The dominant nonlinearities associated with the large variation of the immersed volume of the ship are taken into account. A practical engineering approach is used to calculate the hydrodynamic forces: while the radiation forces are kept linear and represented by the convolution of memory functions, the buoyancy forces (hydrostatic and Krilov forces) are calculated over the "exact" wetted surface of the ship. Simulations are presented of the wave induced vertical motions and structural loads on a container ship in regular and irregular waves. The importance of the nonlinear behaviour is assessed by comparing the nonlinear results with the corresponding linear ones.
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