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Publications
Ribeiro e Silva, S. and Guedes Soares, C. (2009), “Parametric Rolling of a Container Vessel in Longitudinal Waves”, Proceedings of the 10th International Conference on Stability of Ships and Ocean Vehicles (STAB´09), 22-26 June, St. Petersburg, Russia, pp. 597-608
A time domain numerical simulation of ship motion in six degrees of freedom is proposed to detect parametric rolling in both regular and irregular longitudinal waves. An investigation into the dynamic stability in waves of a container vessel is made and compared with experimental data. The basic approach of the simulation program involves computation of hydrodynamic coefficients of added mass and damping, restoring coefficients and diffraction and Froude-Krylov excitation forces at each step in time according to the instantaneous waterline and vessel position, using a strip theory method and a pressure integration technique along segments. This article briefly describes the computational technique utilized and makes comparisons between numerical and experimental data on parametric rolling obtained to infer about the levels of fidelity of the proposed methodology. At the end some recommendations are presented to mitigate parametric rolling in actual sea waves.
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