Publicações

Fonseca, N. e Guedes Soares, C. (2005), “Comparison between Experimental and Numerical Results of the Nonlinear Vertical Ship Motions and Loads on a Containership in Regular Waves”, International Shipbuilding Progress, Vol. 52, nº1, pp. 57-91.

The paper presents a comparison between experimental data and numerical results of the nonlinear wave induced heave and pitch motions and structural vertical shear forces and bending moments on a containership. The experimental data was obtained from tests with a model of a containership advancing in head regular waves with different steepness, ranging from small to large amplitude waves. Strong nonlinear effects were detected on the experimental data, identified by: the variation of the transfer functions with the wave amplitude, the existence of higher harmonics and the asymmetry of the response records with respect to the positive and negative peaks. The experimental data is compared with numerical results from a nonlinear time domain strip method. The method assumes that the radiation and diffraction hydrodynamic forces are linear and the nonlinear contributions arise from the hydrostatics and Froude-Krilov forces and the effects of green water on deck. The effects of vertical viscous forces due to flow separation are also investigated. The associated forces are represented by a semi-empirical formulation and depend of cross flow drag and lift coefficients.

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