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Publicações
Rodrigues, J.M. e Guedes Soares, C. (2017), “Froude-Krylov forces from exact pressure integrations on adaptive panel meshes in a time domain partially nonlinear model for ship motions”, Ocean Engineering, . Vol. 139, pp. 169-183
A partially nonlinear time domain model for predicting ship motions is presented with Froude-Krylov forces being calculated on the exact instantaneous wet part of the floating body. An adaptive mesh technique following a quad-tree subdivision and cutting scheme is applied, in order to track the free-surface of the undisturbed wave, and its intersection with the hull, to generate instantaneous wet meshes. Analytical exact pressure integration expressions are evaluated on the, thus formed, wet panel mesh, regarding the undisturbed wave and hydrostatic pressures, which allow for considerably coarse meshes without any loss of accuracy. Diffraction and radiation forces are kept linear with the latter being introduced using linear unit impulse response functions.
Roll decay motions of a navy vessel’s hull, and under head, beam and quartering waves are numerically predicted and compared with published experimental ones, for zero advance speed. The capabilities and limitations of the proposed method, taking into account the specific simulation setup applied, are addressed. The nonlinear formulation in close to resonant roll frequencies is seen to have a major effect on the calculation of response amplitude operators, with amplitude jumping and capsizing being predicted by the model in some cases.
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