Numerical analysis of current effect on nonlinear wave-body interactions
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Nonlinear wave-current interactions with a freely-floating body are investigated by a 2D fully-nonlinear time-domain Numerical Wave Tank (NWT). The developed NWT is based on Boundary Element Method (BEM) with constant panel discretization technique. Mixed Eulerian-Lagrangian (MEL) free-surface time-simulation scheme (material-node approach) is used with 4 th-order Runge-Kutta fullyupdated time integration, regriding and smoothing techniques on the free surface. An acceleration-potential formulation and direct mode-decomposition method were used. The NWT was utilized to analyze nonlinear wave-current interactions (i) without bodies, and (ii) with a floating body for various wave and current conditions. The NWT results are compared with the results of Boussinesq equation and published results. It is observed that the present nonlinear results reproduce the general trend of linear and perturbation theory in freesurface profiles. The numerical results of floating body case shows that currents can appreciably affect the body motions through the Dopplershift-like phenomena. Copyright 2006 by The International Society of Offshore and Polar Engineers.
PROCEEDINGS OF THE SIXTEENTH (2006) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 3
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