Prediction of Wave Drift Damping by a Higher Order BEM

概要

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The paper develops a numerical method for predicting wave drift damping of three dimensional bodies. The first order potentials are calculated by a new integral equation method, in which the second derivatives of the steady potential has been removed from the integration on the free surface. The second order mean potential is calculated by an integral equation method which is firstly proposed and implemented. Comparison is made with analytic solution for a uniform cylinder. Numerical examinations are made on the convergence with radius of the mesh on the free surface, and magnitude of each component of wave drift damping. Timman-Newman relation is also used to check the correction of the first order potentials. Comparison with experimental results is made on an array of four cylinders which are restrained and freely moving respectively. It was found that good agreements exist between the present calculation and experimental results and negative wave damping may occur at some wave frequencies.
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