Abstract
A boundary element method is developed for the 3-D non-linear water wave problems. Triangular panels are used which can represent general 3-D shapes easily and accurately. All the variables are linearly approximated on each panel. The non-linear free surface conditions are satisfied by finite difference approximation. The finite difference calculation is carried out in a mesh system which is finer than that used for the boundary element calculation. A new condition for the downstream open boundary is proposed. After several pilot computations for accuracy analysis, the waves and forces of a submerged sphere and a submerged ship-like body are calculated. Through the comparisons of the results with the analytical solution and those of experiment, it is found that the present method is accurate and efficient.
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