WADA1: FORTRAN Program for Wave Diffraction Analysis Version 1

摘要

This Canadian document describes the FORTRAN computer program WADA1 (WAve Diffraction Analysis-version 1) developed as part of on-going research to analyze the interactions of ocean waves with marine vehicles. WADA1 calculates the hydrodynamic pressure induced by an incident sinusoidal wave and diffracted wave on arbitrary-shaped two-dimensional cylinders fixed in the free surface of deep water. WADA1 solves the linear diffraction problem by the source-distribution model. It uses the Green function that is a particular fundamental solution of the two-dimensional Laplace equation and directly satisfies the boundary conditions on the free surface, on the sea bottom, and at infinity. The amount of required input data is minimal since only the boundary condition on the body surface remains to be satisfied; however, the computation of the Green function and its gradient is complicated. Also the method fails to give a unique solution at irregular frequencies, but these usually occur outside the range of frequency of practical interest. Keywords: Surface waves; Regular waves; Floating body; Linear theory; Strip theory; Diffraction pressure. (kr)