Numerical Evaluation of the Far Field Wave Pattern of the Radiation Green's Function.

摘要

Computer program RADGREEN has been developed to calculate the far field wave pattern of the radiation Green's function corresponding to an oscillating source translating below the free surface. The program has the capability of calculating the Green's function and its derivatives, or the associated wave elevation and slopes. The far field analysis is based on an asymptotic formulation which neglects terms which are of order 1/R and higher. Techniques for removing and attenuating singularities in the formulation and eliminating short noise-like waves are described in some detail. A number of three dimensional and contour plots are given to show sample radiation wave patterns for a single source and for a line of sources whose strengths are adjusted to approximate those for a ship hull undergoing heave or pitch motions. Keywords: Water flow; Ship hulls; Farfield wave pattern; Translating oscillating source. (jhd)