Validation of a global approximation for wave diffraction-radiation in deep water

Abstract

Computations of linear wave loads and second-order mean drift forces for a hemisphere and a freely floating FPSO show that global analytical approximations, given by Wu et al. in 2017, to the local flow components in the Green function and its gradient yield numerical predictions that closely agree with numerical results obtained via a highly-accurate Green function, as well as analytical results for a hemisphere. The computations reported here provide strong evidence that the global analytical approximations, valid within the entire flow region, are sufficiently accurate to compute linear and mean drift wave loads in practice.