Quantifying the Predictive Capability of OpenFOAM 4.1: Focused Wave Interactions with a Fixed FPSO

Abstract

Numerical simulations of focused wave interactions with a fixed FPSO-like structure are presented, representing an individual contribution to the CCPWSI Blind Test Series 1 in which they are compared against both physical and alternative numerical solutions. The model is based in OpenFOAM with wave generation achieved via linear superposition of first order wave components, derived from the empty tank data. This work focuses on comparing the ‘blind’ estimation of accuracy, based on reproduction of physical empty tank data (released prior to submission to the blind test), with the observed error in wave run-up and pressure on the bow of the structure (following the release of the complete physical data set). The results imply that achieving a good reproduction of surface elevation based on the empty tank data does not necessarily correlate with good agreement when a structure is present.