Numerical simulation of focused wave interactions with a fixed FPSO using OpenFOAM 4.1

This paper presents numerical results utilising the open-source C++ libraries of OpenFOAM (Foundation version 4.1) to simulate the interaction of focused wave events with a fixed FPSO-like structure. The Reynolds-Averaged Navier Stokes (RANS) equations are solved using a finite volume approach for two, incompressible, fluids using a volume of fluid (VOF) interface capturing scheme. Wave generation and absorption is achieved via linear superposition of first order wave components, derived from the empty tank data, and the relaxation zone method from the waves2Foam toolbox. Various wave steepness, ranging from ka = 0.13 to 0.21, and incident wave angles, 0, 10 and 20_, are considered. The effect of turbulence is also evaluated through use of the k-ω SST turbulence closure model. The wave run-up and the pressure on the surface of the structure are examined and have been contributed for comparison with both physical and alternative numerical data as part of the CCP-WSI Blind Test Series 1.