Modeling of Flow around FPSO Hull Sections Subject to Roll Motions:Effect of the Separated Flow around Bilge Keels

摘要

The objective of this research is to understand the physics of theseparated unsteady viscous flow over the bilge keels of an FPSO hullsubject to roll motions and to predict the corresponding hydrodynamiccoefficients. A numerical scheme which is based on the Finite VolumeMethod (FVM) for the solution of the 2-D Navier-Stokes equations ispresented (NS2D). The scheme is validated for a submerged hull rollproblem and applied to an FPSO hull subject to roll motions with orwithout bilge keels. The effects of the bilge keel size and orientation on the hydrodynamic coefficients are investigated. Moreover, a Boundary Element Method (BEM) based potential solver is developed in order to investigate the effects of the non-linear free-surface boundary conditions on the predictions.