A Numerical Study on the Behavior of a Single Point Moored FSRU and STS moored Vessels

Abstract

A numerical study on the behavior of a floating structure with an internal turret and catenary mooring system, STS(Ship To Ship) moored vessels was carried out. Time-domain analysis was applied in order to investigate the motion characteristics of floating bodies and structural responses of mooring lines, connectors. In the analysis, the motion of floating structures was calculated by using convolution integral with the retardation function. High-order boundary element method (HOBEM) was utilized to calculate hydrodynamic coefficients. Catenary mooring lines were modelled as nonlinear beam based on finite element method. Connectors - mooring ropes, mooring springs and fenders &#8211 were modelled as linear springs. Firstly, one floater case with a single point mooring was simulated. Then, two floaters cases with a STS configuration were calculated in the operation condition. Numerical results were compared with experimental data, though small discrepancies were observed in planar motions.tics of floating bodies and structural responses of mooring lines, connectors. In the analysis, the motion of floating structures was calculated by using convolution integral with the retardation function. High-order boundary element method (HOBEM) was utilized to calculate hydrodynamic coefficients. Catenary mooring lines were modelled as nonlinear beam based on finite element method. Connectors - mooring ropes, mooring springs and fenders &#8211 were modelled as linear springs. Firstly, one floater case with a single point mooring was simulated. Then, two floaters cases with a STS configuration were calculated in the operation condition. Numerical results were compared with experimental data, though small discrepancies were observed in planar motions.