Abstract
In advance of building moored floating offshore platforms, in recent years, there has been a greater demand for two-way coupled simulations between a motion solver based on the viscous flow theory and a mooring line model, including cable dynamics. This paper introduces open-source libraries such as MoorDyn (the lumped-mass mooring line model) and OpenFOAM (the computational fluid dynamics libraries). It describes the methods by which they can be coupled bi-directionally. In each time step, the platform motions calculated by OpenFOAM are transferred to MoorDyn as the boundary conditions for the mooring system analysis. In contrast, MoorDyn calculates the restoring force and moment due to the mooring system and transfers them to OpenFOAM. The restoring force and moment act on the platform as the external force and moment for the platform motions in the next time step. The static tension and profile of the mooring system, dynamic tension of the mooring system, and free decay motions of the floating buoy in the still water were simulated to check the accuracy of OpenFOAM and MoorDyn. The coupled solver was used to produce simulations of the moored decay motions of the floating buoy in the still water and the moored motions with the Stokes 5th order wave. All simulation results were compared and showed good agreement with the numerical solution and experiment results. In addition, the characteristics of each solver were investigated.
Highlights
As land resources have become depleted, human efforts to develop new resources have turned to the oceans and have moved beyond the shallow and deep seas into the ArcticOcean
This has led to the emergence of offshore structures such as Tension Leg Platform (TLP), SPAR, and Floating Production Storage Offloading (FPSO)
Masciola et al [1] conducted a coupled simulation using Fatigue, Aerodynamics, Structures, and Turbulence (FAST) code developed by the National Renewable Energy Laboratory (FAST) and commercial mooring system analysis code OrcaFlex based on the lumped-mass model to investigate the effects of the mooring system on the motions of the semisubmersible floating offshore wind turbine (FOWT) model DeepCwind
Summary
As land resources have become depleted, human efforts to develop new resources have turned to the oceans and have moved beyond the shallow and deep seas into the Arctic. Masciola et al [1] conducted a coupled simulation using Fatigue, Aerodynamics, Structures, and Turbulence (FAST) code developed by the National Renewable Energy Laboratory (FAST) and commercial mooring system analysis code OrcaFlex based on the lumped-mass model to investigate the effects of the mooring system on the motions of the semisubmersible floating offshore wind turbine (FOWT) model DeepCwind. Tran and Kim [8] conducted a fully coupled analysis, including the aerodynamics of turbine rotor blades, hydrodynamics of semisubmersible turbine base, and mooring system for the DeepCwind FOWT model They used the all-purpose commercial CFD code STAR-CCM+ based on the finite volume method and quasi-static catenary mooring model.
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