Fully-Coupled Dynamic Response of a Semi-submerged Floating Wind Turbine System in Wind and Waves

摘要

An Unsteady Actuator Line Model (UALM) is developed in this paperand applied to a 5MW floating offshore wind turbine (FOWT). Thismodel is implemented into two- phase fluid CFD solver, naoeFOAMSJTU.The goal of the approach presented here is to investigate theinteraction of the aerodynamic loads with the platform motion withinacceptable time cost. A semi-submerged floating platformconceptualized in the Offshore Code Comparison Collaboration (OC4)is considered in this paper. Initially the UALM is verified bycomparison with the results of a previous study. Next, two kind of fullsystemsimulations with different complexity are performed: first, thewind forces are simplified into a constant thrust; second, the fullycoupled dynamic analysis with wind and wave excitation is conductedby utilizing UALM. Based on the results, the aerodynamic loads andcoupled responses for cases of different complexity are discussed.