Numerical Analysis of Aerodynamic Characteristics of Floating Offshore Wind Turbine in Focused Waves
In this paper,the hydrodynamic motion response and aerodynamic characteristics of floating offshore wind turbine(FOWT)under extreme sea conditions are analyzed based on computational fluid dynamic method.Firstly,a method for generating focused wave by two parameters PM spectrum method has been developed in our own code FOWT-UALM-SJTU which is based on opensource software OpenFOAM.The results of numerical simulation have a good agreement with experiment.Following this,the OC3 Spar floating platform with NREL 5 MW wind turbine is simulated in two focused wave conditions by integrated coupling calculation of aero-hydrodynamics and mooring.The analysis focuses on the hydrodynamic motion response and aerodynamic performance.The results indicate that the focused wave induces significant responses in the pitch and heave motions,leading to a significant reduction in the aerodynamic attack angle of the turbine blades spanwise at focusing moment.Besides,the aerodynamic power and thrust of the turbine are challenging to recover within a short duration.Additionally,the focusing effect causes fluctuations in the wake center and boundary and enlarges the velocity deficit region in the wake zone under extreme wave conditions,which is not beneficial for downstream wind turbines.
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