Transactions of Nanjing University of Aeronautics & Astronautics
Special Issue for Wind Turbine
Coupled aerodynamic and hydrodynamic analysis of floating offshore wind turbine using CFD method
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Abstract:
Aiming at the CFD simulation of floating offshore wind turbine in coupled wind–wave domain, the NREL 5 MW wind turbine supported by the OC3-Hywind Spar platform is modeled in STAR-CCM+ software. Based on the RANS equations and RNG k-ε turbulence model, the rotor aerodynamic simulation for wind turbine is conducted. Numerical results show good agreement with NREL data. Taking advantage with VOF method and Dynamic Fluid Body Interaction (DFBI) technology, the dynamic responses of the floating system with mooring lines are simulated under coupled wind-wave sea condition. The free-decay tests for rigid-body degrees of freedom (DOF) in still water and hydrodynamic tests in regular wave are conducted to validate the numerical model through comparing with the results simulated by FAST. Finally, the simulations of the overall FOWT system in coupled wind-wave flow field are carried out. The relationship between the power output and dynamic motion responses of the platform is investigated. The numerical results show that the dynamic response of wind turbine performance and platform motions all vary as the same frequency with inlet wave. During platform motion, power output of wind turbine is more sensitive than thrust force. This study may provide some reference for further research in coupled aero-hydro simulation of FOWT.
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