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The aerodynamic simulation of an NREL-5MW baseline wind turbine is conducted. The three-dimensional Reynolds Averaged Navier-Stokes equations (RANS) are solved, and the k-ω SST turbulence model is used. The in-house code naoe-FOAM-os-SJTU solver based on OpenFOAM and overset grid technique is employed. The wave-wind interaction is studied first. The interaction between wind flow and with wave surface reduces the wind speed below certain height, and a shear wind model is obtained and employed as the non-uniform inflow wind for the unsteady aerodynamic simulation of wind turbine. The aerodynamic simulations of the 5-MW baseline wind turbine under uniform or non-uniform inflow wind are conducted respectively. With shear inflow wind, when the lower-speed layer overlaps the rotating region of turbine blades, the aerodynamic forces on turbine rotor oscillate with 1/3 rotating period.

 

aerodynamic simulation; offshore wind turbine (OWT); overset grid technique; naoe-FOAM-os-SJTU solver