Modeling of flow around a wind rotor HAWT Application to the dynamic stall

The study of a horizontal axis wind turbine (HAWT) subject to operating conditions in the presence of wind is very complex, because the machine is subject to an instantaneous change in velocity and wind direction can lead inevitably turbine blades undergoing dynamic stall. The present work is a two-dimensional numerical simulation of the instantaneous variation of the wind direction relative to the turbine blade, compared to experimental data available in the literature. The effect of varying the angle of incidence of an S809 profile is studied using a URANS approach to predict the stall. The turbulence modeling is performed using the k-ε model and the k-ω SST. FLUENT software is used for the numerical solution of equations URANS. The results show the importance of taking into account the behavior of the unsteady flow analysis in order to obtain an accurate estimate of the aerodynamic loads acting on the turbine.