Three-dimensional CFD results are presented for the flow over a straight and a deformed horizontal-axis 500 kW wind turbine blade to study the effect of blade flexibility on the power of the wind turbine.The implicit Reynolds averaged Navier-Stokes solver (IMPRANS) based on finite volume nodal point spatial discretisation scheme with dual time stepping approach and Baldwin-Lomax turbulence modeludwas used for the computations. Bent shape due to Aeroelastic effect was computed using off-line coupling of structural model with panel method. Computations were carried out for several wind speeds. Results for designed wind speed of 12 meter per second for both straight and deformed blades are presented here. In general, power output increases due to deformation at most wind speeds except when the speed goes well beyond design wind speed when the power actually decreases.
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