Computational Investigations of Deploying Load Control Microtabs on a Wind Turbine Airfoil

Flow about a wind turbine airfoil with a deploying microtab device has been numerically simulated by solving unsteady turbulent compressible two-dimensional, Navier-Stokes equations with the OVERFLOW 2 solver. Using a Chimera/overset grid topology, microtabs were placed at 95% of chord of a S809 airfoil. Microtab heights on the order of 1% of chord, deployed on the order of one (1) characteristic time unit were utilized. The effects of freestream angle of attack on the aerodynamic response was also investigated. Validation studies with experimental results for static deployed microtabs and a dynamically deployed spoiler were also performed to ensure accurate temporal and spatial resolution of the numerical simulations.

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