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Computational fluid dynamics (CFD) studies are carried out on a two-bladedvertical axis wind turbine (VAWT) operating at a wind speed of 8 m/s for thetip speed ratios ($\lambda$) of 0.50 - 3.0. The blade consists of the NACA 0021airfoil with the chord length of 0.265 m and a rotor radius of 1 m. Basicsensitivity studies for various time step sizes are carried out. The resultsare validated against available measurement data from literature. An excellentagreement is obtained for small $\lambda$ up to optimum condition. For thehigher tip speed ratios, the two dimensional CFD computations predict higherresults than the wind tunnel experiment, but they are very similar to the fieldmeasurement data. Wake characteristics are presented in the present studies,showing that the wake becomes Gaussian at 5 times radius downsteam of therotor. It is shown that complex flow phenomena occur due to dynamic stall onsetespecially for the smaller tip speed ratio.

Unsteady Navier-Stokes studies on loads, wake and dynamic stall characteristics of a two-bladed vertical axis wind turbine