CFD Investigation of 2D and 3D Dynamic Stall

Numerical simulation has been performed for 2-D and 3-D dynamic stall cases. Square wings of NACA 0012 and NACA 0015 sections were employed and results have been compared against experimental data by Wernert et. al. [14] for the 2-D and Schreck and Helin [12] for the 3-D cases. The well-known flow configuration of the 2-D dynamic stall case is present on the symmetry plane of the 3-D cases. Similarities between the 2-D and 3-D cases, however, are restricted on the midspan and the flowfield changes rapidly as the wing-tip is approached. Visualisation of the 3-D calculations revealed the same omega-shaped dynamic stall vortex observed in the experiments by Schreck and Helin [12].

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