Abstract
This paper describes extensive computer-based analytical studies on the details of unsteady flow behavior around the airfoils subjected flow induced vibration. A comparison was made between the two- and three-dimensional analyses for flow around a NACA0012 airfoil, and the separation vortex structure was examined in detail. From the numerical results, it was found that the separation vortex consisted of large-scale rolls with axes in the span direction, and rib substructures with axes in the stream direction. The three-dimensional analysis could simulate these rolls and ribs, but the two-dimensional analysis was inadequate to examine this vortex structure.
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