Lifting surfaces such as airfoils and wings undergoing rapid unsteady motion sometimes beyond static stall angle experience extreme unsteady aerodynamic loading. The Applied Fluids Research Group is interested in understanding such aerodynamic loads during both unsteady flow separation (see figure below for some previous results) and flow reattachment. In particular we are interested in such phenomenon occurring on rotating blades that are also simultaneously pitching. One of topics of interest to our research group is the development of flow diagnostics capable of measuring the flow field in the rotating frame of reference.
Streamline plots overlaid on normalized radial velocity contours illustrating variation of the flow with advance ratio over a simultaneously rotating and pitching rotor blade undergoing dynamic stall. Link to full paper