We first demonstrate the potential of cylindrical vortex generators to control the separation over a smoothly curved ramp in a low velocity hydrodynamic channel. We then focus on the influence of a row of four cylindrical vortex generators on a spatially growing flat plate boundary layer. Using two-component PIV measurements, we show how the boundary layer is modulated by counter-rotating streamwise vortices. We also analyze the 3D velocity field using non-linear perturbations to emphasize a clear modification of the base flow. This base flow modification, together with spanwise modulation, can explain the delay of the separation of the boundary layer over the curved ramp.
Base Flow Modification by Streamwise Vortices: Application to the Control of Separated Flows
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Duriez, T, Aider, J, & Wesfreid, JE. "Base Flow Modification by Streamwise Vortices: Application to the Control of Separated Flows." Proceedings of the ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. Volume 2: Fora. Miami, Florida, USA. July 17–20, 2006. pp. 791-796. ASME. https://doi.org/10.1115/FEDSM2006-98541
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