Abstract
The laminar flow around a surface-mounted block is investigated by visualizations and PIV measurements. Flow topology and, especially, the vortex shedding dynamics are emphasized. The existence of two vortex shedding processes is highlighted by particles visualizations and instantaneous velocity fields analyses. On one hand, a dominant swirling mechanism with vortex matching process and a symmetrical topology sets up and, on the other hand, a non periodical evolution with a dissymmetric topology exist. In order to inquire about those processes, double velocity correlation functions are calculated and from those new data the space and time evolutions of the vortices are detailed.
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Damien Calluaud: He received his Fluid Mechanic Ph.D. in 2003 at the Poitiers University (France). He works in the Aerodynamic Laboratory of Poitiers. His research interests are three component velocity technique and algorithm developments by PIV , quantitative visualization, topology analyses, unsteady
Laurent David: He is an Assistant Professor in Fluid Mechanics, and he develops for the L.E.A. optical measurements. His research topics are some experimental investigations of near wake flows and cross flows for aerodynamic and combustion applications. He teaches at the Institute of Technology of Poitiers.
Alain Texier: He is a Full Professor in Fluid Mechanic and a Director of the Technological Institute of Poitiers (France). His main team research topics in the Aerodynamic Laboratory of Poitiers are experimental fluid simulations, topology and dynamic wake understanding and control.
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Calluaud, D., David, L. & Texier, A. Vortex shedding process investigation downstream a surface-mounted block. J Vis 8, 99–108 (2005). https://doi.org/10.1007/BF03181652
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DOI: https://doi.org/10.1007/BF03181652