Vortex Shedding Process Investigation Downstream a Surface-Mounted Block

Article type: Research Article

Authors: Calluaud, D. | Davd, L. | Texier, A.

Affiliations: Laboratoire d'Etudes Aérodynamiques (UMR 6609-CNRS) Boulevard Pierre et Marie Curie Téléport 2, B.P. 30179 86960 FUTUROSCOPE POITIERS Cedex, France

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.

Keywords: Wake, Vortex dynamic, Velocimetry, Correlation, Visualization

Journal: Journal of Visualization, vol. 8, no. 2, pp. 99-108, 2005