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THE EFFECTS OF LEADING AND TRAILING EDGE DETAILS ON THE FLOW AROUND ELONGATED BLUFF BODIES

Emanuela Palombi
Boundary Layer Wind Tunnel Laboratory Faculty of Engineering, University of Western Ontario London, Ontario, N6A 5B9, Canada

Gregory A. Kopp
Boundary Layer Wind Tunnel Laboratory and Advanced Fluid Mechanics Research Group Faculty of Engineering Science, University of Western Ontario, London Ontario, N6A 5B9 Canada

Roi Gurka
Department of Mechanical Engineering The Johns Hopkins University Baltimore, MD, 21218, USA; Boundary Layer Wind Tunnel Laboratory Faculty of Engineering, University of Western Ontario London, Ontario, N6A 5B9, Canada; Ben Gurion University, Israel

Sinopsis

The influence of leading and trailing edge geometry on the flows around four elongated cylinders was examined. In particular, the mean flow characteristics around the bodies (including the distance from the leading edge to the reattachment point, the boundary layers thickness at the the trailing edge, the speed-up at the leeward trailing edge) and in the wakes, particularly the details of the vortex streets, were examined. It was found that there is no simple scaling relationship linking the various vortex street parameters such as the spacing ratio, b/a, the vortex convection speeds, and vortex strengths so that there is no universal Strouhal number for these flows. It appears that the diffuse separated shear layers are the main cause of this lack of universality in vortex streets, so that each vortex street depends on the precise way it came to be formed.