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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

KINEMATICS OF ENGULFMENT IN A TURBULENT WAKE

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

Francesc Giralt
Department d'Enginyeria Quimica University of Rovira i Virgili 43006 Tarragona, Catalunya Spain

Josep A. Ferre
Department of Mechanical Engineering, University Rovira i Virgili, Av. Paisos Catalans, 26, 43007 Tarragona, Spain

James F. Keffer
Department of Mechanical and Industrial Engineering, University of Toronto 5 King's College Road, Toronto, Ontario, M5S 1A4, Canada

Abstract

Hot-wire measurements were made simultaneously in two homogeneous, "horizontal" planes in the far wake region of a cylinder. A technique to identify the spatial characteristics of the large scale bulges at the interface between the internal turbulent motions and the external irrotational flow was developed. Together with the hot-wire data, this technique allowed us to relate unambiguously the outer bulges to the inner coherent structures. Other kinematic features of the engulfment process such as the relative positioning of critical points and the primary locations of inflow to the wake were described.