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RESEARCH PAPERS

Formation of Vortex Street in Laminar Boundary Layer

[+] Author and Article Information
M. Kiya, M. Arie

Department of Mechanical Engineering, Hokkaido University, Sapporo 060, Japan

J. Appl. Mech 47(2), 227-233 (Jun 01, 1980) (7 pages) doi:10.1115/1.3153647 History: Received February 01, 1978; Revised September 01, 1979; Online July 21, 2009

Abstract

Main features of the formation of vortex street from free shear layers emanating from two-dimensional bluff bodies placed in uniform shear flow which is a model of a laminar boundary layer along a solid wall. This problem is concerned with the mechanism governing transition induced by small bluff bodies suspended in a laminar boundary layer. Calculations show that the background vorticity of shear flow promotes the rolling up of the vortex sheet of the same sign whereas it decelerates that of the vortex sheet of the opposite sign. The steady configuration of the conventional Karman vortex street is not possible in shear flow. Theoretical vortex patterns are experimentally examined by a flow-visualization technique.

Copyright © 1980 by ASME
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