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INFLUENCE OF UNEQUAL STRENGTH OPPOSING SHEAR LAYERS ON EVOLUTION PROCESS OF KARMAN VORTEX STREET

Adriana L. Csiba
Department of Mechanical and Materials Engineering, The University of Western Ontario London, Ontario, Canada

Robert J. Martinuzzi
Department of Mechanical and Manufacturing Engineering Schulich School of Engineering, University of Calgary 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4

Abstract

The influence of unequal strength opposing shear layers on the vortex formation process and coherent wake structure in the near-wake region of a triangular cylinder is experimentally investigated. Phase-averaged Laser Doppler Velocimetry measurements were made in the wake of a triangular cross-section cylinder for a Reynolds number of 22 500. The relative intensity of the shear layers was adjusted through the angle of incidence, α. The influence α on the flow characteristics, specifically the shedding frequency and surface pressure distribution, was also studied. It is shown that even a mild difference in the strength of the shear layers can significantly modify the structure of the wake and shed vortices.