The Effects of Roughness and Shear on Vortex Shedding Cell Lengths Behind a Circular Cylinder

[+] Author and Article Information
D. M. Rooney, R. D. Peltzer

Aerospace and Ocean Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Va. 24061

J. Fluids Eng 104(1), 72-80 (Mar 01, 1982) (9 pages) doi:10.1115/1.3240860 History: Received July 07, 1980; Online October 26, 2009


Circular cylinders of aspect ratio L/D=17 were tested in a wind tunnel under a wide range of spanwise upstream velocity shears. The correlation between upstream shear, characterized by a nondimensional shear parameter β, and the spanwise lengths of constant vortex shedding frequency was sought for both smooth and rough cylinders in transitional Reynolds numbers flows. Among the significant conclusions are that the spanwise range in shedding frequencies decreases with increasing roughness, the average constant shedding frequency cell length increases with increasing roughness for constant shear, and the average cell length decreases with increasing upstream shear for constant roughness.

Copyright © 1982 by ASME
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