Wake Dynamics of a Yawed Cylinder

[+] Author and Article Information
J. S. Marshall

Department of Mechanical and Industrial Engineering and IIHR–Hydroscience and Engineering, University of Iowa, Iowa City, IA 52242e-mail: jeffrey-marshall@uiowa.edu

J. Fluids Eng 125(1), 97-103 (Jan 22, 2003) (7 pages) doi:10.1115/1.1523069 History: Received January 29, 2002; Revised August 08, 2002; Online January 22, 2003
Copyright © 2003 by ASME
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Sketch showing the two modes of nearly parallel vortex shedding for flow past a yawed cylinder of finite length (based on flow visualizations of Ramberg 2)
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Mesh used for discretization of the vorticity field near the cylinder
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Time-variation of drag and lift coefficients for (a) Re=300 and (b) Re=100. Reference drag coefficients compiled by Schlichting 17 are indicated by dashed lines.
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Variation of cross-stream vorticity magnitude on the cylinder surface as a function of azimuthal angle for Re=100 (solid curve) and Re=300 (dashed curve)
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Variation of axial force coefficient with time for cases with Re=100 (solid curve) and Re=300 (dashed curve)
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Vortex lines of the cross-stream vorticity field for a case with t=10, corresponding to the first plot in Fig. 5(a)
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Near-field of the cylinder wake showing (a) cross-stream vorticity magnitude and (b) axial velocity at two different times during the wake oscillation cycle. In (a), contours are shown for ωC=1 and 2, and gray shading indicates regions with ωC>1. In (b), contours are shown for w=0.1, 0.3, 0.5, 0.7, and 0.9, and gray shading indicates regions with w<0.7.
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Contours of (a) axial vorticity, (b) cross-stream vorticity magnitude ωCx2y2, and (c) axial velocity in the cylinder wake for Re=300 at time t=21. In (a), regions are shaded black for ωz<−1.2 and gray for ωz>1.2. In (b), contours are drawn for ωc=0.25 and 0.50, and gray shading indicates ωC>0.50. In (c), contours are drawn for w=0.225, 0.45, 0.675, and 0.9, and gray shading indicates w<0.9.




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