Wake Flow of Single and Multiple Yawed Cylinders

[+] Author and Article Information
A. Thakur, X. Liu, J. S. Marshall

Department of Mechanical and Industrial Engineering and IIHR—Hydroscience and Engineering, The University of Iowa, Iowa City, IA 52242 Phone: (319) 335-5817, Fax: (319) 335-5669

J. Fluids Eng 126(5), 861-870 (Dec 07, 2004) (10 pages) doi:10.1115/1.1792276 History: Received July 22, 2003; Revised April 12, 2004; Online December 07, 2004
Copyright © 2004 by ASME
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Grahic Jump Location
Photograph and schematic showing the experimental apparatus mounted in the tow tank at 60° yaw
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Flow visualization image showing wake vortices of a yawed cylinder mounted in a wind tunnel (from Ramberg 6)
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Volumetric LIF images showing orientation of wake vortices of cylinders at yaw angles (a) 0°, (b) 30° and (c) 60°. The imaging region is indicated in the sketches below each image, and the towing direction is indicated by an arrow.
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Comparison of experimental data (circles) and quasi-two-dimensional computational results, with mesh 2 (dashed curve) and mesh 3 (solid curve), for vorticity magnitude ωM at the center of the Karman vortices projected into the PIV measurement plane
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Computed contours of (a) axial vorticity ωz*, (b) cross-stream vorticity magnitude ωC, and (c) axial velocity w* for quasi-two-dimensional flow at ReC=300
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PIV data in a horizontal plane at y/d=0.4 for (a) cross-stream velocity component u* and (b) axial velocity component w
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Iso-surface of vorticity magnitude ω*=1.0 obtained from a three-dimensional computation of flow past a single cylinder with 60° yaw angle
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Cylinder horizontal and vertical separation distances for experiments with two cylinders
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Volumetric LIF images showing vortices shed from the upstream cylinder impinging upon the downstream cylinder at (a) 0°, (b) 30°, and (c) 60° yaw angle. The imaging regions are shown in the sketches below the pictures and the towing direction is indicated by an arrow
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Planar LIF image showing core deformation of a wake vortex from the upstream cylinder as it impinges on the downstream cylinder for a case with yaw angle of 30°. The imaging plane is indicated by a dashed line in the figure on the right.
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Time series of vorticity contours for two-dimensional computations of a vortex impinging upon a cylinder with (a) Γ/Ud=1.0, (b) 8.8 (experimental value), and (c) 31
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Dimensionless vorticity component ωMd/UN in a vertical section of the flow oriented parallel to the towing direction for a cylinder at 60° yaw: (a) quasi-two-dimensional computational results and (b) experimental data measured using PIV. The computational results obtained in the cross-sectional plane are projected into the PIV measurement plane, as indicated in the sketch (c). The location of the experimental data is indicated by a dashed rectangle in both (a) and (b).      
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Iso-surface of (a) vorticity magnitude ω*=2 and (b) axial velocity w*=0.87 at times t*=20 (top) and t*=21 (bottom) showing amplification of vortex perturbations when vortices shed from the upstream cylinder impinge on the front face of the downstream cylinder




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