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TECHNICAL PAPERS

Vortex-Induced Vibration Characteristics of Two Fixed-Supported Elastic Cylinders

[+] Author and Article Information
Z. J. Wang, Y. Zhou, R. M. C. So

Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

J. Fluids Eng 125(3), 551-560 (Jun 09, 2003) (10 pages) doi:10.1115/1.1568360 History: Received March 13, 2002; Revised September 15, 2002; Online June 09, 2003
Copyright © 2003 by ASME
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Figures

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Experimental arrangement
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Variation of εy,rms and εx,rms with Ur: (a) T/d=3.00; (b) T/d=1.70; (c) T/d=1.13. ○, εy,rms, Cylinder 1; •, εy,rms, Cylinder 2; ▵, εx,rms, Cylinder 1; ▴, εx,rms, Cylinder 2.
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Power spectra Eεy (upper plate: Cylinder 1; middle plate: Cylinder 2) of the strain εy and Eu (lower plate) of the streamwise velocity u at T/d=1.7. (a) Ur≈16,Re=3900, where fs*(≈0.3)≈fy(3)*; (b) Ur≈48,Re=11000, where fs*(≈0.1)≈fy(3)*. The hot wire was located at x/d=2 and y/d=1.5.
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Power spectra Eεy (upper plate: Cylinder 1; middle plate: Cylinder 2) of the strain εy and Eu (lower plate) of the streamwise velocity u at T/d=3.0.Ur≈26,Re=6200, where fs*(≈0.2)≈fy(3)*. The hot wire was located at x/d=2 and y/d=1.5.
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Power spectra Eεy (upper plate: Cylinder 1; middle plate: Cylinder 2) of the strain εy and Eu (lower plate) of the streamwise velocity u at T/d=1.13.Ur≈48,Re=11000, where fs*(≈0.1)≈fy(3)*. The hot wire was located at x/d=2 and y/d=1.5.
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Laser-illuminated flow visualization in the water tunnel behind two side-by-side cylinders. (a) T/d=3.0; (b) 1.7; (c) 1.13. Re=450. Flow is from left to right.
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Spectral phase Φ12 between εy1 and εy2(Ur=16,Re=3900): (a) T/d=3.00, (b) 1.70, (c) 1.13
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Power spectrum Eu of the hot-wire signals simultaneously measured in the two outer shear layers associated with the two cylinders. T/d=1.7,Re=5900. Two hot-wires were placed at x/d=0 and 0.2d away from the surface of each cylinder.
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Variation of the cross-flow fy(1) with T/d and Ur: ○, Cylinder 1; ▴, Cylinder 2. (a) T/d=3.00, (b) 1.70, (c) 1.13.
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Variation of the inline fx(1) with T/d and Ur: ○, Cylinder 1; ▴, Cylinder 2. (a) T/d=3.00, (b) 1.70, (c) 1.13.
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Relation between Yrms and εy,rms of the same cylinder for different T/d ratios: ○, present data; •, single cylinder, 11
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Relation between εx,rms and Xrms: ○, two cylinders at T/d=3.00; •, single cylinder. Solid line indicates a best fit to the experimental data.

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