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Research Papers: Deep-Water Petroleum

Riser Interference Tests on Flexible Tubulars at Prototype Reynolds Numbers

[+] Author and Article Information
Don W. Allen

Department of Pipelines and Offshore Structures, Shell Global Solutions (US) Inc., 3333 Highway 6 South E2460, Houston, TX 77082don.allen@shell.com

Dean L. Henning

Department of Pipelines and Offshore Structures, Shell Global Solutions (US) Inc., 3333 Highway 6 South E2460, Houston, TX 77082don.allen@shell.com

Li Lee

Department of Pipelines and Offshore Structures, Shell Global Solutions (US) Inc., 3333 Highway 6 South E2460, Houston, TX 77082don.allen@shell.com

J. Energy Resour. Technol 130(3), 031501 (Aug 22, 2008) (7 pages) doi:10.1115/1.2955484 History: Received August 28, 2006; Revised March 19, 2008; Published August 22, 2008

Current tank tests have been performed on two equal-diameter, flexible cylinders in tandem with various end spacings or separation distances. While the cylinders experienced transverse vortex-induced vibration in only the first mode, the test Reynolds numbers were well into the transition range, and the drag crisis was clearly observed on the upstream cylinder. Both acceleration and drag were measured to provide some interesting correlations between vibration, drag, and end spacing for each of the two cylinders.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Drawing of test setup

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Figure 2

Transverse rms displacements and drag coefficients for the 5D end spacing

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Figure 3

Transverse rms displacements and drag coefficients for the 4D end spacing

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Figure 4

Transverse rms displacements and drag coefficients for the 3D end spacing

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Figure 5

Transverse rms displacements and drag coefficients for the 2D end spacing

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Figure 6

Effect of end spacing on the upstream cylinder transverse rms displacement

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Figure 7

Effect of end spacing on the downstream cylinder transverse rms displacement

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Figure 8

Effect of end spacing on the upstream cylinder drag coefficient

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Figure 9

Effect of end spacing on the downstream cylinder drag coefficient

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