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Technical Briefs

Experimental Investigation of Two Dimensional Motion of an Elastically Supported Cylinder in a Wake

[+] Author and Article Information
Robert D. Blevins

3818 Pringle Street, San Diego, CA 92103rdblevins@aol.com

Jean-Francois Saint-Marcoux, Mason Wu

 Acergy US, Inc., 10787 Clay Road, Houston, TX 77041-5597

J. Offshore Mech. Arct. Eng 130(4), 044502 (Oct 01, 2008) (4 pages) doi:10.1115/1.2948958 History: Received September 14, 2007; Revised May 13, 2008; Published October 01, 2008

Measurements have been made of two dimensional motion of an elastically supported circular cylinder in the wake of a fixed upstream cylinder. The experiments were made in a water flow channel with 6.35cm(2.5in.) diameter cylinders with a maximum Reynolds number of 77,000. The elastically supported downstream cylinder moves downward and inward toward the centerline of the upstream cylinder’s wake with increasing flow velocity, indicating the presence of a transverse lift force and reduced drag in the wake. These forces can cause the cylinders to clash. The measured motions correlate with the theory.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 2

Side view of four bar linkage supporting downstream cylinder; transverse (y) motion of the suspension is out of plane

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Figure 3

Measurement of the downstream cylinder position relative to upstream cylinder with increasing flow velocity

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Figure 4

Comparison of predicted (solid line) and measured (data points) steady positions of the downstream, elastically supported cylinder from various starting points with velocity increasing from zero. Upstream cylinder fixed.

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Figure 1

Fixed upstream cylinder and spring-supported downstream cylinder that can move both in-line (x) and transverse (y) to the mean flow U

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