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Drilling Riser Fairing Tests at Prototype Reynolds Numbers

[+] Author Affiliations
Don W. Allen, Dean L. Henning, Li Lee

Shell Global Solutions (US) Inc., Houston, TX

Paper No. OMAE2007-29219, pp. 793-802; 10 pages
doi:10.1115/OMAE2007-29219
From:
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology; CFD and VIV
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4269-X | eISBN: 0-7918-3799-8
  • Copyright © 2007 by Shell Global Solutions

abstract

Tow tests have been performed on flexible circular cylinders, with and without short weathervaning fairings, towed in a basin at critical and supercritical Reynolds numbers. The tests were conducted in the David Taylor Model Basin and the Rotating Arm Facility, at the Carderock Division, Naval Surface Warfare Center, in West Bethesda, Maryland. Measurements were made of both the drag and acceleration (due to vortex-induced vibration) of the cylinder. A 5-9/16-inch diameter PVC pipe was used to achieve Reynolds numbers ranging from about 7×105 to 1.5×106 , in uniform flow, for straight tow tests with the pipe experiencing first mode bending vortex-induced vibration. Fiberglass pipes with a 2.5 inch diameter were used to achieve high mode number vortex-induced vibration, in sheared flow, at Reynolds numbers as high as about 3.75×105 . The test results illustrate the importance of conducting tests at prototype Reynolds numbers for drilling riser as well as the importance of conducting tests in sheared flows and at higher mode numbers to fully understand the performance of a suppression device.

Copyright © 2007 by Shell Global Solutions

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