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Drag Reduction of Deepwater Risers by the Use of Helical Grooves

[+] Author Affiliations
Shan Huang, David Clelland, Sandy Day

Universities of Glasgow and Strathclyde, Glasgow, Scotland, UK

Richard James

BP Exploration, Sunbury, UK

Paper No. OMAE2007-29454, pp. 561-565; 5 pages
doi:10.1115/OMAE2007-29454
From:
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4267-3 | eISBN: 0-7918-3799-8
  • Copyright © 2007 by ASME

abstract

Model tests were carried out in a towing tank to investigate the effects of helical grooves on the drag loading of stationary circular cylinders in uniform and steady currents. A series of models were made and tested, including smooth and rough cylinders with and without grooves. The maximum Reynolds number achieved in the tests was about 4×105 . The comparative results between the smooth and grooved cylinders show that the helical grooves reduce the drag loading by between 18 and 25% depending upon the cylinder surface roughness and the Reynolds number. This is a continuation of our work published in OMAE06 in Hamburg on VIV suppression by the use of helical grooves.

Copyright © 2007 by ASME

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