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Suppression of Vortex Induced Vibrations of Circular Cylinders Using Radial Water Jets

[+] Author Affiliations
Kjetil B. Skaugset, Carl M. Larsen

Norwegian University of Science and Technology, Trondheim, Norway

Paper No. OMAE2002-28095, pp. 155-162; 8 pages
doi:10.1115/OMAE2002-28095
From:
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 1
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3611-8 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME

abstract

For oilfield developments in deep water, it is of utmost importance to accurately predict vortex induced vibrations (VIV) of risers and free span pipelines subjected to ocean current. In order to prolong operational life of such structures, VIV suppression devices such as helical strakes or shrouds are often employed. Such devices will, however, imply certain disadvantages such as drag amplification and increased operational costs. Therefore the quest for effective suppression devices with a minimum of such drawbacks is still ongoing. The present paper presents a novel approach for VIV suppression based on radial water jets from a prescribed pattern of circular openings in the cylinder wall. Jet flow will introduce a disturbance that will change VIV amplitudes. The alternation of the flow pattern must be understood to have both 2-dimensional (2-D) and 3-D effects. 2-D effects will influence the local pressure on the cylinder surface by altering the separation point as well as creating a general disturbance to the flow, while the 3-D effects involve changes in correlation of the vortex shedding process along the span of the cylinder. The disturbance to the flow pattern is expected to yield reduced VIV amplitudes. Results will be presented from experiments in a towing tank testing three 2m long spring supported cylinders with diameter 0.1m and two different patterns of radial water jets. The volume flow rate and reduced velocity have been varied in the tests. Oscillation amplitudes, frequencies, added mass and lift and drag force coefficients are presented and compared to a smooth cylinder.

Copyright © 2002 by ASME

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