This paper presents measurements of the wake field behind three riser models obtained by using a Digital Particle Image Velocimetry (DPIV). The three riser models were a circular rigid cylinder, a cylinder fitted with fairings and a cylinder fitted with strakes. The models were free to vibrate in the cross-flow direction when towed in a uniform flow. The range of tested Reynolds number based on the diameter of the cylinder was from 3×104 to 2.5×105. The measurement results showed that the transverse vibration amplitudes for both the faired and straked cylinder were far less than those of the bare cylinder. Based on the wake flow field comparison between the models tested it was found that the modes of vortex shedding observed behind the bare cylinder did not occur behind either the faired or straked cylinder. This reveals that the vibrations responses of the cylinders are directly related to their wake modes. Strong, regularly shed vortices induce large amplitude vibration and weak, scattered vortices lead small amplitude or no vibration. The different wake patterns are presented for the three cylinders.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4822-7
PROCEEDINGS PAPER
Wake Fields Behind Risers Undergoing Vortex-Induced Vibration
Jie Xu,
Jie Xu
Memorial University of Newfoundland, St. John’s, NL, Canada
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Don Spencer,
Don Spencer
Oceanic Consulting Corporation, St. John’s, NL, Canada
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Alex Gardner,
Alex Gardner
Oceanic Consulting Corporation, St. John’s, NL, Canada
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David Molynuex,
David Molynuex
Institute for Ocean Technology, St. John’s, NL, Canada
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Wei Qiu,
Wei Qiu
Memorial University of Newfoundland, St. John’s, NL, Canada
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Neil Bose,
Neil Bose
University of Tasmania, Tasmania, Australia
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Rodney H. Masters,
Rodney H. Masters
AIMS International, Inc., Houston, TX
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John Shanks
John Shanks
RiserTec Limited, UK
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Jie Xu
Memorial University of Newfoundland, St. John’s, NL, Canada
Don Spencer
Oceanic Consulting Corporation, St. John’s, NL, Canada
Alex Gardner
Oceanic Consulting Corporation, St. John’s, NL, Canada
David Molynuex
Institute for Ocean Technology, St. John’s, NL, Canada
Wei Qiu
Memorial University of Newfoundland, St. John’s, NL, Canada
Neil Bose
University of Tasmania, Tasmania, Australia
Rodney H. Masters
AIMS International, Inc., Houston, TX
John Shanks
RiserTec Limited, UK
Paper No:
OMAE2008-57068, pp. 539-546; 8 pages
Published Online:
July 27, 2009
Citation
Xu, J, Spencer, D, Gardner, A, Molynuex, D, Qiu, W, Bose, N, Masters, RH, & Shanks, J. "Wake Fields Behind Risers Undergoing Vortex-Induced Vibration." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 5: Materials Technology; CFD and VIV. Estoril, Portugal. June 15–20, 2008. pp. 539-546. ASME. https://doi.org/10.1115/OMAE2008-57068
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