Slender offshore structures in deep water subjected to currents may experience vortex-induced vibrations (VIV), which can cause significant fatigue damage. Extensive experimental researches have been conducted to study the VIV in the past several decades. However, most of the experimental works have small-scale models and relatively low Reynolds number (Re)—“subcritical” or even lower Reynolds number regime. There is a lack of full understanding of the VIV in prototype Re flow regime. Applying the results with low Re to a full-scale riser with prototype Re might have uncertainties due to the scaling effects. In addition, the surface roughness of the riser is also an important parameter, especially in critical Re regime, which is the case for prototype risers. In the present study, two full-scale rigid riser models with different surface roughness ratios were tested in the towing tank of MARINTEK in 2014. Stationary tests, pure crossflow (CF) free oscillation tests, and forced/controlled motion tests were carried out. Several conclusions could be made: The drag coefficient is dependent on the Re number and surface roughness ratio. At critical and supercritical flow regimes, the displacement amplitude ratio is less sensitive to Re than that at lower Re. The displacement amplitude ratio in subcritical flow regime is significantly larger than that in critical and supercritical flow regimes. Two excitation regions for the ‘smooth riser’ and one excitation region for the “rough riser” are identified.
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February 2018
Research-Article
Prototype Reynolds Number Vortex-Induced Vibration Tests on a Full-Scale Rigid Riser
Halvor Lie,
Halvor Lie
SINTEF Ocean,
Trondheim NO-7052, Norway
Trondheim NO-7052, Norway
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Rolf J. Baarholm
Rolf J. Baarholm
STATOIL,
Stjørdal NO-7500, Norway
Stjørdal NO-7500, Norway
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Decao Yin
Halvor Lie
SINTEF Ocean,
Trondheim NO-7052, Norway
Trondheim NO-7052, Norway
Rolf J. Baarholm
STATOIL,
Stjørdal NO-7500, Norway
Stjørdal NO-7500, Norway
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 27, 2017; final manuscript received July 26, 2017; published online September 14, 2017. Assoc. Editor: Luis V. S. Sagrilo.
J. Offshore Mech. Arct. Eng. Feb 2018, 140(1): 011702 (11 pages)
Published Online: September 14, 2017
Article history
Received:
April 27, 2017
Revised:
July 26, 2017
Citation
Yin, D., Lie, H., and Baarholm, R. J. (September 14, 2017). "Prototype Reynolds Number Vortex-Induced Vibration Tests on a Full-Scale Rigid Riser." ASME. J. Offshore Mech. Arct. Eng. February 2018; 140(1): 011702. https://doi.org/10.1115/1.4037538
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