The Effect of Exposure Length on Vortex Induced Vibration of Flexible Cylinders
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The effect of exposure.pdf
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Author(s)
Sequeiros, Octavio
Rao, Zhibiao
Vandiver, John Kim
Jhingran, Vikas Gopal
Date Issued
July 2012
Journal
Volume 5: Ocean Engineering; CFD and VIV
Publisher
ASME International
Citation
Rao, Zhibiao, J. Kim Vandiver, Vikas Jhingran, and Octavio Sequeiros. “The Effect of Exposure Length on Vortex Induced Vibration of Flexible Cylinders.” Volume 5: Ocean Engineering; CFD and VIV (July 1, 2012).
Version
Final published version
Abstract
This paper addresses a practical problem: “What portion of fairing or strake coverage may be lost or damaged, before the operator must take corrective measures?” This paper explores the effect of lost fairings (the exposure length) on Vortex-Induced Vibration (VIV) of flexible cylinders. The source of data is a recent model test, conducted by SHELL Exploration and Production. A 38m long pipe model with varying amounts of fairings was tested. Response as a function of percent exposure length is reported. Unexpected results are also reported: (i) the flexible ribbon fairings used in the experiment did not suppress VIV at speeds above 1 m/s; (ii) Above 1 m/s, a competition was observed between VIV excited in the faired and bare regions of the cylinder, (iii) Unusual traveling wave behavior was documented—waves generated in the bare region periodically changed direction, and exhibited variation in VIV response frequency.
The results of these tests showed that (1) the excitation on the bare and faired regions could be identified by frequency, because the faired region exhibited a much lower Strouhal number; (2) as expected, the response to VIV on the bare region increased with exposure length; (3) the response to VIV on the faired region decreased with exposure length.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Ocean Engineering
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DOI of Published Version
https://doi.org/10.1115/OMAE2012-83273
