The Effect of Exposure Length on Vortex Induced Vibration of Flexible Cylinders
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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | en_US |
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ASME International
2017
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| Online Access: | http://hdl.handle.net/1721.1/109417 https://orcid.org/0000-0002-6144-660X |
| _version_ | 1826196825157140480 |
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| author | Sequeiros, Octavio Rao, Zhibiao Vandiver, John Kim Jhingran, Vikas Gopal |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Sequeiros, Octavio Rao, Zhibiao Vandiver, John Kim Jhingran, Vikas Gopal |
| author_sort | Sequeiros, Octavio |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T10:38:13Z |
| format | Article |
| id | mit-1721.1/109417 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:38:13Z |
| publishDate | 2017 |
| publisher | ASME International |
| record_format | dspace |
| spelling | mit-1721.1/1094172022-09-27T13:56:02Z The Effect of Exposure Length on Vortex Induced Vibration of Flexible Cylinders Sequeiros, Octavio Rao, Zhibiao Vandiver, John Kim Jhingran, Vikas Gopal Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Department of Ocean Engineering Rao, Zhibiao Vandiver, John Kim Jhingran, Vikas Gopal 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. DeepStar (Consortium) SHEAR7 JIP 2017-05-30T16:30:16Z 2017-05-30T16:30:16Z 2012-07 Article http://purl.org/eprint/type/ConferencePaper 978-0-7918-4492-2 http://hdl.handle.net/1721.1/109417 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). https://orcid.org/0000-0002-6144-660X en_US http://dx.doi.org/10.1115/OMAE2012-83273 Volume 5: Ocean Engineering; CFD and VIV Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf ASME International American Society of Mechanical Engineers (ASME) |
| spellingShingle | Sequeiros, Octavio Rao, Zhibiao Vandiver, John Kim Jhingran, Vikas Gopal The Effect of Exposure Length on Vortex Induced Vibration of Flexible Cylinders |
| title | The Effect of Exposure Length on Vortex Induced Vibration of Flexible Cylinders |
| title_full | The Effect of Exposure Length on Vortex Induced Vibration of Flexible Cylinders |
| title_fullStr | The Effect of Exposure Length on Vortex Induced Vibration of Flexible Cylinders |
| title_full_unstemmed | The Effect of Exposure Length on Vortex Induced Vibration of Flexible Cylinders |
| title_short | The Effect of Exposure Length on Vortex Induced Vibration of Flexible Cylinders |
| title_sort | effect of exposure length on vortex induced vibration of flexible cylinders |
| url | http://hdl.handle.net/1721.1/109417 https://orcid.org/0000-0002-6144-660X |
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