On the significance of the higher-order stress in riser vortex-induced vibrations responses
Vortex-induced vibrations (VIV) can lead to fast accumulation of fatigue damage and increased drag loads for slender marine structures. VIV responses mainly occur at the vortex shedding frequency, while higher harmonics can also be excited. Recent VIV model tests with flexible pipes have shown that...
Published in: | Journal of Offshore Mechanics and Arctic Engineering |
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Online Access: | http://hdl.handle.net/11250/2646511 https://doi.org/10.1115/1.4040798 |
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ftsintef:oai:sintef.brage.unit.no:11250/2646511 2023-05-15T14:21:40+02:00 On the significance of the higher-order stress in riser vortex-induced vibrations responses Wu, Jie Yin, Decao Lie, Halvor Larsen, Carl Martin Baarholm, Rolf Jarle Liapis, Stergios 2019-02 application/pdf http://hdl.handle.net/11250/2646511 https://doi.org/10.1115/1.4040798 eng eng Journal of Offshore Mechanics and Arctic Engineering. 2019, 141:011705 (1), 1-11. urn:issn:0892-7219 http://hdl.handle.net/11250/2646511 https://doi.org/10.1115/1.4040798 cristin:1695632 Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no CC-BY-NC-ND 1-11 141:011705 Journal of Offshore Mechanics and Arctic Engineering 1 Fluid-structure interaction Hydrodynamics Ship motions Risers Cable dynamics Moorings Journal article Peer reviewed 2019 ftsintef https://doi.org/10.1115/1.4040798 2021-08-04T12:00:17Z Vortex-induced vibrations (VIV) can lead to fast accumulation of fatigue damage and increased drag loads for slender marine structures. VIV responses mainly occur at the vortex shedding frequency, while higher harmonics can also be excited. Recent VIV model tests with flexible pipes have shown that higher harmonics in the crossflow (CF) direction can contribute to the fatigue damage significantly due to its higher frequency. Rigid cylinder experiments show that the CF third-order harmonics are more pronounced when the motion orbit is close to a “figure 8” shape and the cylinder is moving against the flow at its largest CF motion. However, there is still lack of understanding of when and where higher harmonics occur for a flexible pipe. Therefore, significant uncertainty remains on how to account for fatigue damage due to higher harmonics in VIV prediction. In the present paper, representative VIV data from various riser model test campaigns are carefully studied and analyzed. The key parameters that influence the magnitude of the third-order harmonic stress are found to be the bending stiffness, the reduced velocity, and the orbit stability. The experimental data are analyzed in order to assess the impact of each parameter on the third-order harmonic stress. A preliminary empirical response model to estimate the maximum CF third-order harmonic stress based on these identified structural and hydrodynamic parameters has been proposed. The results of this study will contribute to reduce the uncertainty and unnecessary conservatism in VIV prediction. acceptedVersion Article in Journal/Newspaper Arctic SINTEF Open (Brage) Journal of Offshore Mechanics and Arctic Engineering 141 1 |
institution |
Open Polar |
collection |
SINTEF Open (Brage) |
op_collection_id |
ftsintef |
language |
English |
topic |
Fluid-structure interaction Hydrodynamics Ship motions Risers Cable dynamics Moorings |
spellingShingle |
Fluid-structure interaction Hydrodynamics Ship motions Risers Cable dynamics Moorings Wu, Jie Yin, Decao Lie, Halvor Larsen, Carl Martin Baarholm, Rolf Jarle Liapis, Stergios On the significance of the higher-order stress in riser vortex-induced vibrations responses |
topic_facet |
Fluid-structure interaction Hydrodynamics Ship motions Risers Cable dynamics Moorings |
description |
Vortex-induced vibrations (VIV) can lead to fast accumulation of fatigue damage and increased drag loads for slender marine structures. VIV responses mainly occur at the vortex shedding frequency, while higher harmonics can also be excited. Recent VIV model tests with flexible pipes have shown that higher harmonics in the crossflow (CF) direction can contribute to the fatigue damage significantly due to its higher frequency. Rigid cylinder experiments show that the CF third-order harmonics are more pronounced when the motion orbit is close to a “figure 8” shape and the cylinder is moving against the flow at its largest CF motion. However, there is still lack of understanding of when and where higher harmonics occur for a flexible pipe. Therefore, significant uncertainty remains on how to account for fatigue damage due to higher harmonics in VIV prediction. In the present paper, representative VIV data from various riser model test campaigns are carefully studied and analyzed. The key parameters that influence the magnitude of the third-order harmonic stress are found to be the bending stiffness, the reduced velocity, and the orbit stability. The experimental data are analyzed in order to assess the impact of each parameter on the third-order harmonic stress. A preliminary empirical response model to estimate the maximum CF third-order harmonic stress based on these identified structural and hydrodynamic parameters has been proposed. The results of this study will contribute to reduce the uncertainty and unnecessary conservatism in VIV prediction. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Wu, Jie Yin, Decao Lie, Halvor Larsen, Carl Martin Baarholm, Rolf Jarle Liapis, Stergios |
author_facet |
Wu, Jie Yin, Decao Lie, Halvor Larsen, Carl Martin Baarholm, Rolf Jarle Liapis, Stergios |
author_sort |
Wu, Jie |
title |
On the significance of the higher-order stress in riser vortex-induced vibrations responses |
title_short |
On the significance of the higher-order stress in riser vortex-induced vibrations responses |
title_full |
On the significance of the higher-order stress in riser vortex-induced vibrations responses |
title_fullStr |
On the significance of the higher-order stress in riser vortex-induced vibrations responses |
title_full_unstemmed |
On the significance of the higher-order stress in riser vortex-induced vibrations responses |
title_sort |
on the significance of the higher-order stress in riser vortex-induced vibrations responses |
publishDate |
2019 |
url |
http://hdl.handle.net/11250/2646511 https://doi.org/10.1115/1.4040798 |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
1-11 141:011705 Journal of Offshore Mechanics and Arctic Engineering 1 |
op_relation |
Journal of Offshore Mechanics and Arctic Engineering. 2019, 141:011705 (1), 1-11. urn:issn:0892-7219 http://hdl.handle.net/11250/2646511 https://doi.org/10.1115/1.4040798 cristin:1695632 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1115/1.4040798 |
container_title |
Journal of Offshore Mechanics and Arctic Engineering |
container_volume |
141 |
container_issue |
1 |
_version_ |
1766294391839784960 |