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dc.contributor.authorWu, Jie
dc.contributor.authorYin, Decao
dc.contributor.authorLie, Halvor
dc.contributor.authorLarsen, Carl Martin
dc.contributor.authorBaarholm, Rolf Jarle
dc.contributor.authorLiapis, Stergios
dc.date.accessioned2020-02-07T13:49:35Z
dc.date.available2020-02-07T13:49:35Z
dc.date.created2019-05-05T12:22:23Z
dc.date.issued2019
dc.identifier.citationJournal of Offshore Mechanics and Arctic Engineering. 2019, 141:011705 (1), 1-11.nb_NO
dc.identifier.issn0892-7219
dc.identifier.urihttp://hdl.handle.net/11250/2640486
dc.description.abstractVortex-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.nb_NO
dc.language.isoengnb_NO
dc.publisherASMEnb_NO
dc.titleOn the significance of the higher-order stress in riser vortex-induced vibrations responsesnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber1-11nb_NO
dc.source.volume141:011705nb_NO
dc.source.journalJournal of Offshore Mechanics and Arctic Engineeringnb_NO
dc.source.issue1nb_NO
dc.identifier.doi10.1115/1.4040798
dc.identifier.cristin1695632
dc.description.localcodeThis article will not be available due to copyright restrictions (c) 2019 by ASMEnb_NO
cristin.unitcode194,64,20,0
cristin.unitnameInstitutt for marin teknikk
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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