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dc.contributor.authorUlveseter, Jan Vidar
dc.contributor.authorThorsen, Mats Jørgen
dc.contributor.authorSævik, Svein
dc.contributor.authorLarsen, Carl Martin
dc.date.accessioned2019-11-29T12:30:12Z
dc.date.available2019-11-29T12:30:12Z
dc.date.created2019-10-09T13:34:02Z
dc.date.issued2019
dc.identifier.issn0141-1187
dc.identifier.urihttp://hdl.handle.net/11250/2631091
dc.description.abstractVortex-induced vibrations (VIV) of slender marine structures are complicated response processes, where a number of distinct frequency components might be simultaneously active. These are categorized as fundamental and higher harmonics respectively, where the latter can have a tremendous impact on the fatigue life. The present work proposes a method for time domain simulation of such multi-frequency response, by introducing a higher harmonic load term to a pre-existing semi-empirical hydrodynamic force model. Forced motion tests of a circular cylinder were simulated to experimentally and qualitatively validate the fluid-structure energy transfer. Next, the model was used to predict the response of a tension dominated riser in uniform current, for 22 velocities in the range 0.3 m/s to 2.4 m/s. The empirical input was chosen to give an average best fit with respect to the cross-flow strain measurements, which allowed dominating frequencies, fatigue damage, higher harmonics and response variability to be predicted with a high level of realism. Same set of empirical coefficients was subsequently used to predict VIV of three additional flexible pipe experiments in uniform flow, with significant differences in structural properties. The results were satisfactory for all cases, but could be improved by moderate changes to the empirical input.nb_NO
dc.language.isoengnb_NO
dc.publisherElseviernb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleSimulating fundamental and higher harmonic VIV of slender structuresnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.volume90nb_NO
dc.source.journalApplied Ocean Researchnb_NO
dc.identifier.doi10.1016/j.apor.2019.101856
dc.identifier.cristin1735498
dc.description.localcode© 2019. This is the authors’ accepted and refereed manuscript to the article. Locked until 1.7.2021 due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/nb_NO
cristin.unitcode194,64,20,0
cristin.unitnameInstitutt for marin teknikk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
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