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dc.contributor.authorKazeminezhad, M.en_US
dc.contributor.authorYeganeh-Bakhtiary, A.en_US
dc.contributor.authorEternad Shahidi, A.en_US
dc.date.accessioned2017-04-24T10:19:02Z
dc.date.available2017-04-24T10:19:02Z
dc.date.issued2010en_US
dc.date.modified2012-05-28T22:33:04Z
dc.identifier.issn01411187en_US
dc.identifier.doi10.1016/j.apor.2010.10.002en_US
dc.identifier.urihttp://hdl.handle.net/10072/44213
dc.description.abstractIn this study the force components and vortex shedding frequency of a pipe exposed to a steady current were numerically investigated in terms of the drag coefficient, lift coefficient and Strouhal number. The effects of the bed proximity and boundary layer thickness on these parameters were studied extensively. The Reynolds-averaged-Navier-Stokes equations with a k-e turbulence closure model were numerically solved to approximate both the flow pattern and pressure distribution around the pipe. The instantaneous drag and lift coefficients were calculated based on the pressure distribution around the pipe, while the Strouhal number was estimated by the spectral analysis of the predicted instantaneous lift force. Evaluation of the numerical model revealed that the model well predicted the velocity profile around the pipe, force coefficients and Strouhal number. The results showed that the model slightly over-predicts the mean force coefficients and Strouhal number. It is concluded that the mean force coefficients and the root-mean-square (RMS) lift coefficient are strongly affected by the gap to diameter ratio while the Strouhal number is slightly affected by the gap ratio. The results also indicated that the mean lift force acting on the pipe is upward in all boundary layers and is rapidly decreased by increasing the gap ratio, whereas the mean drag force is slightly increased as the gap ratio is increased up to a certain value. The RMS lift force also increased as the gap ratio increased up to a certain value and remained approximately constant for further increase of the gap ratio. The mean force coefficients and Strouhal number calculated in terms of the flow velocity at the pipe axis are marginally influenced by the boundary layer thickness, while the parameters calculated in terms of the free-stream velocity are strongly affected by the boundary layer thickness.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_US
dc.format.extent465553 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_US
dc.publisherElsevieren_US
dc.publisher.placeUnited Kingdomen_US
dc.relation.ispartofstudentpublicationNen_US
dc.relation.ispartofpagefrom460en_US
dc.relation.ispartofpageto470en_US
dc.relation.ispartofissue4en_US
dc.relation.ispartofjournalApplied Ocean Researchen_US
dc.relation.ispartofvolume32en_US
dc.rights.retentionYen_US
dc.subject.fieldofresearchOceanography not elsewhere classifieden_US
dc.subject.fieldofresearchcode040599en_US
dc.titleNumerical investigation of boundary layer effects on vortex shedding frequency and forces acting upon marine pipelineen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightCopyright 2010 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.en_US
gro.date.issued2010
gro.hasfulltextFull Text


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