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dc.contributor.authorKazeminezhad, MH
dc.contributor.authorYeganeh-Bakhtiary, A
dc.contributor.authorEtemad-Shahidi, A
dc.date.accessioned2017-05-03T13:12:33Z
dc.date.available2017-05-03T13:12:33Z
dc.date.issued2010
dc.date.modified2012-05-28T22:33:04Z
dc.identifier.issn0141-1187
dc.identifier.doi10.1016/j.apor.2010.10.002
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.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent465553 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeUnited Kingdom
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom460
dc.relation.ispartofpageto470
dc.relation.ispartofissue4
dc.relation.ispartofjournalApplied Ocean Research
dc.relation.ispartofvolume32
dc.rights.retentionY
dc.subject.fieldofresearchOceanography
dc.subject.fieldofresearchOceanography not elsewhere classified
dc.subject.fieldofresearchCivil engineering
dc.subject.fieldofresearchResources engineering and extractive metallurgy
dc.subject.fieldofresearchcode3708
dc.subject.fieldofresearchcode370899
dc.subject.fieldofresearchcode4005
dc.subject.fieldofresearchcode4019
dc.titleNumerical investigation of boundary layer effects on vortex shedding frequency and forces acting upon marine pipeline
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 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.
gro.date.issued2010
gro.hasfulltextFull Text
gro.griffith.authorEtemad Shahidi, Amir F.


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