The effect of shroud on vortex shedding mechanism of cylinder

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dc.authoridOzkan, Gokturk Memduh/0000-0002-3698-2486
dc.authoridSahin, Besir/0000-0003-0671-0890
dc.authoridDurhasan, Tahir/0000-0001-5212-9170
dc.contributor.authorDurhasan, T.
dc.contributor.authorPinar, E.
dc.contributor.authorOzkan, G. M.
dc.contributor.authorAkilli, H.
dc.contributor.authorSahin, B.
dc.date.accessioned2025-01-06T17:37:20Z
dc.date.available2025-01-06T17:37:20Z
dc.date.issued2019
dc.description.abstractIn the present study, flow characteristics were investigated experimentally using particle image velocimetry technique (PIV) in a gap between a solid cylinder and a shroud to reveal the effect of shroud diameter (D-s) and porosity (beta) on the vortex shedding mechanism of the cylinder. Porosity (varied from beta = 0.3 to 0.7) and diameter ratio (D/D-s = 0.4, 0.5 and 0.6) were main parameters examined at a Reynolds number of Re = 5000. For the porosity values of beta <= 0.5, it is observed that vortex formation of the cylinder occurs only in the gap and shroud produces its own wake flow patterns. Penetrating flow through the shroud extends the shear layers on the both sides of the shroud through the downstream direction and prevents the interaction of shear layers in the near wake region. The diameter ratio and the porosity are impactful on the wake flow patterns in outer region of the shroud since they are determinant of the penetrating flow rate. Force measurements were also performed in the air tunnel in order to reveal the effect of shroud on the drag coefficient of cylinder. It is found that the drag coefficient of the cylinders are reduced significantly by shrouds when compared with that obtained from the bare cylinder case. However, the drag coefficient of the cylinder together with the shroud is higher than the bare cylinder for all cases since the shrouds enlarge the area exposed to the flow.
dc.description.sponsorshipScientific and Technological Research Council of Turkey [114R087]
dc.description.sponsorshipThe authors greatly acknowledge the contribution of the Scientific and Technological Research Council of Turkey to the funding of this research under contract no. 114R087. They wishes also to thank Prof. Dr. Yahya Erkan Akansu for providing the force measurement system.
dc.identifier.doi10.1016/j.apor.2019.01.007
dc.identifier.endpage61
dc.identifier.issn0141-1187
dc.identifier.issn1879-1549
dc.identifier.scopus2-s2.0-85059675927
dc.identifier.scopusqualityQ1
dc.identifier.startpage51
dc.identifier.urihttps://doi.org/10.1016/j.apor.2019.01.007
dc.identifier.urihttps://hdl.handle.net/20.500.14669/2199
dc.identifier.volume84
dc.identifier.wosWOS:000459363300005
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Sci Ltd
dc.relation.ispartofApplied Ocean Research
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectCylinder
dc.subjectDrag coefficient
dc.subjectPIV
dc.subjectShroud
dc.subjectVortex shedding mechanism
dc.titleThe effect of shroud on vortex shedding mechanism of cylinder
dc.typeArticle

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