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dc.contributor.authorRodríguez Pérez, Ivette María
dc.contributor.authorLehmkuhl Barba, Oriol
dc.contributor.authorChiva Segura, Jorge
dc.contributor.authorBorrell Pol, Ricard
dc.contributor.authorOliva Llena, Asensio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics
dc.date.accessioned2016-04-19T14:15:46Z
dc.date.available2017-05-13T00:30:41Z
dc.date.issued2015-05-13
dc.identifier.citationRodriguez, I., Lehmkuhl, O., Chiva, J., Borrell, R., Oliva, A. On the flow past a circular cylinder from critical to super-critical Reynolds numbers: Wake topology and vortex shedding. "International journal of heat and fluid flow", 13 Maig 2015, vol. 55, p. 91-103.
dc.identifier.issn0142-727X
dc.identifier.urihttp://hdl.handle.net/2117/85914
dc.description.abstractLarge-eddy simulations (LES) of the flow past a circular cylinder are used to investigate the flow topology and the vortex shedding process at Reynolds numbers Re=2.5×105-8.5×105Re=2.5×105-8.5×105. This range encompasses both the critical and super-critical regimes. As the flow enters the critical regime, major changes occur which affect the flow configuration. Asymmetries in the flow are found in the critical regime, whereas the wake recovers its symmetry and stabilizes in the super-critical regime. Wake characteristic lengths are measured and compared between the different Reynolds numbers. It is shown that the super-critical regime is characterised by a plateau in the drag coefficient at about CD˜0.22CD˜0.22, and a quasi-stable wake which has a non-dimensional width of dw/D˜0.4dw/D˜0.4. The periodic nature of the flow is analysed by means of measurements of the unsteady drag and lift coefficients. Power spectra of the lift fluctuations are computed. Wake vortex shedding is found to occur for both regimes investigated, although a jump in frequencies is observed when the flow enters the super-critical regime. In this regime, non-dimensional vortex-shedding frequency is almost constant and equal to St=fvsD/Uref˜0.44St=fvsD/Uref˜0.44. The analysis also shows a steep decrease in the fluctuating lift when entering the super-critical regime. The combined analysis of both wake topology and vortex shedding complements the physical picture of a stable and highly coherent flow in the super-critical regime.
dc.format.extent13 p.
dc.language.isoeng
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
dc.subject.lcshReynolds number
dc.subject.lcshVortex shedding
dc.subject.otherLES
dc.subject.otherCritical and super-critical Reynolds numbers
dc.subject.otherVortex shedding
dc.subject.otherCoherent flow
dc.subject.otherWake topology
dc.titleOn the flow past a circular cylinder from critical to super-critical Reynolds numbers: Wake topology and vortex shedding
dc.typeArticle
dc.subject.lemacMecànica de fluids -- Models matemàtics
dc.subject.lemacRemolins (Mecànica de fluids)
dc.contributor.groupUniversitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor
dc.identifier.doi10.1016/j.ijheatfluidflow.2015.05.009
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0142727X15000557
dc.rights.accessOpen Access
local.identifier.drac15731496
dc.description.versionPostprint (author's final draft)
local.citation.authorRodriguez, I.; Lehmkuhl, O.; Chiva, J.; Borrell, R.; Oliva, A.
local.citation.publicationNameInternational journal of heat and fluid flow
local.citation.volume55
local.citation.startingPage91
local.citation.endingPage103


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