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On the flow past a circular cylinder from critical to super-critical Reynolds numbers: Wake topology and vortex shedding
dc.contributor.author | Rodríguez Pérez, Ivette María |
dc.contributor.author | Lehmkuhl Barba, Oriol |
dc.contributor.author | Chiva Segura, Jorge |
dc.contributor.author | Borrell Pol, Ricard |
dc.contributor.author | Oliva Llena, Asensio |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics |
dc.date.accessioned | 2016-04-19T14:15:46Z |
dc.date.available | 2017-05-13T00:30:41Z |
dc.date.issued | 2015-05-13 |
dc.identifier.citation | Rodriguez, 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.issn | 0142-727X |
dc.identifier.uri | http://hdl.handle.net/2117/85914 |
dc.description.abstract | Large-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.extent | 13 p. |
dc.language.iso | eng |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
dc.subject.lcsh | Reynolds number |
dc.subject.lcsh | Vortex shedding |
dc.subject.other | LES |
dc.subject.other | Critical and super-critical Reynolds numbers |
dc.subject.other | Vortex shedding |
dc.subject.other | Coherent flow |
dc.subject.other | Wake topology |
dc.title | On the flow past a circular cylinder from critical to super-critical Reynolds numbers: Wake topology and vortex shedding |
dc.type | Article |
dc.subject.lemac | Mecànica de fluids -- Models matemàtics |
dc.subject.lemac | Remolins (Mecànica de fluids) |
dc.contributor.group | Universitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor |
dc.identifier.doi | 10.1016/j.ijheatfluidflow.2015.05.009 |
dc.description.peerreviewed | Peer Reviewed |
dc.relation.publisherversion | http://www.sciencedirect.com/science/article/pii/S0142727X15000557 |
dc.rights.access | Open Access |
local.identifier.drac | 15731496 |
dc.description.version | Postprint (author's final draft) |
local.citation.author | Rodriguez, I.; Lehmkuhl, O.; Chiva, J.; Borrell, R.; Oliva, A. |
local.citation.publicationName | International journal of heat and fluid flow |
local.citation.volume | 55 |
local.citation.startingPage | 91 |
local.citation.endingPage | 103 |
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