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dc.contributor.authorRodriguez, Ivette
dc.contributor.authorLehmkuhl Barba, Oriol
dc.contributor.authorPiomelli, Ugo
dc.contributor.authorChiva, Jorge
dc.contributor.authorBorrell, Ricard
dc.contributor.authorOliva, Assensi
dc.contributor.otherBarcelona Supercomputing Center
dc.date.accessioned2018-03-07T15:22:13Z
dc.date.available2018-12-01T01:31:03Z
dc.date.issued2017-12
dc.identifier.citationRodriguez, I. [et al.]. LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers. "Flow, Turbulence and Combustion", Desembre 2017, vol. 99, núm. 3-4, p. 729-763.
dc.identifier.issn1386-6184
dc.identifier.urihttp://hdl.handle.net/2117/114903
dc.description.abstractThis paper investigates the effects of surface roughness on the flow past a circular cylinder at subcritical to transcritical Reynolds numbers. Large eddy simulations of the flow for sand grain roughness of size k/D = 0.02 are performed (D is the cylinder diameter). Results show that surface roughness triggers the transition to turbulence in the boundary layer at all Reynolds numbers, thus leading to an early separation caused by the increased momentum deficit, especially at transcritical Reynolds numbers. Even at subcritical Reynolds numbers, boundary layer instabilities are triggered in the roughness sublayer and eventually lead to the transition to turbulence. The early separation at transcritical Reynolds numbers leads to a wake topology similar to that of the subcritical regime, resulting in an increased drag coefficient and lower Strouhal number. Turbulent statistics in the wake are also affected by roughness; the Reynolds stresses are larger due to the increased turbulent kinetic energy production in the boundary layer and separated shear layers close to the cylinder shoulders.
dc.description.sponsorshipWe acknowledge “Red Española de Surpercomputación” (RES) for awarding us access to the MareNostrum III machine based in Barcelona, Spain (Ref. FI-2015-2-0026 and FI-2015-3-0011). We also acknowledge PRACE for awarding us access to Fermi and Marconi Supercomputers at Cineca, Italy (Ref. 2015133120). Oriol Lehmkuhl acknowledges a PDJ 2014 Grant by AGAUR (Generalitat de Catalunya). Ugo Piomelli acknowledges the support of the Natural Sciences and Engineering Research Council (NSERC) of Canada under the Discovery Grant Programme (Grant No. RGPIN-2016-04391). Ricard Borrell acknowledges a Juan de la Cierva postdoctoral grant (IJCI-2014-21034). Ivette Rodriguez, Oriol Lehmkuhl, Ricard Borrell and Assensi Oliva acknowledge Ministerio de Economía y Competitividad, Secretaría de Estado de Investigación, Desarrollo e Innovación, Spain (ref. ENE2014-60577-R).
dc.format.extent35 p.
dc.language.isoeng
dc.publisherSpringer Verlag
dc.subjectÀrees temàtiques de la UPC::Enginyeria elèctrica
dc.subject.lcshWakes (Fluid dynamics)
dc.subject.otherLES
dc.subject.otherVortex shedding
dc.subject.otherWakes
dc.subject.otherRoughness
dc.titleLES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
dc.typeArticle
dc.subject.lemacDinàmica de fluids
dc.identifier.doi10.1007/s10494-017-9866-2
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://link.springer.com/article/10.1007/s10494-017-9866-2
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
dc.relation.projectidinfo:eu-repo/grantAgreement/MINECO//IJCI-2014-21034/ES/IJCI-2014-21034/
local.citation.publicationNameFlow, Turbulence and Combustion
local.citation.volume99
local.citation.number3-4
local.citation.startingPage729
local.citation.endingPage763


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