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dc.contributor.authorRodríguez Pérez, Ivette María
dc.contributor.authorLehmkuhl, Oriol
dc.contributor.authorPiomelli, Ugo
dc.contributor.authorChiva Segura, Jorge
dc.contributor.authorBorrell, Ricard
dc.contributor.authorOliva Llena, Asensio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics
dc.identifier.citationRodriguez, I., Lehmkuhl, O., Piomelli, U., Chiva, J., Borrell, R., Oliva, A. Numerical simulation of roughness effects on the flow past a circular cylinder. A: European Thermal-Sciences Conference. "Journal of Physics: conference series, vol. 745, 2016". Krakow: Institute of Physics (IOP), 2016, p. 1-8.
dc.description.abstractIn the present work large eddy simulations of the flow past a rough cylinder are performed at a Reynolds number of Re = 4.2 × 105 and an equivalent sand-grain surface roughness height ks = 0.02D. In order to determine the effects of the surface roughness on the boundary layer transition and as a consequence on the wake topology, results are compared to those of the smooth cylinder. It is shown that surface roughness triggers the transition to turbulence in the boundary layer, thus leading to an early separation caused by the increased drag and momentum deficit. Thus, the drag coefficient increases up to CD 1.122 (if compared to the smooth cylinder it should be about CD 0.3 - 0.5). The wake topology also changes and resembles more the subcritical wake observed for the smooth cylinder at lower Reynolds numbers than the expected critical wake at this Reynolds number.
dc.format.extent8 p.
dc.publisherInstitute of Physics (IOP)
dc.subjectÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
dc.subject.lcshFluid dynamics
dc.subject.otherBoundary layer turbulence
dc.subject.otherExternal flows
dc.subject.otherFlow simulation
dc.subject.otherLaminar flow
dc.subject.otherLaminar to turbulent transitions
dc.subject.otherNumerical analysis
dc.subject.otherSurface roughness
dc.subject.otherNumerical simulation
dc.subject.otherCircular cylinder
dc.subject.otherLarge Eddy simulations
dc.subject.otherRough cylinder
dc.subject.otherReynolds number
dc.subject.otherEquivalent sand-grain surface roughness effects
dc.subject.otherBoundary layer turbulence transition
dc.subject.otherDrag coefficient
dc.subject.otherSubcritical wake topology
dc.titleNumerical simulation of roughness effects on the flow past a circular cylinder
dc.typeConference report
dc.subject.lemacDinàmica de fluids
dc.contributor.groupUniversitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
upcommons.citation.authorRodriguez, I.; Lehmkuhl, O.; Piomelli, U.; Chiva, J.; Borrell, R.; Oliva, A.
upcommons.citation.contributorEuropean Thermal-Sciences Conference
upcommons.citation.publicationNameJournal of Physics: conference series, vol. 745, 2016

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