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dc.contributor.authorRodríguez Pérez, Ivette María
dc.contributor.authorLehmkuhl Barba, Oriol
dc.contributor.authorPiomelli, Ugo
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.identifier.citationRodriguez, I., Lehmkuhl, O., Piomelli, U., Chiva, J., Borrell, R., Oliva, A. LES-based study of the roughness effects on the wake of a circular cylinder from subcritical to transcritical Reynolds numbers. "Flow turbulence and combustion", 27 Octubre 2017, vol. 99, núm. 3-4, p. 729-763.
dc.descriptionThis is a copy of the author 's final draft version of an article published in the journal Flow turbulence and combustion.
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.format.extent35 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
dc.subject.lcshComputational fluid dynamics
dc.subject.otherVortex shedding
dc.titleLES-based study of the roughness effects on the wake of a circular cylinder from subcritical to transcritical Reynolds numbers
dc.subject.lemacDinàmica de fluids -- Simulació per ordinador
dc.contributor.groupUniversitat Politècnica de Catalunya. TUAREG - Turbulence and Aerodynamics in Mechanical and Aerospace Engineering Research Group
dc.contributor.groupUniversitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
local.citation.authorRodriguez, I.; Lehmkuhl, O.; Piomelli, U.; Chiva, J.; Borrell, R.; Oliva, A.
local.citation.publicationNameFlow turbulence and combustion

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