Please use this identifier to cite or link to this item: http://hdl.handle.net/11422/8840
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dc.contributor.authorLoureiro, Juliana Braga Rodrigues-
dc.contributor.authorFreire, Atila Pantaleão Silva-
dc.date.accessioned2019-07-17T15:38:51Z-
dc.date.available2006-08-24-
dc.date.available2019-07-17T15:38:51Z-
dc.date.issued2005-08-24-
dc.identifier.issn1678-5878pt_BR
dc.identifier.urihttp://hdl.handle.net/11422/8840-
dc.description.abstractThis work presents a laboratory study on the behavior of turbulent boundary layers over steep topographic elevations. Two main topics of interest are addressed here: (i) to investigate and characterize the separated flow region that is formed on the leeside of a steep elevation, and (ii) to evaluate the effects of flow stability conditions on the properties of boundary layers also subject to surface changes in elevation. To carry out this task, water channel and wind-tunnel investigations were conducted. For the former research topic, a neutrally stratified boundary layer was simulated in the water-channel of the Hydraulics Laboratory of FEUP. Mean and turbulent velocities were measured through laser-Doppler anemometry. Results provided a thorough description of the inner layers along the hill and inside the recirculation region. The refined near-wall data has contributed to the calculation of the friction velocity along the hill through different methods. For the latter topic, neutral, stable and unstable boundary layers were simulated in a wind-tunnel in the Laboratory of Turbulence Mechanics of COPPE/UFRJ. Simultaneous velocity and temperature fields were measured with the aid of thermal anemometry. These results allowed the characterization of the effects of the stratification on the speed-up factor, i.e. the maximum acceleration of the flow on hilltop. The present paper has introduced the concept of the heat up/down factor, in order to study the behaviour of the temperature field on the crest of the elevation.en
dc.languageengpt_BR
dc.publisherSpringer Verlagen
dc.relation.ispartofJournal of the Brazilian Society of Mechanical Sciences and Engineeringen
dc.rightsAcesso Abertopt_BR
dc.subjectFlow over hillsen
dc.subjectTurbulenceen
dc.subjectSeparationen
dc.subjectStratificationen
dc.subjectHot-wire anemometryen
dc.subjectLaser-Doppler anemometryen
dc.titleExperimental Investigation of Turbulent Boundary Layers over Steep Two-dimensional Elevationsen
dc.typeArtigopt_BR
dc.identifier.doi10.1590/S1678-58782005000400001pt_BR
dc.description.resumoIndisponível.pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentNúcleo Interdisciplinar de Dinâmica dos Fluidospt_BR
dc.subject.cnpqCNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOSpt_BR
dc.citation.volume27pt_BR
dc.citation.issue4pt_BR
dc.citation.spage329pt_BR
dc.citation.epage344pt_BR
dc.embargo.terms365 diaspt_BR
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