Please use this identifier to cite or link to this item: http://hdl.handle.net/11422/8783
Type: Artigo
Title: Note on a Parametric Relation for Separating Flow over a Rough Hill
Author(s)/Inventor(s): Loureiro, Juliana Braga Rodrigues
Freire, Atila Pantaleão Silva
Abstract: Indisponível.
Abstract: A parametrization method used to account for the effects of flow separation and wall roughness on the lower boundary condition for turbulent boundary layers is investigated against direct numerical simulation and laser Doppler anemometry data. The numerical simulation represents flow over a smooth, flat surface with a prescribed external adverse pressure gradient. The water-channel experiments cover flow over smooth and rough hills for two specified Reynolds numbers. Global optimization algorithms based on four different direct search methods are used to assess the parametrization function, C, in terms of local mean velocity profiles and the parametrization parameters u * (friction velocity), ∂ x p (local pressure gradient), z 0 (effective roughness) and d (zero-plane displacement). The study investigates regions of attached and reversed flows, and forty-two velocity profiles are compared with the proposed expression for the function C, including two profiles that satisfy the solution of Stratford.
Keywords: Hill flow
Lower boundary condition
Roughness
Separation
Subject CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
Department : Núcleo Interdisciplinar de Dinâmica dos Fluidos
Publisher: Springer
In: Boundary-Layer Meteorology
Volume: 131
Issue: 2
Issue Date: 9-Feb-2009
DOI: 10.1007/s10546-009-9362-x
Publisher country: Brasil
Language: eng
Right access: Acesso Aberto
ISSN: 1573-1472
Appears in Collections:Engenharias

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