Please use this identifier to cite or link to this item: http://hdl.handle.net/11422/8822
Type: Artigo
Title: The numerical computation of near-wall turbulent flow over a steep hill
Author(s)/Inventor(s): Loureiro, Juliana Braga Rodrigues
Alho, Alexandre Teixeira de Pinho
Freire, Atila Pantaleão Silva
Abstract: Indisponível.
Abstract: The present work performs a detailed comparison between numerical computations for the flow over a two dimensional steep hill and some newly obtained laboratory data. Six turbulence models were tested: four eddy viscosity models (k– , RNG- , k–o, SST) and two second-moment models (SSG–RSM- , BSL–RSM-o). The experiments were conducted in a water channel and were specially planned such that the large separated flow region that is formed on the lee side of the hill could be well scrutinized. The experimental results include complete profiles of the mean velocity components and of the twodimensional Reynolds stress tensor and were obtained through the laser Doppler anemometry. A particular concern of this work has been to achieve a detailed experimental and numerical characterization of the near-wall flow region. As such, for most of the measuring stations, at least eight points were located in the viscous sublayer. The work also shows the distribution of wall-shear stress in detail. The o-equation-based models were observed to perform much better than the -equationbased models. The length of separated flow region, mean velocity profiles and wall-shear stress were all reasonably well predicted. The flow properties on the hill top were particularly difficult to describe. The turbulence properties in the reversed flow region were best simulated by the BSL–RSM model. r 2008 Elsevier Ltd. All rights reserved.
Keywords: Numerical computations
Flow over hills
Experiments
Skin friction
Subject CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
Production unit: Núcleo Interdisciplinar de Dinâmica dos Fluidos
Publisher: Elsevier
In: Journal of Wind Engineering and Industrial Aerodynamics
Volume: 96
Issue: 5
Issue Date: 18-Apr-2009
DOI: 10.1016/j.jweia.2008.01.011
Publisher country: Brasil
Language: eng
Right access: Acesso Aberto
ISSN: 0167-6105
Appears in Collections:Engenharias

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