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Spatial and Temporal Growth of Perturbations in Open-Channel Viscous Transverse Shear Flow

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タイトル: Spatial and Temporal Growth of Perturbations in Open-Channel Viscous Transverse Shear Flow
著者: de Lima, Adriano C. 著作を一覧する
Izumi, Norihiro 著作を一覧する
キーワード: Spatial and temporal linear stability analysis
Open-channel viscous flow
Shear layer instability
Kinematic eddy viscosity
発行日: 2016年12月
出版者: American Society of Civil Engineers (ASCE)
誌名: Journal of hydraulic engineering
巻: 142
号: 12
開始ページ: 04016067
出版社 DOI: 10.1061/(ASCE)HY.1943-7900.0001220
抄録: The comparison between spatial and temporal growth of perturbations in a shear layer is revisited for the case of a viscous open-channel flow with velocity inflection. Turbulence is characterized by two distinct scales: a subdepth turbulence associated with the bed shear stress and a large-scale turbulence associated with the large horizontal eddies that develop in the shear layer. Temporal and spatial linear stability analyses are performed. The base flow is assumed to be affected only by the subdepth scale turbulence. Therefore, the base flow represents not the average flow but the flow completely free of the effect of the instability of the shear layer. Temporal and spatial approaches present less discrepancy in the viscous than in the previously analyzed in-viscous case. In particular, the phase velocity was found to be strongly correlated to the frequency in both the temporal and spatial approaches.
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資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: Adriano Coutinho De Lima


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