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

de Lima, Adriano C.; Izumi, Norihiro

Journal of hydraulic engineering, 2016, 142(12), 04016067

Permalink : https://hdl.handle.net/2115/64032

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アクセス権
open access
URI
https://hdl.handle.net/2115/64032
タイトル
Spatial and Temporal Growth of Perturbations in Open-Channel Viscous Transverse Shear Flow
著者
著者名
de Lima, Adriano C.
著者名
Izumi, Norihiro
言語
英語
キーワード
Spatial and temporal linear stability analysis
Open-channel viscous flow
Shear layer instability
Kinematic eddy viscosity
発行日
2016-12
出版者
American Society of Civil Engineers (ASCE)
収録物名
Journal of hydraulic engineering
巻(号)
142(12)
ページ
04016067
記述
http://ascelibrary.org/doi/10.1061/%28ASCE%29HY.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.
資源タイプ
学術雑誌論文
出版タイプ
Accepted Manuscript
PISSN
0733-9429
関連情報 (isVersionOf)
出版社版DOI
https://doi.org/10.1061/(ASCE)HY.1943-7900.0001220