Analysis of Clusterization of Quasi-Streamwise Vortices in Near-Wall Turbulence
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概要
- 論文の詳細を見る
Our aim is concerned with clustering or grouping of quasi-streamwise vortices. A fact that quasi-streamwise vortices are not distributed homogeneously but intermittently populated in space in a wall layer, is shown at first by referring to a Direct Numerical Simulation(DNS)data for a channel flow. Then, Regeneration property of quasi-streamwise vortices is one of the crucially important possible mechanisms for this clustering is shown by a simplified non-dynamical simulation. Next, a wavelet decomposition of quasi-streamwise vortices in two scale-based groups is shown. The interaction between vortices of two groups indicates that individual quasi-streamwise vortices can not survive long without assistance of surrounding large scale structure which is adapted for them. Thus, it is pointed out that large scale structure around a cluster of vortices is an important coherent ctructure to be investigated more in detail.
- 一般社団法人日本機械学会の論文
- 1999-05-15
著者
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Yoshikawa Takeshi
Department Of Radiology Kobe University Graduate School Of Medicine
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Tsujimoto Koichi
Department Of Mechanophysics Osaka University
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MIYAKE Yutaka
Department of Mechanical Engineering, Osaka University
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Miyake Yutaka
Department Of Mechanical Engineering Osaka University
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Morikawa Takeshi
Yamaha Moter Cooperation
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Yoshikawa Takeshi
Department Of Mechanophysics Osaka University
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Miyake Yutaka
Department Of Mechanophysics Osaka University
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Yoshikawa Takeshi
Department Of Biochemistry And Technology Of Aquatic Resources Faculty Of Fisheries Kagoshima Univer
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