平面クエット乱流に現れる大規模ストリークの空間構造の解明(流体工学,流体機械)

概要

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The spatial structure of large scale streaks in core region of turbulent Couette flow has been studied by using data from hot-wire and smoke-wire visualization. To extract the large scale streaks, two-dimensional discrete wavelet energy spectrum and spanwise correlation of streamwise velocity u'_1 were considered. The spanwise size of the extracted large scale streaks is of the order of the channel hight (2h) and the streamwise length of (10〜40)×2h. The streak has partly a zig-zag pattern along streamwise direction and partly straight. The zig-zag pattern has (20〜25)×2h streamwise wavelength. From the visualization of cross section (x_2, x_3) there exist a large scale motion related to the streamwise vortex in core region. Some near-wall ejection motions are connected to the large scale motions.
社団法人日本機械学会の論文
2004-08-25