Reynolds-number scaling of turbulent channel flow
Reynolds-number scaling of turbulent channel flow
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DOI：
10.1063/1.4791606
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发表时间：
2013-02-01
影响因子：
4.6
通讯作者：
Flack, K. A.
中科院分区：
文献类型：
--
作者：
Schultz, M. P.;Flack, K. A.
介绍了光滑壁、充分发展的湍流通道流的实验研究结果。基于通道高度和总体平均速度的雷诺数 (Re-m) 范围为 10 000 至 300 000。目前的结果表明，当 Re-m < 62 000 时，表面摩擦系数 (C-f) 紧密遵循幂律。在较高的雷诺数下，C-f 最好用对数定律来描述。在 Re-tau = 1000-6000 的摩擦雷诺数下进行的详细两分量速度测量表明，平均流量和雷诺剪切应力几乎没有或没有雷诺数依赖性。流向雷诺正应力 (
Results of an experimental study of smooth-wall, fully developed, turbulent channel flow are presented. The Reynolds number (Re-m) based on the channel height and the bulk mean velocity ranged from 10 000 to 300 000. The present results indicate that the skin-friction coefficient (C-f) closely follows a power law for Re-m < 62 000. At higher Reynolds numbers, C-f is best described by a log law. Detailed two-component velocity measurements taken at friction Reynolds numbers of Re-tau = 1000-6000 indicate that the mean flow and Reynolds shear stress display little or no Reynolds-number dependence. The streamwise Reynolds normal stress (