High-order moments of Reynolds shear stress fluctuations in a turbulent boundary layer
High-order moments of Reynolds shear stress fluctuations in a turbulent boundary layer
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湍流边界层中雷诺剪应力波动的高阶矩
DOI：
10.1017/s002211207300234x
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发表时间：
1973
影响因子：
3.7
通讯作者：
J. D. Atkinson
中科院分区：
文献类型：
--
作者：
R. Antonia;J. D. Atkinson
累积丢弃方法被用来预测的三阶和四阶矩和湍流雷诺剪应力波动uv的概率密度，流向和正常的速度波动分别表示为u和v。这些量在湍流边界层的测量，与所需的统计数据的紫外线通过使用高速数字数据采集系统。包括u和u之间的相关性高达四阶，累积丢弃预测是在接近一致的层的内部区域的测量，但只有定性地遵循在外部间歇区域的实验结果。在后一个区域，预测的第三和第四阶矩的紫外线也得到假设的湍流和无旋波动的属性是高斯和使用一些可用的条件平均的u，v和紫外线。
The cumulant-discard approach is used to predict the third- and fourth-order moments and the probability density of turbulent Reynolds shear stress fluctuations uv, the streamwise and normal velocity fluctuations being represented by u and v respectively. Measurements of these quantities in a turbulent boundary layer are presented, with the required statistics of uv obtained by the use of a high-speed digital data-acquisition system. Including correlations between u and u up to the fourth order, the cumulant-discard predictions are in close agreement with the measurements in the inner region of the layer but only qualitatively follow the experimental results in the outer intermittent region. In this latter region, predictions for the third- and fourth-order moments of uv are also obtained by assuming that the properties of both turbulent and irrotational fluctuations are Gaussian and by using some of the available conditional averages of u, v and uv.