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首页> 外文期刊>Journal of Fluid Science and Technology >Re-evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statistics
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Re-evaluating wake width in turbulent shear flow behind an axisymmetric cylinder by means of higher order turbulence statistics

机译：通过更高阶的湍流统计量重新评估轴对称圆柱体后面的湍流剪切流中的尾流宽度

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摘要

The free turbulent shear flow behind a long axisymmetric cylinder, i.e., a wake, is two-dimensional in nature and is composed of inner shear turbulence and outer potential, irrotational flow (free stream) regions. The conventional definitions of wake width, l_(u) , are based on the mean velocity field, namely, the first order statistic of turbulence. Two alternative definitions of wake width, l_(S) = 2_(yS) and l_(F) = 2_(yF) , are proposed in terms of skewnes and flatness factors, respectively, which are considered as third- and fourth-order statistics of turbulence in this study. Between these two new definitions of wake width, l_(F) can represent a more proper sectional range of shea turbulence in a wake.
机译：在长轴对称圆柱体（即尾流）之后的自由湍流剪切流本质上是二维的，由内部剪切湍流和外部势能，非旋转流（自由流）区域组成。尾流宽度的传统定义是基于平均速度场，即湍流的一阶统计量。根据偏斜度和平坦度系数，提出了尾流宽度的两个替代定义，即 l_（S）= 2 _（yS）和 l_（F）= 2 _（yF） ，分别被认为是本研究中湍流的三阶和四阶统计量。在这两个新的尾流宽度定义之间，i_（F）可以表示尾流中牛油树脂湍流的更合适的截面范围。

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