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首页> 外文期刊>International Journal of Heat and Fluid Flow >Near-wall behavior of turbulent wall-bounded flows
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Near-wall behavior of turbulent wall-bounded flows

机译：湍流边界流的近壁行为

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摘要

A data base compiling a large number of results from direct numerical simulations and physical experiments is used to explore the properties of shear and normal Reynolds stresses very close to the wall of turbulent channel/pipe flows and boundary layers. Three types of scaling are mainly investigated, classical inner, standard mixed, and pure outer scaling. The study focuses on the wall behavior, the location and the value of the peak Reynolds shear stress and the three normal stresses. A primary observation is that all of these parameters show a significant Karman number dependence. None of the scalings investigated works in an equal manner for all parameters. It is found that the respective first-order Taylor series expansion satisfactorily represents each stress only in a surprisingly thin layer very close to the wall. In some cases, a newly introduced scaling based on u_τ~(3/2)u_e~(1/2) offers a remedy.
机译：使用数据库收集了直接数值模拟和物理实验的大量结果，用于探索非常接近湍流通道/管道壁和边界层壁的切应力和法向雷诺应力的特性。主要研究三种类型的缩放比例，经典内部缩放比例，标准混合缩放比例和纯外部缩放比例。该研究集中在壁的行为，雷诺峰值剪切应力和三个法向应力的位置和值上。主要观察到所有这些参数都显示出显着的卡曼数依赖性。对于所有参数，所研究的缩放比例均无法以相同的方式工作。发现相应的一阶泰勒级数展开仅在非常靠近壁的令人惊讶的薄层中令人满意地表示每个应力。在某些情况下，新引入的基于u_τ〜（3/2）u_e〜（1/2）的缩放比例提供了一种补救方法。

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