Turbulence statistics in smooth wall oscillatory boundary layer flow

Turbulence statistics in smooth wall oscillatory boundary layer flow
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光滑壁振荡边界层流中的湍流统计

DOI:
10.1017/jfm.2018.403
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发表时间:
2018
影响因子:
3.7
通讯作者:
Van Der A D
Van Der A D
中科院分区:
工程技术2区
文献类型:
--
作者:
Van Der A D

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本文通过在大型振荡流风洞中进行的双分量激光多普勒测量和直接数值模拟(DNS),分析了非对称振荡边界层流动的湍流特性。五个不同的雷诺数,在相对应的开始低速条纹打破,因为在这些时间的速度波动的不稳定性。特别地,流向速度波动的平坦度达到十的数量级的值,而壁法向速度波动的平坦度达到几百的值。远离壁面,在流向速度的垂直梯度为零的位置,偏斜度近似为零,平坦度近似等于3,代表正态分布。在较低的海拔高度,波动的分布基本上偏离正态分布,但被发现是很好地描述了其他标准的理论概率分布。
Turbulence characteristics of an asymmetric oscillatory boundary layer flow are analysed through two-component laser-Doppler measurements carried out in a large oscillatory flow tunnel and direct numerical simulation (DNS). Five different Reynolds numbers, at phases corresponding to the onset of low-speed streak breaking, because of the intermittency of the velocity fluctuations at these times. In particular, the flatness of the streamwise velocity fluctuations reaches values of the order of ten, while the flatness of the wall-normal velocity fluctuations reaches values of several hundreds. Far from the wall, at locations where the vertical gradient of the streamwise velocity is zero, the skewness is approximately zero and the flatness is approximately equal to 3, representative of a normal distribution. At lower elevations the distribution of the fluctuations deviate substantially from a normal distribution, but are found to be well described by other standard theoretical probability distributions.
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