Prograde vortices, internal shear layers and the Taylor microscale in high-Reynolds-number turbulent boundary layers

Prograde vortices, internal shear layers and the Taylor microscale in high-Reynolds-number turbulent boundary layers
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高雷诺数湍流边界层中的顺行涡流、内部剪切层和泰勒微尺度

DOI:
10.1017/jfm.2021.478
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发表时间:
2021
影响因子:
3.7
通讯作者:
Guala, Michele
Guala, Michele
中科院分区:
工程技术2区
文献类型:
--
作者:
Heisel, Michael;de Silva, Charitha M.;Hutchins, Nicholas;Marusic, Ivan;Guala, Michele

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研究了一系列高雷诺数湍流边界层的顺行展向涡核和内剪切层的统计特性。所考虑的流动跨越了广泛的雷诺数和表面粗糙度。在每一种情况下,边界层外层的最大展向涡旋核的大小与泰勒微尺度相当。相同的标度参数描述了isl上的平均厚度和速度差。结果表明,局部大涡周转时间在确定应变速率方面的重要性,限制了涡旋核和剪切层的大小。周转时间的相关性,以及更普遍的泰勒微尺度,可以通过涉及相干速度结构(如均匀动量带)与分离结构的演化剪切层的相互作用的拉伸机制来解释。
The statistical properties of prograde spanwise vortex cores and internal shear layers (ISLs) are evaluated for a series of high-Reynolds-number turbulent boundary layers. The considered flows span a wide range of both Reynolds number and surface roughness. In each case, the largest spanwise vortex cores in the outer layer of the boundary layer have size comparable to the Taylor microscale . The same scaling parameters describe the average thickness and velocity difference across the ISLs. The results demonstrate the importance of the local large-eddy turnover time in determining the strain rate confining the size of the vortex cores and shear layers. The relevance of the turnover time, and more generally the Taylor microscale, can be explained by a stretching mechanism involving the mutual interaction of coherent velocity structures such as uniform momentum zones with the evolving shear layers separating the structures.
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DOI: --
发表时间: 2013
影响因子: 3.7
作者:
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