Hierarchical vortical structures extracted from turbulent fields

Hierarchical vortical structures extracted from turbulent fields
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从湍流场中提取的分层涡旋结构

DOI:
10.1088/1873-7005/ab53b1
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发表时间:
2019
影响因子:
1.5
通讯作者:
Yu Fukunishi
Yu Fukunishi
中科院分区:
工程技术4区
文献类型:
--
作者:
Masato Hirota;Yu Nishio;Seiichiro Izawa;Yu Fukunishi

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通过在惯性子区中识别三种不同尺度的单个涡,研究了各向同性湍流中层次结构之间的几何关系和相互作用。采用傅立叶带通滤波器提取涡,提取的涡用一组圆柱形涡段代替。当相邻涡之间的距离等于它们的直径时,它们的轴线趋于反平行。此外,结果表明,无论雷诺数和涡尺度如何,涡被两倍尺度的涡最强烈地拉伸。然后,被拉伸的涡和那些导致拉伸的几何关系进行了分析,并发现拉伸是特别强的两个涡是相互正交时。
Geometrical relationships and interactions among hierarchical structures in isotropic turbulence are investigated by identifying individual vortices of three different scales in the inertial subrange. Fourier bandpass filters are employed to extract the vortices, and each extracted vortex is replaced by a group of vortex segments with a cylindrical shape. The axes of neighboring vortices tend to be anti-parallel when the distance between them is equivalent to their diameter. Further, results indicate that a vortex is most strongly stretched by vortices twice the scale irrespective of the Reynolds number and the vortex scales. Then, the geometric relationships between the vortices being stretched and those that cause the stretching are analyzed, and the stretching is found to be particularly strong when the two vortices are orthogonal to each other.
局部涡旋识别标准:相互关系和统一的前景
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期刊: --
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