Hierarchical vortical structures extracted from turbulent fields

M. Hirota, Yu Nishio, S. Izawa, Y. Fukunishi

研究成果: Article査読

2 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号015503
ジャーナルFluid Dynamics Research
52
1
DOI
出版ステータスPublished - 2020

ASJC Scopus subject areas

  • 機械工学
  • 物理学および天文学(全般)
  • 流体および伝熱

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