Statistical properties of the local structure of homogeneous isotropic turbulence and turbulent channel flows

Hiromichi Kobayashi, Eiji Matsumoto, Naoya Fukushima, Mamoru Tanahashi, Toshio Miyauchi

研究成果: Article査読

3 被引用数 (Scopus)

抄録

Statistical properties of the local structure are investigated using the data of direct numerical simulation of homogeneous isotropic turbulence for Reλ = 60.1 ~ 287.6 and turbulent channel flows for Reτ = 180, 400, 800, and 1270. The dimensionless second invariant is used as the representative local structure, and is defined as the second invariant of a velocity gradient tensor normalized by the magnitude of the velocity gradient tensor. In homogeneous isotropic turbulence, the probability density function (pdf) profiles of the dimensionless second invariant show good agreement for different values of Reynolds number. The volume fraction, the average, and the variance of the dimensionless second invariant converge to certain values at high Reynolds number, respectively. For the turbulent channel flows, the pdf profiles of the dimensionless second invariant for different values of Reynolds number coincide very well for the distance from the wall in wall units. The probability density and the volume fraction of the dimensionless second invariant at the center of the channel are in good agreement with those of homogeneous isotropic turbulence.

本文言語English
論文番号N11
ページ(範囲)1-16
ページ数16
ジャーナルJournal of Turbulence
12
DOI
出版ステータスPublished - 2011

ASJC Scopus subject areas

  • 計算力学
  • 凝縮系物理学
  • 材料力学
  • 物理学および天文学(全般)

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