Length scales in turbulent channel flow

Koji Morishita, Takashi Ishihara, Yukio Kaneda

Research output: Contribution to journalArticlepeer-review

Abstract

The position- and direction-dependence of length scales in turbulent channel flow was studied using the data from a series of direct numerical simulations (DNSs) of turbulent channel flow with the wall Reynolds number and the number of grid points ranging up to 5120 and 2048 × 1536 × 2048, respectively. According to the DNSs, there is a region of y in which the mean flow profile fits well with the log-law (log-law region), where y is the distance from the wall. The Taylor microscale is anisotropic, but has a simple y-dependence (∝ y1=2) in this region. The two-point fluctuating-velocity correlation at ∣r∣ ∼ y is also anisotropic and approximately depends on r through r=‘ðyÞ, where r is the displacement vector between two points, ‘ðyÞ is a function of only y, and ‘ðyÞ is close to, but not exactly equal to y.

Original languageEnglish
Article number064401
JournalJournal of the Physical Society of Japan
Volume88
Issue number6
DOIs
Publication statusPublished - Jan 1 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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