### 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 (∝ y^{1}=^{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 language | English |
---|---|

Article number | 064401 |

Journal | Journal of the Physical Society of Japan |

Volume | 88 |

Issue number | 6 |

DOIs | |

Publication status | Published - Jan 1 2019 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Journal of the Physical Society of Japan*,

*88*(6), [064401]. https://doi.org/10.7566/JPSJ.88.064401

**Length scales in turbulent channel flow.** / Morishita, Koji; Ishihara, Takashi; Kaneda, Yukio.

Research output: Contribution to journal › Article

*Journal of the Physical Society of Japan*, vol. 88, no. 6, 064401. https://doi.org/10.7566/JPSJ.88.064401

}

TY - JOUR

T1 - Length scales in turbulent channel flow

AU - Morishita, Koji

AU - Ishihara, Takashi

AU - Kaneda, Yukio

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85067276090&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85067276090&partnerID=8YFLogxK

U2 - 10.7566/JPSJ.88.064401

DO - 10.7566/JPSJ.88.064401

M3 - Article

AN - SCOPUS:85067276090

VL - 88

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 6

M1 - 064401

ER -