TY - JOUR

T1 - Length scales in turbulent channel flow

AU - Morishita, Koji

AU - Ishihara, Takashi

AU - Kaneda, Yukio

N1 - Funding Information:
This study has been partly supported by a Grant-in-Aid for Scientific Research (C) 26400410 from the Japan Society for the Promotion of Science.
Funding Information:
Acknowledgment This study has been partly supported by a Grant-in-Aid for Scientific Research (C) 26400410 from the Japan Society for the Promotion of Science.
Publisher Copyright:
©2019 The Physical Society of Japan

PY - 2019

Y1 - 2019

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 -