Effect of Flow Structures on Turbulence Statistics of Taylor-Couette Flow in the Torque Transition State

被引：2

作者：

Osawa, K. ^{[1
]}

Naka, Y. ^{[2
]}

Fukushima, N. ^{[3
]}

Shimura, M. ^{[1
]}

Tanahashi, M. ^{[1
]}

Miyauchi, T. ^{[4
]}

机构：

[1] Tokyo Inst Technol, Dept Mech & Aerosp Engn, Meguro Ku, 2-12-1 Ookayama, Tokyo, Japan

[2] Meiji Univ, Dept Mech Engn, Tama Ku, 1-1-1 Higashimita, Kawasaki, Kanagawa, Japan

[3] Tokyo Univ Sci, Dept Mech Engn, Katsushika Ku, 6-3-1 Niijuku, Tokyo, Japan

[4] Meiji Univ, Org Strateg Coordinat Res & Intellectual Properti, Tama Ku, 1-1-1 Higashimita, Kanagawa, Japan

来源：

FLOW TURBULENCE AND COMBUSTION | 2016年 / 97卷 / 04期

基金：

日本学术振兴会;

关键词：

Taylor-couette flow; Turbulence; Transition; Mean torque; Direct numerical simulation; DIRECT NUMERICAL-SIMULATION;

D O I：

10.1007/s10494-016-9770-1

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Direct numerical simulations of Taylor-Couette flow from R e= 8000 to 25000 have been conducted to investigate changes of turbulence statistics in the transition of the Reynolds number dependency of the mean torque near R e= 10000. The velocity fluctuations are decomposed into the contributions of the Taylor vortex and remaining turbulent fluctuations. Significant Reynolds number dependencies of these components are observed in the radial profiles of the Reynolds stress and the transmission of the mean torque. The contributions of Taylor vortex and turbulent components in the net amount of mean torque are evaluated. The Taylor vortex component is overtaken by the turbulent counterpart around R e= 15000 when they are defined as the azimuthally averaged component and the remnants. The results show that the torque transition can be explained by the competition between the contributions of azimuthally averaged Taylor vortex and the remaining turbulent components.

引用

页码：973 / 986

页数：14

共 21 条

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