Letter: The link between the Reynolds shear stress and the large structures of turbulent Couette-Poiseuille flow

被引：22

作者：

Gandia-Barbera, Sergio ^{[1
]}

Hoyas, Sergio ^{[1
]}

Oberlack, Martin ^{[2
,3
]}

Kraheberger, Stefanie ^{[2
,3
]}

机构：

[1] Univ Politecn Valencia, Inst Univ Matemat Pura & Aplicada, Valencia, Spain

[2] Tech Univ Darmstadt, Chair Fluid Dynam, Otto Berndt Str 2, D-64287 Darmstadt, Germany

[3] Tech Univ Darmstadt, Grad Sch Excellence Computat Engn, Dolivostr 15, D-64293 Darmstadt, Germany

来源：

PHYSICS OF FLUIDS | 2018年 / 30卷 / 04期

关键词：

CHANNEL FLOW; SCALE MOTIONS; STATISTICS; SIMULATIONS; VELOCITY; DNS;

D O I：

10.1063/1.5028324

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The length and width of the long and wide structures appearing in turbulent Couette flows are studied by means of a new dataset of direct numerical simulation covering a stepped transition from pure Couette flow to pure Poiseuille one, at Re-tau approximate to 130, based on the stationary wall. The existence of these structures is linked to the averaged Reynolds stress, (uv) over bar : as soon as in any part of the channel (uv) over bar changes its sign, the structures disappear. The length and width of the rolls are found to be, approximately, 50h and 2.5h, respectively. For this Reynolds number, simulations with a domain shorter than 100h cannot properly describe the behaviour of the longest structures of the flow. Published by AIP Publishing.

引用

页数：4

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