Barkley, Dwight and Tuckerman, Laurette S.. (2007) Mean flow of turbulent-laminar patterns in plane Couette flow. JOURNAL OF FLUID MECHANICS, 576 . pp. 109-137. ISSN 0022-1120

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Abstract

A turbulent-laminar banded pattern in plane Couette flow is studied numerically. This pattern is statistically steady, is oriented obliquely to the stremwise direction, and has a very large wavelength relative to the gap. The mean flow, averaged in time and in the homogeneous direction, is analysed. The flow in the quasi-laminar region is not the linear Couette profile, but results from a non-trivial balance between advection and diffusion. This force balance yields a first approximation to the relationship between the Reynolds number, angle, and wavelength of the pattern. Remarkably, the variation of the mean flow along the pattern wavevector is found to be almost exactly harmonic: the flow can be represented via only three cross-channel profiles as U(x, y, z)approximate to U-o(y) + U-c(y) cos(kz) + U-s (y) sin(kz).A model is formulated which relates the cross-channel profiles of the mean flow and of the Reynolds stress. Regimes computed for a full range of angle and Reynolds number in a tilted rectangular periodic computational domain are presented. Observations of regular turbulent-laminar patterns in other shear flows - Taylor-Couette, rotor-stator, and plane Poiseuille - are compared.

Item Type:	Journal Article
Subjects:	T Technology > TJ Mechanical engineering and machinery Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF FLUID MECHANICS
Publisher:	CAMBRIDGE UNIV PRESS
ISSN:	0022-1120
Official Date:	10 April 2007
Volume:	576
Number of Pages:	29
Page Range:	pp. 109-137
Identification Number:	10.1017/S002211200600454X
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/32075

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