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The mechanism of streak formation in near-wall turbulence

The mechanism of streak formation in near-wall turbulence
The mechanism of streak formation in near-wall turbulence
Two conceptual frameworks for the origin of the streaky pattern in near-wall developed turbulent flows are compared. According to the framework that dominated the research over several decades, the pattern of streaks is dictated by the pattern of wall-normal motions via the lift-up mechanism. Various concepts within this framework describe the wall-normal motions as induced by longitudinal vortices, hairpin vortices, vortex packets, etc. According to the newly emerging conceptual framework, the combined action of lift-up of the mean profile, mean shear, and viscous diffusion has its own pattern-forming properties. The pattern of streaks is dictated by these linear effects to a much greater extent than by the pattern of the wall-normal motions. Numerical results supporting the new conceptual framework are presented. An approximate approach for calculating the streak spacing within the new framework is proposed. It is shown to have a significant predictive ability.
0022-1120
99-131
Chernyshenko, S.I.
6fef97f7-e668-45f7-8fef-7a4cd4cb1fb2
Baig, M.F.
e618bead-e673-4726-a3ad-ee307203a9a0
Chernyshenko, S.I.
6fef97f7-e668-45f7-8fef-7a4cd4cb1fb2
Baig, M.F.
e618bead-e673-4726-a3ad-ee307203a9a0

Chernyshenko, S.I. and Baig, M.F. (2005) The mechanism of streak formation in near-wall turbulence. Journal of Fluid Mechanics, 544 (n/a), 99-131. (doi:10.1017/S0022112005006506).

Record type: Article

Abstract

Two conceptual frameworks for the origin of the streaky pattern in near-wall developed turbulent flows are compared. According to the framework that dominated the research over several decades, the pattern of streaks is dictated by the pattern of wall-normal motions via the lift-up mechanism. Various concepts within this framework describe the wall-normal motions as induced by longitudinal vortices, hairpin vortices, vortex packets, etc. According to the newly emerging conceptual framework, the combined action of lift-up of the mean profile, mean shear, and viscous diffusion has its own pattern-forming properties. The pattern of streaks is dictated by these linear effects to a much greater extent than by the pattern of the wall-normal motions. Numerical results supporting the new conceptual framework are presented. An approximate approach for calculating the streak spacing within the new framework is proposed. It is shown to have a significant predictive ability.

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Published date: 2005

Identifiers

Local EPrints ID: 23517
URI: https://eprints.soton.ac.uk/id/eprint/23517
ISSN: 0022-1120
PURE UUID: db412cb1-4cf3-40bc-bc06-a99a0f559ccd

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Date deposited: 20 Mar 2006
Last modified: 17 Jul 2017 16:17

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