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IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence DynamicsON THE POSSIBLE EXISTENCE OF A CO-SUPPORTING CYCLE OF LARGE-SCALE AND NEAR-WALL STRUCTURES IN WALL TURBULENCE

IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence... [Direct numerical simulation of a turbulent channel flow in a periodic domain of relatively wide spanwise extent, but minimal streamwise length, is carried out at Reynolds number Reτ = 349. The large-scale structures previously observed in studies of turbulent channel flow using huge computational domains are also shown to exist even in the streamwise-minimal channel of the present work. In the system, it is also clearly observed how the large-scale structures and the nearwall structures affect each other. While the collective behaviour of near-wall structures enhances a large-scale structure, the resulting large-scale structure in turn activates the generation and drift of the latter. Hence near-wall and largescale structures interact in a co-supporting cycle.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence DynamicsON THE POSSIBLE EXISTENCE OF A CO-SUPPORTING CYCLE OF LARGE-SCALE AND NEAR-WALL STRUCTURES IN WALL TURBULENCE

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/lp/springer-journals/iutam-symposium-on-elementary-vortices-and-coherent-structures-pX17G4abGw
Publisher
Springer Netherlands
Copyright
© Springer 2006
ISBN
978-1-4020-4180-8
Pages
81 –91
DOI
10.1007/1-4020-4181-0_8
Publisher site
See Chapter on Publisher Site

Abstract

[Direct numerical simulation of a turbulent channel flow in a periodic domain of relatively wide spanwise extent, but minimal streamwise length, is carried out at Reynolds number Reτ = 349. The large-scale structures previously observed in studies of turbulent channel flow using huge computational domains are also shown to exist even in the streamwise-minimal channel of the present work. In the system, it is also clearly observed how the large-scale structures and the nearwall structures affect each other. While the collective behaviour of near-wall structures enhances a large-scale structure, the resulting large-scale structure in turn activates the generation and drift of the latter. Hence near-wall and largescale structures interact in a co-supporting cycle.]

Published: Jan 1, 2006

Keywords: Direct Numerical Simulation; Turbulent Intensity; Outer Region; Minimal Channel; Spanwise Wavelength

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