Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence DynamicsTHE NEAR-WALL STRUCTURES OF TURBULENT WALL FLOWS

IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence... [Models for the viscous and buffer layers over smooth walls are reviewed. It is shown that there is a family of numerically-exact nonlinear structures which account for about half of the energy production and dissipation in the wall layer. The other half can be modelled by the unsteady bursting of those structures. Many of the best-known characteristics of the wall layer, such as the lateral spacing among the streaks, are well predicted by these models. The limitations of minimal models are then discussed, and it is noted that a better approximation is to represent the velocity streaks as ‘semi-infinite’ wakes of the wall-normal velocity structures, both in the buffer and in the logarithmic layer. The consequences of this characterization on the causal relation between bursting structures are also briefly discussed.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence DynamicsTHE NEAR-WALL STRUCTURES OF TURBULENT WALL FLOWS

Download PDF
17 pages

Loading next page...
 
/lp/springer-journals/iutam-symposium-on-elementary-vortices-and-coherent-structures-OduKo082CD
Publisher
Springer Netherlands
Copyright
© Springer 2006
ISBN
978-1-4020-4180-8
Pages
53 –70
DOI
10.1007/1-4020-4181-0_6
Publisher site
See Chapter on Publisher Site

Abstract

[Models for the viscous and buffer layers over smooth walls are reviewed. It is shown that there is a family of numerically-exact nonlinear structures which account for about half of the energy production and dissipation in the wall layer. The other half can be modelled by the unsteady bursting of those structures. Many of the best-known characteristics of the wall layer, such as the lateral spacing among the streaks, are well predicted by these models. The limitations of minimal models are then discussed, and it is noted that a better approximation is to represent the velocity streaks as ‘semi-infinite’ wakes of the wall-normal velocity structures, both in the buffer and in the logarithmic layer. The consequences of this characterization on the causal relation between bursting structures are also briefly discussed.]

Published: Jan 1, 2006

Keywords: Turbulent Boundary Layer; Hairpin Vortex; Logarithmic Layer; Spanwise Wavelength; Friction Reynolds Number

There are no references for this article.