REVIEW ARTICLES: Turbulence Theories and Models Incorporating Experimental and Computer Simulation Knowledge of Coherent Structures

Dynamical Significance of Turbulent Wall Layer Streaks

[+] Author and Article Information
P. S. Bernard

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

R. A. Handler

Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington, DC 20375

Appl. Mech. Rev 43(5S), S219-S226 (May 01, 1990) doi:10.1115/1.3120811 History: Online April 30, 2009


The role of low speed streaks in the dynamical processes leading to the generation of Reynolds stress is investigated using ensembles of computed particle paths obtained from a direct numerical simulation of turbulent channel flow. Simultaneous visualization of appropriate Eulerian fields and trajectories of fluid particles which are most indicative of Reynolds stress production are given. These graphically illustrate the occurrence of ejection events at a series of discrete locations along low speed streaks. A strong association between streamwise vortices and the ejecting fluid is found. In particular, visualization of the ejecting fluid shows the presence of vortices which drive fluid from the sides up and over the low speed regions. As part of this process fluid from within the streaks appears to be entrained outward from the wall. Some of the implications of these results for turbulence modeling will be described.

Copyright © 1990 by American Society of Mechanical Engineers
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