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Reynolds stress and the physics of turbulent momentum transport

Published online by Cambridge University Press:  26 April 2006

Peter S. Bernard  and
Robert A. Handler
Peter S. Bernard
Affiliation:
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
Robert A. Handler
Affiliation:
Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington, DC 20375, USA
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Abstract

The nature of the momentum transport processes responsible for the Reynolds shear stress is investigated using several ensembles of fluid particle paths obtained from a direct numerical simulation of turbulent channel flow. It is found that the Reynolds stress can be viewed as arising from two fundamentally different mechanisms. The more significant entails transport in the manner described by Prandtl in which momentum is carried unchanged from one point to another by the random displacement of fluid particles. One-point models, such as the gradient law are found to be inherently unsuitable for representing this process. However, a potentially useful non-local approximation to displacement transport, depending on the global distribution of the mean velocity gradient, may be developed as a natural consequence of its definition. A second important transport mechanism involves fluid particles experiencing systematic accelerations and decelerations. Close to the wall this results in a reduction in Reynolds stress due to the slowing of sweep-type motions. Further away Reynolds stress is produced in spiralling motions, where particles accelerate or decelerate while changing direction. Both transport mechanisms appear to be closely associated with the dynamics of vortical structures in the wall region.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 220 , November 1990 , pp. 99 - 124
Copyright
© 1990 Cambridge University Press

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