NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Eddies, streams, and convergence zones in turbulent flowsRecent studies of turbulent shear flows have shown that many of their important kinematical and dynamical properties can be more clearly understood by describing the flows in terms of individual events or streamline patterns. These events or flow regions are studied because they are associated with relatively large contributions to certain average properties of the flow, for example kinetic energy, Reynolds stress, or to particular processes in the flow, such as mixing and chemical reactions, which may be concentrated at locations where streamlines converge for fast chemical reactions (referred to as convergence or C regions), or in recirculating eddying regions for slow chemical reactions. The aim of this project was to use the numerical simulations to develop suitable criteria for defining these eddying or vortical zones. The C and streaming (S) zones were defined in order to define the whole flow field. It is concluded that homogeneous and sheared turbulent flow fields are made up of characteristic flow zones: eddy, C, and S zones. A set of objective criteria were found which describe regions in which the streamlines circulate, converge or diverge, and form high streams of high velocity flow.
Document ID
19890015184
Document Type
Conference Paper
Authors
Hunt, J. C. R. (Cambridge Univ. (England). Moffett Field, CA., United States)
Wray, A. A. (NASA Ames Research Center CA, United States)
Moin, P. (Stanford Univ.)
Date Acquired
September 5, 2013
Publication Date
December 1, 1988
Publication Information
Publication: Studying Turbulence Using Numerical Simulation Databases, 2. Proceedings of the 1988 Summer Program
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 19890015184.pdf STI