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Eddies, streams, and convergence zones in turbulent flows
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Author and Affiliation:
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.)
Abstract: Recent 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.
Publication Date: Dec 01, 1988
Document ID:
19890015184
(Acquired Nov 06, 1995)
Accession Number: 89N24555
Subject Category: FLUID MECHANICS AND HEAT TRANSFER
Document Type: Conference Paper
Publication Information: Studying Turbulence Using Numerical Simulation Databases, 2. Proceedings of the 1988 Summer Program; p. p 193-208
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Stanford Univ.; CA, United States
Description: 16p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: DIGITAL SIMULATION; FLOW DISTRIBUTION; FLOW VELOCITY; SHEAR FLOW; TURBULENT FLOW; VELOCITY DISTRIBUTION; COMPUTATIONAL FLUID DYNAMICS; CONVERGENCE; FLOW STABILITY; STREAM FUNCTIONS (FLUIDS); VORTICES
Imprint And Other Notes: In its Studying Turbulence Using Numerical Simulation Databases, 2. Proceedings of the 1988 Summer Program p 193-208 (SEE N89-24538 18-34)
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