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Weakly nonlinear models for turbulent mixing in a plane mixing layerNew closure models for turbulent free shear flows are presented in this paper. They are based on a weakly nonlinear theory with a description of the dominant large-scale structures as instability waves. Two models are presented that describe the evolution of the free shear flows in terms of the time-averaged mean flow and the dominant large-scale turbulent structure. The local characteristics of the large-scale motions are described using linear theory. Their amplitude is determined from an energy integral analysis. The models have been applied to the study of an incompressible mixing layer. For both models, predictions of the mean flow developed are made. In the second model, predictions of the time-dependent motion of the large-scale structures in the mixing layer are made. The predictions show good agreement with experimental observations.
Document ID
19930033419
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Liou, William W.
(NASA Lewis Research Center Cleveland, OH, United States)
Morris, Philip J.
(Pennsylvania State Univ. University Park, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1992
Publication Information
Publication: Physics of Fluids A
Volume: 4
Issue: 12
ISSN: 0899-8213
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
93A17416
Funding Number(s)
CONTRACT_GRANT: NAG1-657
Distribution Limits
Public
Copyright
Other

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