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Ejection mechanisms in the sublayer of a turbulent channelThe structure of the vorticity field in the viscous wall layer of a turbulent channel is studied by examining the results of a fully resolved direct numerical simulation. It is shown that this region is dominated by intense three-dimensional shear layers in which the dominant vorticity component is spanwise. The advection and reproduction processes of these structures are examined and shown to be consistent with the classical generation mechanism for two-dimensional Tollmien-Schlichting waves. This process is fundamentally different from the usually accepted mechanism involving hairpin vortices.
Document ID
19880056874
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Jimenez, Javier
(NASA Ames Research Center Moffett Field, CA, United States)
Moin, P.
(NASA Ames Research Center Moffett Field, CA, United States)
Moser, R.
(NASA Ames Research Center Moffett Field, CA, United States)
Keefe, L.
(NASA Ames Research Center Moffett Field; Stanford University, CA, United States)
Date Acquired
August 13, 2013
Publication Date
June 1, 1988
Publication Information
Publication: Physics of Fluids
Volume: 31
ISSN: 0031-9171
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
88A44101
Distribution Limits
Public
Copyright
Other

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