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The production of turbulent stress in a shear flow by irrotational fluctuationsAttention is given to the way in which external turbulence affects an initially turbulence-free region in which there is a mean velocity gradient. External turbulence induces irrotational fluctuations in the sheared region which interact with the shear to produce rotational velocity fluctuations and mean Reynolds stresses. Since the actual front between the initial external turbulence and the shear flow is a randomly contorted surface, the turbulence near the front is intermittent, and is presently included in the form of a simple statistical model. In wind tunnel tests, turbulent shear stress was found to grow from zero to significant values in the interaction region. Observed stress magnitude and extent agrees with predictions, and it is concluded that turbulent stresses can be produced by irrotational fluctuations in a region of mean shear.
Document ID
19840038603
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gartshore, I. S.
(British Columbia, University Vancouver, Canada)
Durbin, P. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Hunt, J. C. R.
(Cambridge University Cambridge, United Kingdom)
Date Acquired
August 12, 2013
Publication Date
December 1, 1983
Publication Information
Publication: Journal of Fluid Mechanics
Volume: 137
ISSN: 0022-1120
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
84A21390
Distribution Limits
Public
Copyright
Other

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