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Direct Numerical Simulation and Theories of Wall Turbulence with a Range of Pressure GradientsA new Direct Numerical Simulation (DNS) of Couette-Poiseuille flow at a higher Reynolds number is presented and compared with DNS of other wall-bounded flows. It is analyzed in terms of testing semi-theoretical proposals for universal behavior of the velocity, mixing length, or eddy viscosity in pressure gradients, and in terms of assessing the accuracy of two turbulence models. These models are used in two modes, the traditional one with only a dependence on the wall-normal coordinate y, and a newer one in which a lateral dependence on z is added. For pure Couette flow and the Couette-Poiseuille case considered here, this z-dependence allows some models to generate steady streamwise vortices, which generally improves the agreement with DNS and experiment. On the other hand, it complicates the comparison between DNS and models.
Document ID
20140016390
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Coleman, G. N.
(NASA Langley Research Center Hampton, VA, United States)
Garbaruk, A.
(Saint Petersburg State Polytechnical Univ. Saint Petersburg, Russian Federation)
Spalart, P. R.
(Boeing Commercial Airplane Co. Seattle, WA, United States)
Date Acquired
November 17, 2014
Publication Date
September 17, 2014
Subject Category
Aeronautics (General)
Report/Patent Number
NF1676L-18167
Funding Number(s)
WBS: WBS 794072.02.07.02.03
CONTRACT_GRANT: EP/G069581/1
Distribution Limits
Public
Copyright
Public Use Permitted.
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