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Effects of expansion ratio on the calculation of parallel-walled backward-facing step flows - Comparison of four models of turbulenceThis paper presents a numerical study of the effects of expansion ratio on two-dimensional separating and reattaching flows in plane backward-facing step geometries with parallel walls. Closure of the Reynolds equations was achieved by four different turbulence models: k-epsilon, 'modified' k-epsilon, algebraic stress, and 'modified' algebraic stress models. The k-epsilon model relates the Reynolds stresses to the mean rate of strain through the definition of an isotropic turbulent viscosity. The more advanced algebraic stress model calculates the stresses from implicit algebraic relationships containing the stresses themselves, the mean rate of strain, and the turbulent kinetic energy and its dissipation rate. 'Modified' versions of the models employ a new dissipation rate equation whose production term was made more sensitive to streamwise curvature effects. A new nonequilibrium wall function treatment proposed by Chieng and Launder (1980) was also incorporated into each model.
Document ID
19830067011
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sindir, M. M.
(Science Applications, Inc. Combustion Science and Advanced Technology Dept., Chatsworth, CA, United States)
Date Acquired
August 11, 2013
Publication Date
June 1, 1983
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
ASME PAPER 83-FE-10
Accession Number
83A48229
Funding Number(s)
CONTRACT_GRANT: NSG-2256
Distribution Limits
Public
Copyright
Other

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