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Turbulent flow past a backward-facing step - A critical evaluation of two-equation modelsThe ability of two-equation models to accurately predict separated flows is analyzed from a combined theoretical and computational standpoint. Turbulent flow past a backward facing step is chosen as a test case in an effort to resolve the variety of conflicting results that were published during the past decade concerning the performance of two-equation models. It is found that the errors in the reported predictions of the k-epsilon model have two major origins: (1) numerical problems arising from inadequate resolution, and (2) inaccurate predictions for normal Reynolds stress differences arising from the use of an isotropic eddy viscosity. Inadequacies in near wall modelling play a substantially smaller role. Detailed calculations are presented which strongly indicate the standard k-epsilon model - when modified with an independently calibrated anisotropic eddy viscosity - can yield surprisingly good predictions for the backstep problem.
Document ID
19920054223
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Thangam, S.
(NASA Langley Research Center Hampton, VA, United States)
Speziale, C. G.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1992
Publication Information
Publication: AIAA Journal
Volume: 30
Issue: 5 Ma
ISSN: 0001-1452
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
92A36847
Funding Number(s)
CONTRACT_GRANT: NAS1-18605
Distribution Limits
Public
Copyright
Other

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