Advanced Turbulence Modelling of Separated Flow in a Diffuser
 D.D. Apsley,
 M.A. Leschziner
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The paper describes an investigation into the predictive performance of linear and nonlinear eddyviscosity models and differential stresstransport closures for separated flow in a nominally twodimensional, asymmetric diffuser. The test case forms part of a broader collaborative exercise between academic and industrial partners. It is demonstrated that advanced turbulence models using straindependent coefficients and anisotropyresolving closure offer tangible advantages in predictive capability, although the quality of their performance can vary significantly, depending on the details of closure approximations adopted. Certain features of the flow defy resolution by any of the closures investigated. In particular, no model resolves correctly the flow near the diffuser's inclined wall immediately downstream of the inlet corner, which may reflect the presence of a “flapping” motion associated with a highlylocalised process of unsteady separation and reattachment.
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 Title
 Advanced Turbulence Modelling of Separated Flow in a Diffuser
 Journal

Flow, Turbulence and Combustion
Volume 63, Issue 14 , pp 81112
 Cover Date
 20000101
 DOI
 10.1023/A:1009930107544
 Print ISSN
 13866184
 Online ISSN
 15731987
 Publisher
 Kluwer Academic Publishers
 Additional Links
 Topics
 Keywords

 turbulence modelling
 separated flow
 nonlinear eddyviscosity models
 differential stress models
 Industry Sectors
 Authors

 D.D. Apsley ^{(1)}
 M.A. Leschziner ^{(2)}
 Author Affiliations

 1. Department of Civil & Structural Engineering, UMIST, Manchester, M60 1QD, U.K.
 2. Department of Engineering, Queen Mary and Westfield College, University of London, London, E1 4NS, U.K.