This paper was presented at the 39th AIAA Fluid Dynamics Conference, San Antonio, Texas, June 22-25, 2009. Copyright © 2009 by the American Institute of Aeronautics and Astronautics. It is available from http://www.aiaa.org/content.cfm?pageid=406. It appears here with the permission of the American Institute of Aeronautics and Astronautics Inc.This paper aims to give an overview of the more widely used approaches to model transition\ud in Computational Fluid Dynamics (CFD). Eight different methods are reviewed: the\ud stability theory approach, the low Reynolds number turbulent closure approach, the intermittency\ud transport method with integral correlations, the intermittency and the vorticity\ud Reynolds number approach, the laminar fluctuation energy method, the ν/-2- f model, and\ud the Large Eddy Simulations (LES) and Direct Numerical Simulations (DNS) for transition.\ud The approaches are compared to one another, highlighting their respective advantages and\ud drawbacks. From this analysis, a list of desirable features for CFD transition models is\ud drawn up, against which the eight approaches are scored
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