Abstract
This paper summarises recent progress which has been made in evaluating by-pass transition models as part of a European Research Community On Flow Turbulence And Combustion (ERCOFTAC) Special Interest Group Project. In particular new results, from a variety of closure models, are presented for a wider range of Test Cases based on both experimental studies and Direct Numerical Simulations. It would appear that a Reynolds stress scheme offers the best predictive capability for 2D by-pass transition under high free-stream turbulence intensities and variable pressure gradient or Reynolds number conditions. Such a scheme also has the potential to handle both anisotropic and lower intensity free-stream turbulence effects. However present low-Re treatments need to be refined against DNS for transitional flow (so that a clearer distinction can be made between low-Re near-wall and low-Re transition region modelling) before additional curvature, heat transfer and leading edge separation effects can be considered.
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