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A new 3D transition turbulence model, more accurate and faster than anempirical transition model, is proposed. The model is based on the calculationof the pre-transitional u'v' due to mean flow shear. The present transitionmodel is fully described and verified against eight benchmark test cases.Computations are performed for the ERCOFTAC flat-plate T3A, T3C and T3L testcases. Further, the model is validated for bypass, cross-flow and separationinduced transition and compared with empirical transition models. The modelpresents very good results for bypass transition under zero-pressure gradientand with pressure gradient flow conditions. Also the model is able to correctlypredict separation induced transition. However, for very low speed and lowfree-stream turbulence intensity the model delays separation induced transitiononset. The model also shows very good results for transition under complexcross-flow conditions in three-dimensional geometries. The 3D tested case wasthe 6:1 prolate-spheroid under three flow conditions.

Development and validation of a transition model based on a mechanical approximation