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To enhance its capabilities to handle e ows with transition, a Reynolds averaged Navier ‐Stokes solver has been extended with regard to the modeling of transitional e ow regions based on transition length models and the intermittency function. Because the full coupling of the solver to an e N -method that predicts the locations of transitiononsethasnotyetbeencompleted,thepointsoflaminarseparationaresupposedtorepresentthetransition locations in a e rst step. A method and an algorithm for detecting the laminar separation points are derived, and the intermittency function and two transition length models are implemented and validated for a selected high-lift multi-element test case. The background of the implementation work and the testing of the functionalities of the algorithms are focused on. Details of the implementation, which are consequences of an underlying transition prediction strategy, are outlined. The testing is described and then documented. Nomenclature cd = drag coefe cient c f = skin-friction coefe cient cl = lift coefe cient cp = pressure coefe cient FLGlt = laminar‐ turbulent e ag for the code internal eddy

Transitional Flow Modeling and Application to High-Lift Multi-Element Airfoil Configurations