Algebraic Nonlocal Transition Modeling of Laminar Separation Bubbles Using k−ω Turbulence Models

Abstract

Algebraic transitional extensions for the accurate computation of laminar separation bubbles are developed for use with models. The transitional model, based on integral boundary-layer parameters and transition criteria, introduces streamwise-variable weighting of the production terms in the equations and delay of the shear-stress-limiter activation. Calibration to fit available DNS data yields satisfactory results for a flat-plate reference case, for both skin-friction and velocity profiles. It is shown that the model can be adapted to different variants by appropriate calibration of coefficients. The model is then validated for two airfoil test cases, for both very low and higher Reynolds numbers, a NACA 0012 airfoil at chord-based Reynolds number and angle-of-attack and an S809 airfoil at and . For both application cases, comparison with available data is satisfactory.