Recent turbulence model advances applied to multielement airfoil computations

A one-equation linear turbulence model and a two-equation nonlinear explici t algebraic stress model (EASM) are applied to the flow over a multielement airfoil. The effect of the K-epsilon and K-w forms of the two-equation mod el are explored, and the K-epsilon form is shown to be deficient in the wal l-bounded regions of adverse pressure gradient flows. A new K-w form of EAS M is introduced. Nonlinear terms present in EASM are shown to improve predi ctions of turbulent shear stress behind the trailing edge of the main eleme nt and near the midflap. Curvature corrections are applied to both the one- and two-equation turbulence models and yield only relatively small local d ifferences in the flap region, where the flowfield undergoes the greatest c urvature. Predictions of maximum lift are essentially unaffected by the tur bulence model variations studied.