Recent Turbulence Model Advances Applied to Multielement Airfoil Computations

A one-equation linear turbulence model and atwo-equation nonlinear explicit algebraic stress model (EASM) are applied to the flow over a multielement airfoil. The effect of the K-" and K-! forms of the two-equation model are explored, and the K-" form is shown to be deficient in the wallbounded regions of adverse pressure gradient flows. A new K-! form of EASM is introduced. Nonlinear terms present in EASM are shown to improve predictions of turbulent shear stress behind the trailing edge of the main element and near midflap. Curvature corrections are applied to both the one- and two-equation turbulence models and yield only relatively small local differences in the flap region, where the flow field undergoes the greatest curvature. Predictions of maximum lift are essentially unaffected by the turbulence model variations studied.