Recent Turbulence Model Advances Applied to Multielement Airfoil Computations

A one-equation linear turbulence model and a two-equation nonlinear explicit algebraic stress model (EASM) are applied to the ow over a multielement airfoil. The e ect of the K-" and K-! forms of the two-equation model are explored, and the K-" form is shown to be de cient in the wallbounded regions of adverse pressure gradient ows. 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 mid ap. Curvature corrections are applied to both the oneand two-equation turbulence models and yield only relatively small local di erences in the ap region, where the ow eld undergoes the greatest curvature. Predictions of maximum lift are essentially una ected by the turbulence model variations studied.