Application of Reynolds Stress Models to High-Lift Aerodynamics Applications

Abstract

This chapter explores use of Reynolds stress models to high-lift aerodynamics applications. An explicit algebraic Reynolds stress model (EARSM) based on a nonlinear pressure strain rate model is implemented in an industrial CFD code for unstructured grids. The new EARSM is then used to compute the flow around typical three element high-lift devices used on transport aircraft both in 2D and 3D. For 2D mean flow, various angles of attack are investigated. Two different grids are used, one coarse grid with 35,000 nodes and fine grid with 340,000 nodes. Furthermore, a 3D take-off configuration including fuselage is computed using a computational grid with about three million grid points. For the 2D case and pre-stall angles of attack, the new EARSM makes fair predictions. For higher angles of attack, the new EARSM and the baseline EARSM show a large sensitivity to the transition point location. The original transition setting leads to a premature stall while an alternative transition setting gives predictions that are in good agreement with experiments.