DLR Results from the Third AIAA Computational Fluid Dynamics Drag Prediction Workshop

Abstract

An overview of the German Aerospace Center results for the Third AIAA Computational Fluid Dynamics Drag Prediction Workshop is given. The investigations are focused on drag, delta drag, and pitching moments predictions for two simple wing-fuselage and two wing configurations. The DLR-F6 wing-fuselage configuration already applied in the second workshop is used and modified by a side-of-fuselage fairing to avoid an existing flow separation in the wing-fuselage junction. In addition, two simple wing configurations are investigated to allow the application of extrafine grids to grid sensitivity studies. The German Aerospace Center has used the unstructured hybrid grid and the structured grid approach in applying their Reynolds-averaged Navier-Stokes solvers TAU and FLOWer. On the one hand, the objective is to analyze the sensitivities of the DLR-F6 flow separation for different grids and the influence on the overall and delta drag using the standard Spalart-Allmaras turbulence model with Edwards modification. On the other hand, different turbulence models like the one-equation Spalart-Allmaras model, the two-equation Menter kω-shear stress transport model, and the Reynolds-stress model (SSG/LRR-ω), as well as hybrid and structured grids, are applied to the Drag Prediction Workshop wing configurations to understand their influence on the aerodynamic coefficients.