| Popis: |
st AIAA CFD High Lift Prediction Workshop, the NASA Trap Wing wind tunnel model is analyzed using the Reynolds-averaged Navier-Stokes (RANS) flow solver OVERFLOW. A family of structured, overset grids built for the workshop consists of a coarse (10.7 million points), medium (25.0 million points), fine (83.3 million points), and extra-fine (281.6 million points) mesh. Additional grids are built to study effects of slat and flap support brackets and off-body flow features such as a tip vortex. The OVERFLOW results are post-processed using Richardson extrapolation to evaluate grid convergence at 13 o and 28 o angle-of-attack. The medium grid is analyzed further to study effects of solution algorithm, flap deflection, and support brackets across a full range of CL including stall. Preliminary results from an off-body grid refinement study based on an automated grid adaption capability in OVERFLOW are also presented. Computed forces, moments, and pressures are plotted against experiment to access CFD data levels and trends. In general, OVERFLOW predictions for the Trap Wing model agree very well with wind tunnel data. |
