CFD Sensitivity Analysis of a Drag Prediction Workshop Wing/Body Transport Configuration

Abstract

The current work re-visits calculations for the First AIAA Drag Prediction Workshop (DPW-I) configuration and uses a grid convergence study to evaluate the quantitative effects of discretization error on the code-tocode variation of forces and moments. Four CFD codes commonly used at NASA Langley Research Center are used in the study: CFL3D and OVERFLOW are structured grid codes, and NSU3D and FUN3D are unstructured grid codes. Although the drag variation reported in the summary of DPW-I results was for the constantlift cruise condition, the focus of the current grid convergence study is a constant angle-of-attack condition (α = 0 ◦ ) near the same cruise lift in order to maintain identical boundary conditions for all of the CFD codes. Forces and