A Comparison of Several CFD Codes with Experimental Data in a Diffusing S-Duct

Computational Fluid Dynamics (CFD) simulation results for flow in a diffusing, S-duct are presented in this paper. These results were generated for the first AIAA Propulsion Aerodynamics Workshop (PAW01) using different codes, grids, turbulence models, and computers. Examples of computational grids for unstructured and structured solvers were provided by the PAW01 committee to each participant. The geometry of the test case was also provided for those interested in developing their own grids. This paper summarizes the results from that first workshop and documents the effects of grid refinement, symmetry boundary conditions, turbulence models, and codes used by the various participants from across industry and academia. The CFD studies were performed as a blind trial and are compared with the available experimental data during the workshop and within this paper. The objective of the workshop was to provide an impartial forum to present the findings, discuss the results and evaluate the effectiveness of existing computer codes and modeling techniques.