Langley Research Center Turbulence Modeling Resource

 

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3D Supersonic Square Duct Validation Case

SA-QCR2000 Model Results
 

Link to SA-QCR2000 equations

Note that thorough grid studies were not performed for validation cases such as this one. Some effort was made to ensure reasonable grid resolutions, but there may still be small noticeable discretization errors. Therefore, these validation results shown should be considered representative, but not "truth." (See NUMERICAL ANALYSIS: 3D Modified Supersonic Square Duct Validation, SA-QCR2000 Model Results for a more complete attempt at verification for this case.)

The plots shown compare the SA-QCR2000 results from three independent CFD codes: CFL3D, FUN3D, and BCFD, along with experimental data. CFL3D and FUN3D used freestream value of the SA turbulence field variable (relative to laminar)=3. BCFD used a value of 5. Please read note 5 on Notes on running CFD page. These results are from the second-finest grid (481x81x81). All codes gave fairly close results to each other. As can be seen from the last figure, this nonlinear model exhibits secondary circulation near the corners, and yields better velocity and skin friction results compared to the Boussinesq models SA and SSTm, shown on other pages. (In the figures, u_CL is the u-velocity at the center point 2y/D=2z/D=1 in whatever x-plane you are plotting.) Note that these are compressible code results using the SA-QCR2000 model with no compressibility corrections. Some of the data files from FUN3D are given here for reference: fun3d_result40_saqcr.dat, fun3d_result50_saqcr.dat, fun3d_cf50_saqcr.dat, (Note: the profiles have been interpolated using Tecplot software onto pre-set points, that may or may not correspond to the actual grid points or grid cells used in the computation.) A typical FUN3D input file is: fun3d.nml_typical_sqduct_saqcr2000.

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Last Updated: 03/17/2025