Langley Research Center Turbulence Modeling Resource

 

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3D Supersonic Square Duct Validation Case

SSTm Model Results
 

Link to SSTm equations

Previously on this page the results were reported as SST solutions, but more properly they should be referred to as SSTm. It is not clear what the effect is for this solution. See discussion on 2D Zero Pressure Gradient High Mach Number Flat Plate Validation Case, SST-Vm Model Results.

Note that thorough grid studies were not performed for validation cases such as this one. Especially for 3-D cases, there may still be significant discretization errors. Therefore, these validation results shown should be considered representative, but not "truth."

The plots shown compare the SSTm results from two independent CFD codes: CFL3D and FUN3D, along with experimental data. Inflow BCs were somewhat different: FUN3D used a farfield Riemann inflow BC, while CFL3D specified supersonic freestream conditions. Both CFL3D and FUN3D used freestream turbulence intensity=0.002% and freestream turbulent viscosity (relative to laminar)=0.009 (additional details can be found in the CFL3D User's Manual, Appendix H). Please read note 5 on Notes on running CFD page. These results are from the second-finest grid (481x81x81). Both codes gave very close results to each other. As can be seen from the last figure, the results with this Boussinesq model do not exhibit any secondary circulation near the corners, as expected. (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 standard SSTm model (no compressibility corrections). Some of the data files from CFL3D are given here for reference: cfl3d_result40_sst.dat, cfl3d_result50_sst.dat, cfl3d_cf50_sst.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 CFL3D input file is: cfl3d_sqduct_typical_sst.inp. A typical FUN3D input file is: fun3d.nml_typical_sqduct_sst.

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Last Updated: 03/17/2025