Langley Research Center Turbulence Modeling Resource

 

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3D Supersonic Square Duct Validation Case

SSG/LRR-RSM-w2012 Model Results
 

Link to SSG/LRR-RSM-w2012 equations

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 SSG/LRR-RSM-w2012 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 results that were qualitatively similar to each other. As can be seen from the last figure, this nonlinear model exhibits secondary circulation near the corners. (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.) Some of the data files from CFL3D are given here for reference: cfl3d_result40_ssglrrrsm.dat, cfl3d_result50_ssglrrrsm.dat, cfl3d_cf50_ssglrrrsm.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_ssglrrrsm.inp. A typical FUN3D input file is: fun3d.nml_typical_sqduct_ssglrr.

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Last Updated: 03/17/2025