Langley Research Center Turbulence Modeling Resource

 

Jump to: SA-QCR2000 Results, SSTm Results, SSG/LRR-RSM-w2012 Results, EASMko2003-S Results, GLVY-RSM-2012 Results

Return to: 3D Supersonic Square Duct Case Intro Page

3D Supersonic Square Duct Validation Case

SA Model Results
 

Link to SA 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 SA results from three independent CFD codes: CFL3D, FUN3D, and BCFD, along with experimental data. Inflow BCs were somewhat different: FUN3D used a farfield Riemann inflow BC, while CFL3D specified supersonic freestream conditions (it is not known what BCFD used). Both 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, with BCFD slightly offset compared to the other two codes. 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 SA model (no compressibility corrections). Some of the data files from CFL3D are given here for reference: cfl3d_result40_sa.dat, cfl3d_result50_sa.dat, cfl3d_cf50_sa.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_sa.inp. A typical FUN3D input file is: fun3d.nml_typical_sqduct_sa.

Jump to: SA-QCR2000 Results, SSTm Results, SSG/LRR-RSM-w2012 Results, EASMko2003-S Results, GLVY-RSM-2012 Results

Return to: 3D Supersonic Square Duct Case Intro Page

Recent significant updates:
02/11/2014 - added BCFD results

Privacy Act Statement

Accessibility Statement

Responsible NASA Official: Ethan Vogel
Page Curator: Clark Pederson
Last Updated: 03/17/2025