Langley Research Center Turbulence Modeling Resource

 

Jump to: SA Results,  SST Results,  SST-Vm Results,  SSG/LRR-RSM-w2012 Results,  K-kL-MEAH2015m Results EASMko2003-S Results

Return to: Mixing Layer Validation Intro Page

Return to: Turbulence Modeling Resource Home Page

2D Mixing Layer Validation Case

Wilcox2006-klim-m Model Results
 

Link to Wilcox2006-klim-m equations

Previously on this page the results were reported as Wilcox2006-klim solutions, but more properly they should be referred to as Wilcox2006-klim-m. Essentially no difference is expected.

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."

Wilcox2006-klim-m results are shown for CFL3D and FUN3D on the second-finest grid (369x369, 89x161, 121x161). Both CFL3D and FUN3D used freestream turbulence intensity=0.064%. Freestream turbulent viscosity (relative to laminar) was tried at both 0.009 and 0.9, in order to investigate the influence of freestream omega. As shown, this model exhibits influence of freestream omega boundary conditions for this case. The particular turbulence boundary conditions used in CFL3D and FUN3D correspond to: k/a_inf^2=9x10^-9, omega/(rho_inf*a_inf^2/mu_inf)=1x10^-6 and 1x10^-8. Additional details about default freestream turbulence levels can be found in the CFL3D User's Manual, Appendix H. Please read note 5 on Notes on running CFD page. Results are nearly identical between the two codes. The y value is normalized by the vorticity thickness (from experiment), the U velocity is normalized by the lower-stream U velocity as well as the change in the U velocity between lower and upper streams. The specific turbulent shear stress is normalized by the square of the change in U velocity. Note that these are compressible code results at "essentially incompressible" conditions of M=0.121108. There may be a very small influence of compressibility. The data files from CFL3D are given here: mixinglayer_cfl3d_u_w06.dat, mixinglayer_cfl3d_uv_w06.dat. (Note: some of 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_w06_2.

Note that this model is currently assigned MRR Level 2 for the purposes of this website. This is because at this time the TMBWG has results for this model from two different codes from the same home organization. The results on this page are therefore not necessarily reliable until additional independent code(s) can be used to verify the model implementation.

Jump to: SA Results,  SST Results,  SST-Vm Results,  SSG/LRR-RSM-w2012 Results,  K-kL-MEAH2015m Results EASMko2003-S Results

Return to: Mixing Layer Validation Intro Page

Return to: Turbulence Modeling Resource Home Page

Privacy Act Statement

Accessibility Statement

Responsible NASA Official: Ethan Vogel
Page Curator: Clark Pederson
Last Updated: 02/27/2025