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2D Airfoil Near-Wake Validation Case
K-kL-MEAH2015m Model Results
Link to k-kL-MEAH2015m equations
Previously on this page the results were reported as k-kL-MEAH2015 solutions, but more properly they should be referred
to as k-kL-MEAH2015m. 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."
(See VERIF/2DANW for a verification version of this airfoil case.)
IMPORTANT NOTE: This validation case uses grids that only extend 20c from the airfoil.
It was later discovered that this farfield grid extent is too small for verification purposes.
Therefore, any results using only 20c grid extent should be viewed WITH CAUTION.
The verification case using 500c grid extent can be found at the link above.
K-kL-MEAH2015m results are shown for CFL3D, FUN3D, and TAU on the
second-finest grid (1121x193).
Both CFL3D and FUN3D used freestream turbulence intensity=0.088% and freestream turbulent viscosity (relative to laminar)=0.009
(additional details can be found in the CFL3D User's Manual, Appendix H),
while TAU used freestream turbulence intensity=0.1% and freestream turbulent viscosity (relative to laminar)=0.1.
Please read note 5 on Notes on running CFD page.
(On this grid level, CL=0.1580 and CD=0.01022 for CFL3D and CL=0.1562 and CD=0.01026 for FUN3D.)
Note that these are compressible code results at "essentially incompressible" conditions of M=0.088.
There may be a very small influence of compressibility.
The data files from CFL3D are given here:
nak_cfl3d_vel_kkl.dat,
nak_cfl3d_uv_kkl.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:
nak_cfl3d_typical_kkl.inp.
A typical FUN3D input file is:
fun3d.nml_typical_kkl_2.
Jump to: SA Results,
SSTm Results,
SSG/LRR-RSM-w2012 Results,
Wilcox2006-klim-m Results,
EASMko2003-S Results,
K-e-Rt Results Return to: 2D Airfoil Near-Wake Case Intro Page Return to: Turbulence Modeling Resource Home Page
Recent significant updates: Responsible NASA Official:
Ethan Vogel
02/02/2018 - added TAU results
Page Curator:
Clark Pederson
Last Updated: 03/03/2025