v2f turbulence model cannot predict boundary layer
 

Dear Foamers,

I am struggling with applying the basic v2f model (v1806) to simple flows, e.g. backward-facing step (low-Re) or Chow's wing testcase (high-Re). Below you can see the upper wall w/o step of the backward-facing step (BFS) and the suction side of Chow's wing both with SSTCC (Smirnov) and the v2f model.

The problem is that the boundary layer does not develop properly with v2f. I tested a lot of different combinations of the boundary conditions without success. Here you see the BCs from the pitzDaily tutorial for the high-Re Case.


backward-facing step:
SSTCC:


low-Re no slip condition with
k: kLowReWallFunction
omega: omegaWallFunction
nut: nutLowReWallFunction

https://i.postimg.cc/fJkzNmxX/BFS-sstcc.png

v2f:


low-Re no slip condition with
k: kLowReWallFunction
epsilon: epsilonWallFunction, lowReCorrection=on
f: fWallFunction
nut: nutUWallFunction (see source code: "turbulent viscosity wall function should be used")
v2: v2WallFunction


https://i.postimg.cc/hQz5CDdJ/BFS-v2f.png


--------------------------
Chow's testcase:

SST-CC:
high-Re no slip condition with
k: kqRWallFunction
omega: omegaWallFunction
nut: nutkWallFunction

https://i.postimg.cc/75Ks3JCH/Chow-k...ity-Glyphs.png




v2f:
high-Re no slip condition with
k: kqRWallFunction
epsilon: epsilonWallFunction, lowReCorrection off
f: fWallFunction
nut: nutkWallFunction
v2: v2WallFunction


https://i.postimg.cc/944py85b/Chow-v...ity-Glyphs.png

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Did you experience similar issues? And did you find a solution for it?


Remark: Also asked here: https://www.cfd-online.com/Forums/op...tml#post737967