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 ----------------- 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 |
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