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how to set up wall function in bubbleFoam

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Old   October 17, 2010, 03:05
Default how to set up wall function in bubbleFoam
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trister
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Hi
I try to calculate turbulent bubbly flow by bubbleFoam. I don't know how to set up wall function in k and epsilon file in 0 folder since "bubbleColumn" tutorial doesn't treat turbulent flow and wall function. I suppose that "zeroGradient" is unreasonable. Can anyone help me?
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Old   October 18, 2010, 14:51
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Alberto Passalacqua
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Please, check the code. Wall-functions in bubbleFoam are coded directly in the solver and automatically applied when the turbulence model is active.

Best,
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Old   October 24, 2010, 04:16
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Thanks.
I found all files related turbulence e.g. wallfunctions.* are in \applications\solvers\multiohase\bubbleFoam.
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Old   November 4, 2010, 08:18
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Hi Adouchihihiitoko
Did you manage to get bubbleFoam to solve with turbulence as the RASModel ? I get the following messages,

keyword laplacian(DepsilonEff,epsilon) is undefined in dictionary "/home/f/OpenFOAM/f-1.7.0/working2/sludge2D/test2/system/fvSchemes::laplacianSchemes"

file: /home/f/OpenFOAM/f-1.7.0/working2/test2/system/fvSchemes::laplacianSchemes from line 42 to line 45.

From function dictionary::lookupEntry(const word&, bool, bool) const
in file db/dictionary/dictionary.C at line 395.
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Old   November 4, 2010, 08:57
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Laurence R. McGlashan
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Just add the entry into system/fvSchemes, and be careful using the turbulence model, it's very basic! Remember it's not using the turbulence libraries that can be used for single phase flows, so the only entry it uses in the RAS dictionary is turbulence on/off.

If you look in kEpsilon.H:

Code:
    // Dissipation equation
    fvScalarMatrix epsEqn
    (
        fvm::ddt(beta, epsilon)
      + fvm::div(phib, epsilon)
      - fvm::laplacian
        (
            alphaEps*nuEffb, epsilon,
            "laplacian(DepsilonEff,epsilon)"
        )
      ==
         C1*beta*G*epsilon/k
       - fvm::Sp(C2*beta*epsilon/k, epsilon)
    );
You can see that for the laplacian discretisation the scheme is looked up in the fvSchemes dictionary.
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Old   November 5, 2010, 06:59
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thanks Laurence
I did that and it's working. Now I'm running some test cases and it crashes after abut 50 time steps, Ur Courant number tends to diverge, but I can fiddle with it,
thanks again
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