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Apply wallfunction in LES

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Old   April 14, 2010, 04:37
Default Apply wallfunction in LES
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Dr. Fabian Schlegel
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Hello Guys,

I want to apply a wall function to a wall in my LES simulation. After consulting the User Guide the boundaryField part of my 0/nuSgs file looks like this:

boundaryField
{
top
{
type zeroGradient;
}
bottom
{
type nuSgsWallFunction;
value uniform 1;
}
p1
{
type cyclic;
}
p2
{
type cyclic;
}
}

Testing this with pisoFoam and oneEqEddy SGS Model the solver runs. If I now change the nuSgsWallFunction to e.g. "bla" nothing happens, the solver is still running without any problems. Furthermore if I apply my own wallFunction (change nuSgsWallFunction to moninObukhovWallFunction) where I added: Info << "Wall function is working " << endl; to the evaluate subroutine the solver still runs without any problems but I do not see the Info text on my screen which leads my to the assumption my wallFunction is not used. Have I forgot something to enable? Or is there a bug?

kind regards,
Fabian
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Old   April 14, 2010, 08:06
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Dr. Fabian Schlegel
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Allright I dont know why, but after hours of trying it works now ...
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Old   April 16, 2010, 04:03
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Jiang
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I also have met the same problem. So I don't know if the solver is using the wallFunction or not.
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Old   April 16, 2010, 07:14
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Dr. Fabian Schlegel
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I tested this a little bit and this is not only a problem for wall functions. OpenFoam don't check if the type of boundary condition is valid. Even if you misspelled the type but you have set a value OpenFoam assumes a fixedValue type BC as default and do not inform you about your mistake. This is not a bug, but it would be good to give a hint to the user if using default.
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