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Old   August 29, 2006, 03:49
Default I want to specify a inlet flow
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chris book
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I want to specify a inlet flow with backround turbulence. For this reason I have defined a inlet bc with fixed value for k and epsilon (I am using the k-e epsilon turbulence model). But the following error occurs:

--> FOAM FATAL ERROR : fixedValue is the wrong k patchField type for wall-functions on patch inlet
should be zeroGradient

I know I am using a high-Re turbulence model with wallfunctions and because of that I have to use zeroGradient at the walls.
But in my case I want to define a turbulent inlet.

Does anybody know what is going wrong or what I have to do?
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Old   August 29, 2006, 03:55
Default Yes. You have specified patch
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Hrvoje Jasak
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Yes. You have specified patch type wall for your inlet, which is not clever. You will find this either in your blockMeshDict or in the boundary file, depending where you got the mesh from.
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Old   August 29, 2006, 04:03
Default Hrv, I have defined my inle
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Hrv,

I have defined my inlet patch as type 'patch' not as wall?
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Old   August 29, 2006, 04:09
Default solved http://www.cfd-online.c
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solved

The problem was caused due an old boundary file in polymesh (blockmesh does not update it?).
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Old   August 29, 2006, 04:11
Default The code says: forAll(p
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The code says:

forAll(patches, patchi)
{
const fvPatch& curPatch = patches[patchi];

if (isType<wallfvpatch>(curPatch))
{
# include "checkPatchFieldTypes.H"


and in checkPatchFieldTypes.H

if (!isType<zerogradientfvpatchscalarfield>(k_.bounda ryField()[patchi]))
{
FatalErrorIn("wall-function evaluation")
<< k_.boundaryField()[patchi].type()
<< " is the wrong k patchField type for wall-functions on patch "
<< curPatch.name() << nl
<< " should be zeroGradient"
<< exit(FatalError);

}

As you can see, you patch IS a wall.

Hrv
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