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Internal Patches : Which boundary conditions?

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Old   April 20, 2010, 04:56
Default Internal Patches : Which boundary conditions?
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Jérémy Bulle
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Dear all,

I have suceeded in incoportaring a fluent mesh with internal patches.

Now I have to choose the boudary conditions I want at this patches but I can't figure out which one to choose.
Zerogradient is not the good solution.

Has anyone ever had such situation and if so what did you do?

Thanks for your help!
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Old   April 20, 2010, 20:45
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Dan, Mai-Chi and Marion
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Hi,

I've just come across this problem also.

If anyone knows of a boundary condition that causes OpenFoam to ignore the boundary (so it has no effect on the fluid flow) it would be great to hear!

Cheers,
Marion
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Old   April 21, 2010, 10:51
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Stefan Herbert
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Hi,

what do you mean with "internal patches"? Is it something like a pair "wall" - "wall-shadow"?
If so you can use the stitchMesh utility to make these faces internal.

Regards,
Stefan
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Old   April 21, 2010, 11:33
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Jérémy Bulle
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A very stupid sketch but it explains the situation very cleary

http://img714.imageshack.us/img714/21/sketchl.png
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Old   April 21, 2010, 14:26
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Stefan Herbert
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Hi,

I think I understand your problem. The boundary faces should be present twice on two different patches (otherwise they would have owners and neighbours and would therefore be internal). Find the co-located patches (e.g. by checking with paraView) and use
stitchMesh <internalPatch> <colocatedInternalPatch>
for both internal boundaries to make all the faces internal. The entry in the boundary-file should show nFaces=0 after this.

Tell me if it works
Stefan
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