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Boundary Condition of internal Faces

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Old   August 26, 2005, 01:38
Default Boundary Condition of internal Faces
  #1
Gernot
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Which boundary condition do I have to use for an internal face. That means a face which only connect two volumes without any function.

I declared these faces without any boundary condition, but is it right or do I have to take anotherone, e.g. internal or interior ?

Thanks Gernot
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Old   August 26, 2005, 02:39
Default Re: Boundary Condition of internal Faces
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Ralf Schmidt
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hi

use "internal" as BC, but take care, that the face is shared by two volumes. Otherwise Fluent will transform it into a wall.

Refere also to

http://www.cfd-online.com/Forum/fluent.cgi?read=30516

Ralf
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Old   August 26, 2005, 03:59
Default Re: Boundary Condition of internal Faces
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Gernot
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What happens when I don't define this face. So the internal face has got nothing boundary condition. My computation works with this setup, but I haven't seen the results.
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Old   August 26, 2005, 04:14
Default Re: Boundary Condition of internal Faces
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Ralf Schmidt
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as far as I know, every face that is not defined will be transformed by Fluent into a wall.
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Old   August 26, 2005, 05:05
Default Re: Boundary Condition of internal Faces
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edi
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Every undefined face AT THE BOUNDARY is set as "wall" by gambit when generating the msh file. When you have a face shared by two volumes is automatically set as "interior" if unspecified, that is: simply no need for inputs from you.

Edi.
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Old   August 26, 2005, 13:02
Default Re: Boundary Condition of internal Faces
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Gernot
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thanks a lot for the statements my friends !!!
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