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"calculated " boundary condition

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Old   January 28, 2010, 05:13
Default "calculated " boundary condition
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sunil
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hi,
how to apply calculated type of primitive patch field. i have a relation between p and v at that boundary (patch) , say p=constant * v. so how should i write p and v boundary condition for that patch.
is there anybody who can help me..............

Last edited by suniljain; February 19, 2010 at 00:31.
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Old   January 28, 2010, 09:28
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Stefan Herbert
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Hi,

I think one way to solve your problem was the following. (But its only a suggest and surely not the only one)

1. set boundaryType for U to zeroGradient
2. set boundaryType for p to fixedValue
3. solve Eqns
4. set value on boundary of p to C*U
5. repeat steps 3-4 and hope for convergence

Does anyone know about a more elegant solution?

Regards
Stefan
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Old   January 28, 2010, 13:22
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Bernhard Gschaider
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Quote:
Originally Posted by suniljain View Post
hi,
how to apply calculated type of primitive patch field. i have a relation between p and v at that boundary (patch) , say p=constant * v. so how should i write p and v boundary condition for that patch.
is there anybody who can help me.
I may be biased ("If you've got a hammer, every problem looks to you like a nail", and if you wrote the hammer it is worse), but http://openfoamwiki.net/index.php/Contrib_groovyBC may help you (at least for prototyping such a kind of boundary condition)

Bernhard
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