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changing boundary conditions

Posted Aug 10, 2010, 11:57 a.m. EDT 0 Replies

Andras Gilicz
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Dear Ivar, dear COMSOL fans

I have a 1D porous media flow with the following bondary conditions:

@ x=0: p=p_in ; C1 * dp_in/dt = partialp/partialx
@ x=L: p=p_out ; C2 * dp_out/dt = -partialp/partialx

Because partialp/partialx is actually proportional to the in- and outflow fluid velocity, this can also be written:

@ x=0: p=p_in ; C1' * dp_in/dt = v_in
@ x=L: p=p_out ; -C2' * dp_out/dt = v_out

How can I specify this to COMSOL? Here p is the pressure in the porous medium, C1, C2, C1' and C2' are known constants. I use COMSOL V4 and the Earth Science module.

Any help, advise or example would be gratefully appreciated.
Tx in advance, best regards

Andras
0 Replies Last Post Aug 10, 2010, 11:57 a.m. EDT
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Hello Andras Gilicz

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