[qwe2077]

Hi I'm using PEM fuel cell addon module in fluent.
I'm tring to model the micro porous layer to a unit cell.
But in the fuel cell module, I can give only one porocity and one contact angle to the porous cell zone.
So I need to change boundary conditions in the porous media.
then I should use UDF macro to give boundary conditions.

so I got in to the pem_user.c file and found

DEFINE_DIFFUSIVITY(diff,c,t,j_spe)
{
return pem_diff(c,t,j_spe);
}

and in the pem.h file,
real pem_diff(cell_t c, Thread *t, int j_spe);

My questions are,

1. Is there no way to see the contents of pem_diff(c,t,j_spe) ?
2. How can I use UDF Macro in the fuel cell addon module?
3. Can you give me a advise about modeling extra layer of porous media?