Using UDF in fuel cell addon module
 

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?

fuel cell module addon_code
 

hi, dear

to see the content of the addon code of fuel cell please follow the directories "C:\Program Files\ANSYS Inc\v145\fluent\fluent14.5.0\addons"

you can make change to the pem code and do the recompilation again.
see the attached pdf file for more datails.

Hi walied123 thanks for your reply.

yes I know Ansys provides user-accessable-functions in pem_user.c file in addons/src folder as you mentioned.

I want to see and change the contents of UDF of source terms and charge transfer conservation.

In the C-file, I couldn't find any content of them.

please help me

If you want to see the equations how these source terms are calculated by default..check the fuel cell manual..it is given over there...

Thanks again maverick.

I've checked out the fuel cell manual. It was a lot of help.

How can I see the c-code of default source terms and UDS flux, UDS diffusion?

Are they not opened to see?

There are only declare exression in C file and I can't find the C-code contents of those UDS function.

I think, you can not see it as it is not available for Users. But you can modify it for sure with your code/equations.