Hi,

For transient calculations of a non reacting system with 2 inlets (one for gas A and one for gas B) and one outlet for a mixture A+B,

I have to report the mass fraction of B as a function of time step for ALL the cells at the outlet.

Any one know hows to start/writte an UDF to make that possible?

Thanks a lot.

Laura

There is a text interface command

report/species-mass-flow

You could use this in a journal file and post-process the transcript file.

Hi thanks for the answer.

I tried to use the text interface command but I couldn't find how to specifie each cell of the outlet and report it's mass fraction for each time step?

can't we do that with an UDF?

Thanks a lot for the help.

Laura

Yes, you can use a UDF...

DEFINE_ON_DEMAND(species_mass_flow) { Domain *domain = Get_Domain(1); Thread *t; face_t f; thread_loop_f(t,domain)

if( THREAD_TYPE(t)==THREAD_F_POUTLET )

begin_f_loop (f,t)

{

int species_index = 0;

real smf = F_FLUX(f,t)*F_YI(f,t);

Message("%i %e\n",f,smf);

}

end_f_loop (f,t) }

Thanks a lot my friend.

Best regards.