[sylvix48]

Hello everyone !

In my problem I have a cylindrical geometry with an inlet and an outlet with a mixture inside and I want to determinate the molar flow rate in the inlet and the outlet. The formula to calculate the molar flow rate is :



Where C is the concentration of the specie, V the velocity of the flow and S the surface

The Inlet ID is 23, the outlet is 24 and my mixture ID is 15.

I've tried to code it but I've several issues :

Here's my UDF for my inlet case:

#include "udf.h"

DEFINE_EXECUTE_AT_END(measure_molar_flow_rate_inl)
{
Domain *d;
real molar_flow_rate_inl=0.;
face_t f;
Thread *t;
d = Get_Domain(15);
t= Lookup_Thread(d, 24);

begin_f_loop(f,t)
{
molar_flow_rate_inl+=NV_MAG(A)*F_W(f,t)*"Concentra tion";

/* How to define the face concentration of a specific specie when my mixture contains several species and how I can define A in NV_MAG(A) ???*/


}
end_f_loop(f,t)
}
printf("Molecular Flow Rate inlet: %g\n",molar_flow_rate_inl);

Thank you for your future answers !!!