[Ionatan]

I want to simulate the dispersion of decomposing tracer gas in a cold storage chamber. The problem arises in modeling this air recycling, which must have conservation of the tracer gas. I don't need to model and simulate the recycling region. I just want all the tracer gas that goes out through the outlet to come back to the diffusers. Below are some images from the geometry, the yellow box is the recycling region that I want to eliminate. I found on an old thread (Coupling outlet to inlet) a UDF that did this coupling, but for the air humidity. if anyone could help me translate it to a generic tracer gas, I would appreciate it, being reading the UDF manual for some time, and didn't get far.




#include "udf.h"
#define OUTLET_ID 11

DEFINE_PROFILE(set_humidity_inlet,inlet_thread,var iable_index)
{
face_t inlet_face_index, outlet_face_index;
real water_mass_fraction=0;
real n = 0.;
real H_AVG = 0.;
Thread *outlet_thread;
Domain *domain;

domain=Get_Domain(1);
outlet_thread=Lookup_Thread(domain,OUTLET_ID);

begin_f_loop(outlet_face_index,outlet_thread)
{
water_mass_fraction = water_mass_fraction + F_YI(outlet_face_index,outlet_thread,variable_inde x);
n = n + 1;
}
end_f_loop(outlet_face_index,outlet_thread)

H_AVG = water_mass_fraction/n;

begin_f_loop(inlet_face_index,inlet_thread)
{
F_PROFILE(inlet_face_index,inlet_thread,variable_i ndex)=H_AVG;
}
end_f_loop(inlet_face_index,inlet_thread)
}