[Martin_Sz]

Hello
Can Anyone help me to make udf file to export average temperature on outlet from previous step to inlet in next step - transient simulation
Best regards

[Martin_Sz]

can anyone help ??/

[AlexanderZ]

show the code you have, explain problems with it, compilation log, domain geometry, do your boundaries have the same mesh or not

[Martin_Sz]

So in the attachment U have schematic of my model with boundary conditions
I need to make recirculating gas over two gas domains and one porous , so that i need a average temeprature from outlet (domain 2 - previous step) to import on inlet to next step (domain 1 gas).
Mesh is different on outlet and inlet - different areas .

[AlexanderZ]

you should define initial temperature, which will be applied (tavg = 300 K in code)
at define correct ID number for the outlet boundary from your model (you can find it in fluent GUI)
compile code

#include "udf.h"
real tavg = 300.;
int outlet_id = 11;

DEFINE_EXECUTE_AT_END(get_outlet_t)
{
Domain *d; /* declare domain pointer since it is not passed as an
argument to the DEFINE macro */

real temp,volume,vol_tot;
Thread *t;
cell_t c;

d = Get_Domain(1); /* Get the domain using ANSYS Fluent utility */
/* Loop over all cell threads in the domain */
t = Lookup_Thread (d, outlet_id);
tavg = 0.;
/* Loop over all cells */
begin_c_loop(c,t)
{
volume = C_VOLUME(c,t); /* get cell volume */
temp = C_T(c,t); /* get cell temperature */
vol_tot += volume;
tavg += temp*volume;
}
end_c_loop(c,t)
#if RP_NODE
vol_tot = PRF_GRSUM1(vol_tot);
tavg = PRF_GRSUM1(tavg);
#endif
tavg /= vol_tot;
Message0("\n Tavg = %f\n",tavg);
/* Compute temperature function and store in user-defined memory*/
/*(location index 0) */
}

DEFINE_PROFILE(inlet_temperature, t, position)
{
face_t f;
begin_f_loop(f,t)
{
F_PROFILE(f, t, position) = tavg;
}
end_f_loop(f, t)
}