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UDF to modify inlet fluid temperature

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Old   February 22, 2016, 22:11
Question UDF to modify inlet fluid temperature
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Vipul Patel
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Dear all,
In my simulation, I want to modify my inlet boundary condition according to the temperature obtained at the outlet boundary.
Inlet temperature = Outlet temperature - 5.0
I am trying to write a UDF for this purpose. I am able to compile the UDF but I am not able to assign it to the inlet boundary. When I am trying to assign it to the inlet boundary, fluent automatically terminates.

My UDF is as follows:


#include "udf.h"
real Tout[100];
FILE *fid;
FILE *fid1;

DEFINE_ADJUST(Out_temp, domain)
{
face_t f;
int i=1;
int ID = 6;
Thread *thread = Lookup_Thread(domain, ID);
fid=fopen("T_out", "w");

begin_f_loop(f, thread)
{
Tout[i]=C_T(f,thread);
}

fprintf(fid,"%f\n", Tout[i]);
i++;

end_f_loop(f,thread)
fclose(fid);
}

DEFINE_PROFILE(Inlet_Temp, thread6, position)
{
face_t f;
cell_t c;
int i,j;
i=1;

fid1=fopen("T_in", "w");

begin_f_loop(f,thread6)
{
F_PROFILE(f,thread6,position)=Tout[i]-5.0;
fscanf(fid,"\n");
fprintf(fid1, "%f\n", Tout[i]-5.0);
i=i+1;
}

end_f_loop(f,thread6);
fclose(fid1);
fclose(fid);
}


Please let me know if the present methodology is correct or not. Is it possible to update the inlet boundary temperature according to the outlet boundary temperature by any other means??

Thanks,
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