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Outlet temperature to temperature boundary condition of velocity inlet. (UDF)

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Old   March 22, 2018, 07:32
Default Outlet temperature to temperature boundary condition of velocity inlet. (UDF)
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dongsu park
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Good day Guys.

I have a big problem to give temperature condition in inlet condition.

Simulation is like under.

there is a pipe in sea water. and initial temperature condition of sea water is 277.15K and pipe and fluid are 343.15K.

I want to give outlet temperature to inlet temperature.

like that

time step 1 of outlet temperature to time step 2 of inlet temperature
and

time step 2 of outlet temperature to time step 3 of inlet temperature.

I'm not familiar with c++ code and i think i couldn't make this for myself.

this is code i found and revised....


#include "udf.h"

#define get_temp_zone_ID 26

real Abstemperature =343.15;

DEFINE_ADJUST(find_Abstemperature,domain)
{
#if !RP_HOST
Thread *ft,*ct;
face_t f;
cell_t c;
/* int ID = 26; */

Abstemperature =343.15;

ft = Lookup_Thread(doamin,get_temp_zone_ID);
ct = THREAD_T0(ft);

Abstemperature =343.15;

begin_f_loop(f,ft)
{
c = F_C0(f,ft);
if(Abstemperature > C_T(c,ct))
Abstemperature = C_T(c,ct);

}
end_f_loop(f,ft)
#endif
}

DEFINE_PROFILE(Abstemperature, t, enq)
{
face_t f;

begin_f_loop(f, t)
{
F_PROFILE(f, t, enq) = Abstemperature;
}

end_f_loop(f, t)
}

If anyone professional in UDF..

Please help me

Sincerely Dillon.
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Old   March 24, 2018, 01:36
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Doruk Yelkenci
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You cant carry variables between 2 different macros. Just use define profile.
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Old   March 24, 2018, 22:51
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dongsu park
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Quote:
Originally Posted by doruk View Post
You cant carry variables between 2 different macros. Just use define profile.
Thank you for reply doruk.

as you say. I make code using only difine profile like this

#include "udf.h"

DEFINE_PROFILE(temp_in,thread,i)
{

Domain *d;

real temp_in;
int ID_outlet=26;

face_t f;
Thread *t;
d = Get_Domain(14);

t= Lookup_Thread(d, ID_outlet);

begin_f_loop(f,thread)
{
temp_in = F_T(f,t);

F_PROFILE(f, thread, i) = temp_in;

}
end_f_loop(f,thread)

}


...but it cant work..

when i click 'Initialize' error pops up

massage is "MPI Application rank 0 exited before MPI_Finalize() with status 2
The fl process could not be started."

what should i d?
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Old   March 25, 2018, 11:06
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Doruk Yelkenci
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check your threads. You have defined t= Lookup_Thread(d, ID_outlet) but for the loop you are using begin_f_loop(f,thread).

Change it to begin_f_loop(f,t)

Hope it works now
Best Regards
Doruk
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