[Ahmed kandil]

Hello every one ...
My udf code which i prepared it to calculate inlet temp based on outlet temp always give me intial temp of inlet condition 4.7 k but i need it 288.15 k
so what is the problem ?
This My code ..
#include "udf.h"

#define Q 5600
#define m 0.283
#define Cp 4200
#define stop_time 252000

real ave_T;

DEFINE_ADJUST(temp_ave, domain)
{
int ID = 16;
int i=0;

real total_temp = 0;
real T;

Thread *thread = Lookup_Thread(domain, ID);
face_t face;

begin_f_loop(face, thread)
{
T = F_T(face, thread);
total_temp = total_temp + T;
i = i + 1;
}
end_f_loop(face, thread)

ave_T = total_temp / i ;

printf("outlet average of temp : %f\n" , ave_T);
}

DEFINE_PROFILE(Temp_inlet,t,i)
{
face_t f;

real current_time;
current_time=CURRENT_TIME;

if (current_time < stop_time)
{
begin_f_loop(f,t)
{
F_PROFILE(f,t,i)= (Q/(m*Cp)) + ave_T;
}
end_f_loop(f,t)
}
else
{
begin_f_loop(f,t)
{
F_PROFILE(f,t,i)= 288.15;
}
end_f_loop(f,t)
}
}

[pakk]

What is the reported outlet temperature?

[Ahmed kandil]

There are no outlet temp at starting this is logic as there are no flow occur yet but in report file at Tin=4.7 k , Tout=288.15 k...
I think Tin =4.7K get from heat equation at I=0...

[pakk]

Your answer is unclear. Let me ask in a different way.

Your code contains the following line:

printf("outlet average of temp : %f\n" , ave_T);

What does this line give as output? Do you see it showing up in your console?

[Ahmed kandil]

Yes I see it and it give me average outlet temp

[pakk]

Yes, I know that. My question is what it is showing. I can not see your screen...

I guess that it shows 288.15, but it would really be helpful if you can just confirm that, so I don't have to guess...

Exactly what do you see on your screen? Copy the text, make a screenshot, just be clear and don't let us guess...

[AlexanderZ]

you code is valid for single core computation only

[Ahmed kandil]

I don’t understand what you mean

[Ahmed kandil]

I will clear this code ..
I want from this code to do process called thermal response test For geothermal heat pump this process use water as a fluid there are initial value for inlet temp which is equal =288.15 K this fluid with this temp passes through earth and then cooled and exit from pipe with temp = Tout and then I calculate Tin again from heating equation and fluid inlet again to earth (value of Tin will be more accurate ) and so on ....
When I interpret this UDF code and click on initialization and choose inlet condition I found Tin 4.7 k and the solution start from this point this will take more iteration to get correct value of Tin ....