[youhane]

Hi everybody,

Please help me to solve my problem,

I want to apply a convection boundary condition to a wall, but I want to put the free stream temperature as the real external temperature that I have in a notepad file like that:



left values are hours of the day, and right values are external temperatures.

Can anyone tell me how to do that please ??!

[AlexanderZ]

Originally Posted by youhane

Hi everybody,

Please help me to solve my problem,

I want to apply a convection boundary condition to a wall, but I want to put the free stream temperature as the real external temperature that I have in a notepad file like that:



left values are hours of the day, and right values are external temperatures.

Can anyone tell me how to do that please ??!

Hello

Most efficient for your case if UDF function.
Read ANSYS Fluent Customization Manual
Find there 2.3.22.DEFINE_PROFILE function. You need it

#include "udf.h"
DEFINE_PROFILE(free_stream_temp,t,i)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
real time;
face_t f;

time = CURRENT_TIME;  // fluent macro to get global flow time
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
F_PROFILE(f,t,i) = ***PUT HERE YOUR TIME DEPENDENT FUNCTION***;
}
end_f_loop(f,t)
}

Convert your table into time-dependent function in excel for example.

Compile this function. If you do not know how read https://www.cfd-online.com/Wiki/Fluent_FAQ

If you have no option except table read how to interpolate variables from table 3D heat source term profile

Best regards

[youhane]

Originally Posted by AlexanderZ

Hello

Most efficient for your case if UDF function.
Read ANSYS Fluent Customization Manual
Find there 2.3.22.DEFINE_PROFILE function. You need it

#include "udf.h"
DEFINE_PROFILE(free_stream_temp,t,i)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
real time;
face_t f;

time = CURRENT_TIME;  // fluent macro to get global flow time
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
F_PROFILE(f,t,i) = ***PUT HERE YOUR TIME DEPENDENT FUNCTION***;
}
end_f_loop(f,t)
}

Convert your table into time-dependent function in excel for example.

Compile this function. If you do not know how read https://www.cfd-online.com/Wiki/Fluent_FAQ

If you have no option except table read how to interpolate variables from table 3D heat source term profile

Best regards

Thank you very much dear AlexanderZ

Your answer is extremely useful