[landa]

Hi
i want to define solar radiation as a heat flux BC for my problem. i have its average quantity per month (in w/m^2) for a year and i want to define it for fluent. i think i should use define_profile but i'm not good at prgramming especialy in c and also i'm newbie in defining udf.
can someone please kindly share a sample udf program for me?
thanks in advance

[syavash]

Originally Posted by landa

Hi
i want to define solar radiation as a heat flux BC for my problem. i have its average quantity per month (in w/m^2) for a year and i want to define it for fluent. i think i should use define_profile but i'm not good at prgramming especialy in c and also i'm newbie in defining udf.
can someone please kindly share a sample udf program for me?
thanks in advance

Hi landa,

You may reffere to Fluent UDF manual. There are some good examples on Define_profile in there. You just need to copy one of thouse and pase it in a C file. Then you can change the F_profile value depending on your need. It's so simple, Just take a look and make it!
Good luck

[landa]

i did so. can u please kindly take a look at it to see whether it has any problem.
this program includes heat flux for 3 days

#include"udf.h"
DEFINE_PROFILE(flux,th,i)
{
face_t f;
begin_f_loop(f,th)
{
if(CURRENT_TIME <= 86400.0 )
F_PROFILE(f,th,i) = 300.0;
elseif(CURRENT_TIME <= 172800.0 && CURRENT_TIME > 86400.0 )
F_PROFILE(f,th,i) = 310 ;
elseif(CURRENT_TIME <= 259200.0 && CURRENT_TIME > 172800.0 )
F_PROFILE(f,th,i) = 320 ;
else (CURRENT_TIME <= 345600.0 && CURRENT_TIME > 259200.0 )
F_PROFILE(f,th,i) = 330 ;
}
end_f_loop(f,th);
}