Hi:

I met a problem in calculating the airflow pass the building. The inlet velocity varies with the height from the groud. It is not a constant. How can I cope with this problem?

Thanks John

Hi! You can find a good example with explanations in Fluent UDF domentation. You should write UDF which looks something like this (with other velocity function):

include "udf.h"

DEFINE_PROFILE(inlet_x_velocity, thread, position) { real x[ND_ND]; /* this will hold the position vector */ real y; face_t f;

begin_f_loop(f, thread)

{

F_CENTROID(x,f,thread);

y = x[1];

F_PROFILE(f, thread, position) = 20. - y*y/(.0745*.0745)*20.;

} end_f_loop(f, thread) }

GOOD LUCK MATEUS