Hi! This is my first time to use UDF. I want to define the inlet velocity as v=v0*sin(2*pi*f*t)in 3d tube. I read the fluent documentation (4.3.12 DEFINE_PROFILE). But the example is steady state. I confused how to add the time variable in my DEFINE_PROFILE macros.

Thanks in advance!!

How about something like that?

#include "udf.h"

DEFINE_PROFILE(unsteady_velocity, thread, position) { face_t f;

begin_f_loop(f, thread)

{

real t = RP_Get_Real("flow-time");

F_PROFILE(f, thread, position) = v0*sin(2*pi*f*t);

} end_f_loop(f, thread) }

Have fun MATEUS