udf -pulsatile flow
 

I want to change constant inlet velocity to sinusoidal
(asinwt) velocity which will vary with time. Can anybody send the udf file for the same for which I shall be obliged to you.

Try this one:

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)= 2000.+ 100*t;
}
end_f_loop(f,thread)
}


Courtesy: http://www.cfd-online.com/Forums/flu...n-one-udf.html