UDF for Continuous Step Velocity Profile
 

Hi.
I want to apply a continuous step velocity profile for my inlet.
I want it to keep fluctuating with period of 0.04 seconds until I stop iteration.
Would you please let me know how to do it and whether the way I have written that is correct.

Here is my UDF.


#include "udf.h"
DEFINE_PROFILE(Step_UDF,thread,position)
{
real x[ND_ND];
face_t f;
real u,u0=0.4;
real t;
begin_f_loop(f,thread)
{
F_CENTROID(x,f,thread);
t = RP_Get_Real("flow-time");
if ((fabs(t/0.04)%2)==0)
u=u0;
else
u=u0*1.03;
F_PROFILE(f,thread,position)=u;
}
end_f_loop(f,thread)
}

Since you already have a proposed solution:
-did you try it?
-did it do what you wanted it to do?
-if not, what was wrong?

Well I tried and found that I have to mention before that both sides of % are integer.
I just found it through trial and error.
I was actually hoping that someone give me a general solution.
What I did is working for me now.

Thank you :)