[hadiCFD]

Hi guys

I would like to define a 3D velocity profile but I don't know how. I read lots of 2D examples, but I am still confused about 3D. Is there any one who can help me?
It is one of the samples for 2D How can I add the third dimension to this code?

The desired velocity is
Vz = (1-(x^2+y^2)/25)

#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)
}