[hanis_iz]

Hello,
I'm using UDF in my simulation (3D case) to achieve actual velocity profile at the inlet (y-axis direction). The results of my simulation (velocity magnitude at the inlet) is as below:

normal08 lam1.jpg

The velocity magnitude that i'm supposed to get is:

inlet.PNG

The UDF file that I used is:

#include "udf.h"
#define Q 3.3e-5 //unit m3/sec
#define Diameter 4.9e-3 //unit m
DEFINE_PROFILE(inlet_y_velocity,t,i)
{
real y[ND_ND];
real r,Area;
face_t f;
Area=(M_PI/4.0)*pow(Diameter,2);
begin_f_loop(f,t)
{
F_CENTROID(y,f,t);
r=sqrt(pow(y[0],2)+pow(y[1],2));
F_PROFILE(f,t,i)=(2.0*Q/Area)*(1-pow(2.0*r/Diameter,2));
}
end_f_loop(f,t)
}

I'm very glad if someone could help me with my problem.
Thank you in advance.

[pakk]

Your inlet is in the XZ-plane, but your UDF is written for the XY-plane.