[swadejaxsun]

I'm new to FLUENT and creating UDFs, but I'm trying to setup a 2D problem where the velocity on the inlet varies with x-position. I have the velocity and x-position data I need, but I'm not sure how to utilize that in FLUENT using a UDF. Most of the functions I've seen are functions of time. Even then I'm not sure I need a true function, as all I really want it to do is: at x=## on the inlet edge use this velocity, at x=### on the inlet edge use that velocity.

What's the best way to go about this?

I got the data from a 3D model I have in FLUENT so I have more than just velocities and x-position data if I need to grab more or different data.

Thanks.

[LuckyTran]

This could just as easily be done using a boundary PROFILE.


In the Fluent customization manual (in the help) you can find likes of examples. For example here is one for making a pressure profile.

 #include "udf.h"
 
 DEFINE_PROFILE(pressure_profile,t,i)
 {
    real x[ND_ND];    /* this will hold the position vector */
    real y;
    face_t f;
    begin_f_loop(f,t)
      {
       F_CENTROID(x,f,t);
       y = x[1];
       F_PROFILE(f,t,i) = 1.1e5 - y*y/(.0745*.0745)*0.1e5;
      }
    end_f_loop(f,t)
  }

Use x[0] for x-coordinate and x[2] for z-coordinate. And update the line F_PROFILE(f,t,i) = 1.1e5 - y*y/(.0745*.0745)*0.1e5;