CFD Online Discussion Forums - Drawing a velocity profile as inlet boundary condition in Fluent ANSYS ????

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Drawing a velocity profile as inlet boundary condition in Fluent ANSYS ????

I have a velocity profile equation which I want to give as inlet boundary condition in ANSYS Fluent. How this is possible.??? :confused: Please guide me step wise. Comments are really appreciated :)

Hi..
You have to use UDF for defining velocity profile at inlet.

Code:

/**********************************************************************    udfexample.c                                                              UDF for specifying a steady-state velocity profile boundary  condition    **********************************************************************/   #include "udf.h"  /* must be at the beginning of every UDF you write */ 

  DEFINE_PROFILE(x_velocity,thread,index) {   

real x[ND_ND];        /*  this will hold the position vector */ 

  real y; 

  face_t f;     

begin_f_loop(f,thread)  /* loops over all faces in the thread passed                                 in the DEFINE macro argument  */ 

    {        F_CENTROID(x,f,thread);       y = x[1];       F_PROFILE(f,thread,index)  = 20. - y*y/(.0745*.0745)*20.;     }   end_f_loop(f,thread) }

You may refer
http://aerojet.engr.ucdavis.edu/flue...df/node224.htm

Thank you Maverick.. your post is very helpful. I will try doing that