[thinktank]

This is an udf file used in the VOF tutorial..

#include "udf.h"
#include "sg.h"
#include "sg_mphase.h"
#include "flow.h"

#define PI 3.141592654


DEFINE_PROFILE(membrane_speed,        /* function name   */
               th    ,                /* thread          */
               nv)                    /* variable number */
{
  face_t f;
  real x[ND_ND];
  real f_time = RP_Get_Real("flow-time");

  begin_f_loop (f,th)
    {
      F_CENTROID(x,f,th);
      if (f_time<=10e-6)
      {F_PROFILE(f,th,nv) = 3.58*cos(PI*f_time/30e-6);
      }
      else
      F_PROFILE(f,th,nv) = 0;
    }
  end_f_loop (f,th)
}

I was just wondering if we actually need all the definitions used i.e. #include "sg.h"
#include "sg_mphase.h" and
#include "flow.h"
Isnt "udf.h" enought for the above code.

Also do we need to evaluate F_CENTROID(x,f,th) in this case?