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#include "udf.h"
#define a 0.22
#define Uref 5
#define Zref 0.5
DEFINE_PROFILE(x_velocity,thread,position)
{
  real z,u,x[ND_ND];
  face_t f;
  begin_f_loop(f,thread)
  {
   F_CENTROID(x,f,thread);
   z=x[1];
   u=Uref*pow(z/Zref,a);
   F_PROFILE(f,thread,position)=u;
   }
   end_f_loop(f,thread)
}
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