[swapnil13]

We are using udf for paraboloid velocity profile at inlet as attached . We have calculated the velocity profile using the centroid data and same formula used in udf in excel and got the desired profile in excel.
But we are not getting the profile in fluent after solving.
udf and plot from fluent is attached.

please help....

[AlexanderZ]

/***********************************************************************
vprofile.c
UDF for specifying steady-state velocity profile boundary condition
************************************************************************/

#include "udf.h"
#include "math.h"

DEFINE_PROFILE(inlet_x_velocity, thread, position)
{
  real x[ND_ND]; /* this will hold the position vector */
  real  R,v_max,a,y,z;
  face_t f;
  R = 0.02; /* inlet radius in m */
  v_max=0.1;

  begin_f_loop(f,thread)
  {
    F_CENTROID(x, f, thread);
	y=x[1];
	z=x[2];
    a=-v_max/pow(R,2);
    F_PROFILE(f, thread, position) = a*(z*z + y*y) + v_max;
  }
  end_f_loop(f, thread)
}

best regards

[swapnil13]

thank you very much....it is now working as desired.