[ChristophGradl]

Hello,
I want to use a monitor in fluent to plot the value of a variable of a UDF.
Is there a possibility in fluent?
I only found the possibility to write the values to a file.

For example I want to monitor the variable v_prev:

     DEFINE_CG_MOTION(piston, dt, vel, omega, time, dtime)  {      
 Thread *t;      
 face_t f;      
 real NV_VEC (A);      
 real force, dv;      
 /* reset velocities */      
 NV_S (vel, =, 0.0);      
 NV_S (omega, =, 0.0);      
 if (!Data_Valid_P ())      
 return;
      /* get the thread pointer for which this motion is defined */
       t = DT_THREAD ((Dynamic_Thread *)dt);      
 /* compute pressure force on body by looping through all faces */      
 force = 0.0;      begin_f_loop (f, t)
       {
           F_AREA (A, f, t);          
          force += F_P (f, t) * NV_MAG (A);      
       }
      end_f_loop (f, t)
         /* compute change in velocity, i.e., dv= F * dt/ mass;         velocity update using explicit eulerformula */
      dv= dtime* force / 50.0;
       v_prev+= dv;
         CX_Message ("time = %f, x_vel= %f, force = %f\n", time, v_prev, force);
      /* set x-component of velocity */
       vel[0] = v_prev;  
 }

Thank you for any suggestions,
Christoph