[F. Lang]

Hello everyone,
I am trying to define a UDF to ramp up an inlet velocity for a steady simulation after a set amount of iterations.
However I am getting a parse error when trying to access the iteration number via nres:

 int current_iter = (nres == 0) ? (0) : ((int) count2[nres - 1]);

ERROR ./AppData/Local/Temp/udf-veloRamp.c.6332.0.c: line 18: parse error
ERROR ./AppData/Local/Temp/udf-veloRamp.c.14000.1.c: line 18: parse error
ERROR ./AppData/Local/Temp/udf-veloRamp.c.14368.2.c: line 18: parse error
ERROR ./AppData/Local/Temp/udf-veloRamp.c.21128.3.c: line 18: parse error
ERROR ./AppData/Local/Temp/udf-veloRamp.c.17820.4.c: line 18: parse error
ERROR ./AppData/Local/Temp/udf-veloRamp.c.10796.5.c: line 18: parse error
ERROR ./AppData/Local/Temp/udf-veloRamp.c.13712.6.c: line 18: parse error
ERROR ./AppData/Local/Temp/udf-veloRamp.c.9300.7.c: line 18: parse error

What is my mistake? Is there a better way to get the iteration number?

Thanks





Full UDF-code below:

  /******************************************************************
  UDF for specifying ramping velocity profile BC
  *******************************************************************/
  
  #include "udf.h"
  DEFINE_PROFILE(velocity_magnitude, t, i)
  {
          real start_velocity,end_velocity;
          int ramp_start,ramp_end;
          real line_slope,line_intercept;       
          face_t f;
  
          start_velocity=0.0;            // starting & end velocity [m/s] 
          end_velocity=10.0;
          ramp_start=10;                 // ramp start & end timestep [-]
          ramp_end=1000;
  
          int current_iter = (nres == 0) ? (0) : ((int) count2[nres - 1]);      // current iteration
  
          line_slope = (end_velocity-start_velocity)/(ramp_end-ramp_start);
          line_intercept = start_velocity-line_slope*ramp_start;
  
          begin_f_loop(f,t)
                 {
                         if (current_iter<ramp_start)                                                                               // velocity before ramp [m/s]
                         {
                                 F_PROFILE(f,t,i) = 0.0;
                         }
                         else if (current_iter>=ramp_start && current_iter<=ramp_end)                // ramping velocity
                         {
                                 F_PROFILE(f,t,i) = line_slope*current_iter+line_intercept;
                         }
                         else
                         {
                                 F_PROFILE(f,t,i) = end_velocity;
                         }
                 }
          end_f_loop(f,t)
  }

[hasnaaoub]

I am doing a CFD study on an electric car.
Currently, I am in the setup phase. I tried to integrate solar radiation using a function in the "User Defined" interface with C code. I tried to use the "Interpreted" extension, but I still encounter an error. When I try to use the "Compiled" extension, another error occurs.

Can you send me an example of a udf function that you have already used in your studies and that can be used in ansys?

Thank you in advance for your he