CFD Online Discussion Forums - Fluent UDF for calculate boundary zone centroid and the mass flow

Hi All,
My geometry consist of >600 boundary surfaces (>30 fluid zones) and I want fluent to extract each boundary centroid so that I can use this information for post-processing.

Code:

#include "udf.h"



FILE *fout;



void Print_Thread_Face_Centroids(Domain *domain, int id)

{

    real FC[3];

    face_t f;

    int n_faces,j;

    Thread *t = Lookup_Thread(domain, id);

    

    n_faces=THREAD_N_ELEMENTS_INT(t);

    fprintf(fout,"%d\n", n_faces); /* prints number of cell faces */

    begin_f_loop(f,t)

        {

                F_CENTROID(FC,f,t);

                fprintf(fout, "f%d %g %g %g\n", f, FC[0], FC[1], FC[2]);

        }

    end_f_loop(f,t)

    fprintf(fout, "\n");

}



DEFINE_ON_DEMAND(get_coord)

{

    Domain *domain; /* domain is declared as a variable */

    domain = Get_Domain(1); /* returns fluid domain pointer */

    fout = fopen("BCData.txt", "w");

    Print_Thread_Face_Centroids(domain, 16);

    fclose(fout);

}

I was able to interpret and run the above code, it is writing face centroid of each element on the boundary but I want the centroid of the boundary or else the min and max values in X and Y direction.

Please help me in resolving this issue.