CFD Online Discussion Forums - Udf: Define_grid

Hi,
I'm trying to use the define_grid_motion macro. I want to update the mesh every time steps with my file txt but during the simulation my nodal coordinates don't update as the udf isn't reading the file.

this is my UDF

Code:

#include "udf.h"

#include "stdlib.h"

#include "stdio.h"

#include<string.h>

#include "dynamesh_tools.h"

DEFINE_GRID_MOTION(remesh,domain,dt,time,dtime)

{

        FILE *fd;        

        Thread *tf = DT_THREAD(dt);

        face_t f;

        Node *v;          

        real NV_VEC(vetcoord);

        int n,i,time_step;

        char nomefile[14]=“nodi_”, numero_file[5], estensione_file[5]=".txt";

  

        time_step=N_TIME+1;

        Message("time_step:%d\n", time_step);

  

        sprintf(numero_file, "%d", time_step);

        strcat(nomefile, numero_file);

        strcat(nomefile, estensione_file);

        fd=fopen(nomefile, "r");

  

        i=0;

    if( fd==NULL ) 

        {

    perror("Errore in apertura del file");

    exit(1);

        }

        

        SET_DEFORMING_THREAD_FLAG(THREAD_T0(tf));





        begin_f_loop(f,tf)         

        {

                f_node_loop(f,tf,n)

             {                        

                         v = F_NODE(f,tf,n);

                                                

            if (NODE_POS_NEED_UPDATE (v))

            {

                            NODE_POS_UPDATED(v);

                                fscanf(fd, "%g %g %g", &vetcoord[0], &vetcoord[1], &vetcoord[2]);                                

                                NV_V(NODE_COORD(v), +=, vetcoord);

                                i++;

                                /*Message("coordinate:ID: %d %g %g %g \n",i,NODE_X(v), NODE_Z(v), NODE_Y(v));  */             

                        }



                }

        }

        end_f_loop(f,tf);        



        fclose(fd);

}

and my file is a txt file written in matlab with dlmwrite with tab as delimiter. I didn't write nodes ids.
thank you