CFD Online Discussion Forums - DEFINE_GRID_MOTION crash without any info??

This is my code to run DEFINE_GRID_MOTION. However, it crashed whenever I run "dynamic mesh preview" more than 1 time step. If I run 1 step each time I restart fluent, it works.

Maybe it is because of the stack pointer I add. But I've already free it after use. Would you please help me out?

Note: The pointer value is used to receive a udf loadinterp and it works well (I checked that inside Fluent).

BTW, how to use Macro to compile UDF step by step?

Thanks a lot!:)

Code:



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

{

 

  Thread *tf = DT_THREAD (dt);

  face_t f;

  Node *v;

  float *value= (float *)malloc(3*sizeof(float));



  float NV_VEC (dx);

  int n;

  

  char str [ FILENAME_MAX ];

  sprintf_s(str,FILENAME_MAX, "c:\\BoundGrid_%d.txt", N_TIME+1);



  

  // set deforming flag on adjacent cell zone

  SET_DEFORMING_THREAD_FLAG (THREAD_T0 (tf));



  Message ("time = %f %d\n", time,N_TIME);

  

  

  

  begin_f_loop (f, tf)

    {

      f_node_loop (f, tf, n)

        {

          v = F_NODE (f, tf, n);



          // update node if x position is greater than 0.02

          // and that the current node has not been previously

          // visited when looping through previous faces

          if (NODE_POS_NEED_UPDATE (v))

            {

              // indicate that node position has been update

              // so that it's not updated more than once 

              NODE_POS_UPDATED (v);





              value = loadinterp(str, NODE_COORD (v)[0], NODE_COORD          (v)[1],NODE_COORD (v)[2]);



              NV_DS (dx, =, *value,*(value+1),*(value+2),*,dtime);

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

            }

        }

    }



  end_f_loop (f, tf);



  free(value);



}