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UDF2:

#include "udf.h"  

DEFINE_ON_DEMAND(on_demand_calc)
{
   Domain *subdomain;
   /* declare domain pointer since it is not passed as an argument to the DEFINE macro  */
   Thread *cell_thread;
   cell_t cell;
   float a1,a2,x[2];
   subdomain=Get_Domain(2);   /* returns phase with ID=2 domain pointer£¬meanning primary phase*/
   /* Loop over all cell threads in the domain */
   thread_loop_c(cell_thread,subdomain)
   {
     /* Loop over all cells  */
     begin_c_loop(cell,cell_thread)
       {
        C_UDSI(cell,cell_thread,0)=C_VOF(cell,cell_thread);
                }
     end_c_loop(cell,cell_thread)
         begin_c_loop(cell,cell_thread)
       {
        C_CENTROID(x,cell,cell_thread);
                C_UDMI(cell,cell_thread,0)=NV_MAG(C_UDSI_G(cell,cell_thread,0));
                a1=C_VOF(cell,cell_thread);
                a2=C_UDMI(cell,cell_thread,0);
                printf("location:%f,%f,vof:%f,gradient:%f\n",x[0],x[1],a1,a2);      
       }
     end_c_loop(cell,cell_thread)
    }
}

      
UDF3£º
#include "udf.h"
DEFINE_ON_DEMAND(grad)
{
  Domain *mixture_domain, *sub_domain;
  Thread *cell_thread;
  cell_t cell;
  int phase_domain_index;
  float a1,a2,x[2];
  mixture_domain=Get_Domain(1);
  
   sub_domain_loop(sub_domain,mixture_domain,phase_domain_index)
  {
     /* loop if primary phase  */
    /* if (DOMAIN_ID(sub_domain) == 2)     */  

     /* loop over all cell threads in the primary phase domain  */
     thread_loop_c(cell_thread,sub_domain)
     {
         /* loop over all cells in primary phase cell threads  */
         begin_c_loop_all(cell,cell_thread)
         {
          C_CENTROID(x,cell,cell_thread);
                  C_UDSI(cell,cell_thread,0)=C_VOF(cell,cell_thread);
                  C_UDMI(cell,cell_thread,0)=NV_MAG(C_UDSI_G(cell,cell_thread,0));
                  a1=C_VOF(cell,cell_thread);
                  a2=C_UDMI(cell,cell_thread,0);
                  printf("location:%f,%f,vof:%f,gradient:%f\n",x[0],x[1],a1,a2);            
         }
         end_c_loop_all(cell,cell_thread)
     }

   }
}
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