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#include "udf.h"
#include "dpm.h"
#include "surf.h"
#define F1 0.000000000000048
#define TSTART 0.001
DEFINE_DPM_BODY_FORCE(particle_body_force, p, i)
{
   real bforce;
   real acc;
   cell_t c=RP_CELL(&p->cCell);
   Thread *t=RP_THREAD(&p->cCell);
   if(P_TIME(p)>TSTART)
   {
            if(i==1) acc=0;      
            else if(i==0)
                        {
             if (P_RHO(p)>0.5)
                        {
                    if (P_T(p)<480) acc=0;
            else if (P_T(p)>480) bforce=F1;
                        acc=bforce/P_MASS(p);
                                }
                        else if (P_RHO(p)<0.5) acc=0;
                        }
                        }
    else
    acc=0.0;
    return (acc);
}
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