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#include "udf.h"
DEFINE_DPM_BC(my_dpm_bc,p,t,f,f_nomal,dim)
{
        real vn=0.;
        real alpha;
        real vc;
        real vn1;
        real nor_coeff=0.8;
        real tan_coeff=0.3;
        real nomal[3];
        real diam;
        real NV_VEC(x);
        diam=P_DIAM(p);
        int i,idim=dim;
        for(i=0;i<idim;i++)
                nomal=f_nomal;
        for(i=0;i<idim;i++)
            vn+=p->state.V*nomal;
                vn1=fabs(vn);
                vc=pow((2*0.00000018/diam/45.3/45.3*pow((45.3+pow(vn1,0.718)),2)),1.43);
        if(vn1<vc)
        {
        return PATH_ABORT;
        }
        else
        if(p->type==DPM_TYPE_INERT)
        {
                alpha=M_PI/2.-acos(MAX(-1.,MIN(1.,NV_DOT(nomal,p->state.V)/
                             MAX(NV_MAG(p->state.V),DPM_SMALL))));
        if((NNULLP(t))&&(THREAD_TYPE(t)==THREAD_F_WALL))
        F_CENTROID(x,f,t);
        for(i=0;i<idim;i++)
           p->state.V-=vn*nomal;
        for(i=0;i<idim;i++)
           p->state.V*=tan_coeff;
        for(i=0;i<idim;i++)
           p->state.V-=nor_coeff*vn*nomal;
        for(i=0;i<idim;i++)
           p->state0.V= p->state.V;
        return PATH_ACTIVE;
        }
}
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