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#include "udf.h"
DEFINE_DPM_BC(usr_bc_reflect,p,t,f,f_normal,dim)
{
        real cos_angle,angle;
        cos_angle=NV_DOT(f_normal,P_VEL(p))/MAX(NV_MAG(P_VEL(p)),DPM_SMALL);
        cos_angle=MIN(1.0,MAX(-1.0,cos_angle));
        angle=90.0-acos(cos_angle)/M_PI*180.0;
        Message0("particle id=%d,angle between particle velocity and wall face=%f degree\n",p->part_id,angle);
        Reflect_Particle(p,f_normal,dim,f,t,t,f);  //if "trap" condition, then use "Trap_Particle(p);"
        return PATH_ACTIVE; // if "trap" condition, then use "return PATH_END;"
}
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fengwa

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