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UDF code:

#include"udf.h"
#define freq 0.84 //ƵÂÊ
#define ampl 0.175 //·ùÖµ
#define density 998.2 //Ë®ÃܶÈ
#define GRAVITY 9.81 //ÖØÁ¦¼ÓËÙ¶È
int id=14; //¶þάÆÊÃæµÄID

DEFINE_CG_MOTION(int_block_roll, dt, vel, omega, time, dtime)
{
        omega[2] = 2*M_PI*freq*ampl*cos(2*M_PI*freq*time);
}

DEFINE_EXECUTE_AT_END(exe_end)
{
        real x_cg[3],m_glob[3],f_glob[3],sita,time,m_plus;
        real x[ND_ND],A[ND_ND];
        FILE *fp;
        Domain *domain=Get_Domain(1);
        face_t f;
        Thread *tf=Lookup_Thread(domain,id);
        time = CURRENT_TIME;
        x_cg[0] = 0.0;
        x_cg[1] = 0.0;
        m_plus=0.0;
        sita = ampl*sin(2*M_PI*freq*time);
        if(!Data_Valid_P())
                return;
        Compute_Force_And_Moment(domain,tf,x_cg,f_glob,m_glob,TRUE);
        begin_f_loop(f,tf)
{
        F_CENTROID(x,f,tf);
        F_AREA(A,f,tf);
        if(x[1]<0.0)
                m_plus+=density*GRAVITY*x[1]*fabs(x[1]*A[0]-x[0]*A[1]);
}
    end_f_loop(f,tf)
        m_glob[2]+=m_plus;

        #if !RP_NODE
        fp=fopen("roll.txt","a";
        fprintf(fp,"%f,%f,%f,%f,%f,%f
",time,sita,f_glob[0],f_glob[1],NV_MAG(f_glob),m_glob[2]);
        fclose(fp);
        #endif
}
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