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Error:  received a fatal signal (Segmentation fault).

Error:  received a fatal signal (Segmentation fault).
Error Object: #f

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#include"udf.h"

DEFINE_SOURCE(source_mass,cell,t,dS,eqn)

{
        real A[ND_ND];
        real source;
        real temp0,temp1,temp2;
        real vol;
        real vof;
        real a0[ND_ND],a1[ND_ND],a2[ND_ND];
        real diff;
        real xv[ND_ND],yv[ND_ND],zv[ND_ND];
        real x;   

        Domain *domain;
        Thread *c_thread;
        Thread *subthread;
        cell_t c;
        face_t f;
        Domain *d=Get_Domain(2);       //µÚÒ»Ïà¶ÔÓ¦µÄ×ÓÓò domain_id ÊÇ 2
        Thread *mixture_thread = THREAD_SUPER_THREAD(subthread);

        temp0=C_T_G(cell,c_thread)[0];
        temp1=C_T_G(cell,c_thread)[1];
        temp2=C_T_G(cell,c_thread)[2];
        vol=C_VOLUME(cell,c_thread);   //¿ØÖÆÌåÌå»ý£»
        vof=C_UDSI(cell,c_thread,0);      //¿ØÖÆÌåÄÚº¬ÊªÁ¿£»
        x=vof*12.53;
        diff=(7*(-2.41-0.002*pow(vof,-1.75))/0.0718)*(-1.425*pow(10,-4)-4.76*pow(10,-7)*C_T(c,t))*9.48*pow(10,x)/pow(10,10);       //µÈÎÂÀ©É¢ÏµÊý
        xv[0]=1;xv[1]=0;xv[2]=0;
        yv[0]=0;yv[1]=1;yv[2]=0;
        zv[0]=0;zv[1]=0;zv[2]=1;

        begin_f_loop(f,c_thread)  //Àú±é»ìºÏÏàµÄËùÓÐÃæ
        {
                F_AREA(A,f,c_thread);       //F_AREA¿ÉÒÔ±»ÓÃÓÚ·µ»ØÒ»¸öʵÊýµÄÃæ»ýÏòÁ¿
                a0[ND_ND]+=temp0*NV_DOT(A,xv);                //x·½ÏòµÄζÈÌݶÈÓë¿ØÖÆÌåx·½ÏòÍ¶Ó°Ãæ»ýµÄ³Ë»ý
                a1[ND_ND]+=temp1*NV_DOT(A,yv);
                a2[ND_ND]+=temp2*NV_DOT(A,zv);
        }
        end_f_loop(f,c_thread)

        source=diff*(a0[0]+a1[1]+a2[2])/vol;
        dS[eqn]=0;
        return source;
}
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