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/*²ÉÓÃÐýת¸ß˹ÌåÈÈÔ´*/
/*ÄÜÁ¿Ô´Ïî*/
#include "udf.h"
DEFINE_SOURCE(heat_flux, cell, thread, dS, eqn)         
{
real x[ND_ND];
real y,I,U,oq,t0,v0,Q,time,cs,HH;
real r,rh;
real source_heat;
cell_t c;
C_CENTROID(x,c,thread);
y=0.7;                        /*ÓÐЧ¹¦ÂÊÒò×Ó*/
U=16.;
I=100.;
v0=2.e-3;                /*º¸½ÓËÙ¶È*/
Q=y*I*U;                /*ÓÐЧ¹¦ÂÊ*/
cs=3./pow(oq,2.);        /*ÐÎ×´Òò×Ó*/
HH=1.e-3;                /*ÈÈÔ´¸ß¶È*/
oq=2.5e-3;                /*ÈÈÔ´°ë¾¶*/
time= RP_Get_Real("flow-time";
r=sqrt(pow(x[0]-v0*time,2.)+pow(x[1],2.));        /*×ø±êÓëÈÈÔ´ÖÐÐĵľàÀë*/
rh=sqrt(log(HH/x[2])/3.)*oq;/*Ò»¶¨ÈÈÔ´¸ß¶È¶ÔÓ¦µÄ°ë¾¶rh*/
if (x[2]==0&&r<=oq)
{
        source_heat=3.*cs*Q/(3.14*HH*(1.-1./exp(3)))*exp(-3.*pow(r,2.)/pow(oq,2.));
        dS[eqn] =0;
}
else if (x[2]==HH&&r==0.)
{
        source_heat=3.*cs*Q/(3.14*HH*(1.-1./exp(3)));
        dS[eqn] =0;
}
else if (x[2]>HH)
{       
        source_heat=0;
        dS[eqn] =0;
}
else if (r<=rh)
{
        source_heat=3.*cs*Q/(3.14*HH*(1.-1./exp(3)))*exp(-3.*cs/log10(HH/x[2])*pow(r,2.));
        dS[eqn] =0;
}
else
{
        source_heat= dS[eqn] =0;
}
return source_heat;
}

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