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DEFINE_SOURCE(heat_source,c,t,dS,eqn)
{
cell_t c;
Thread *t;
real source;
real current_timestep;   /*as word means*/
real current_time;
current_time = RP_Get_Real("flow-time";
current_timestep = RP_Get_Real("physical-time-step";

if(current_time > 0.05)
        {
                   source = 340000000. * exp(-3 * 0.01 * pow (10,-4) * (C_UDMI(c,t,1) - C_UDMI(c,t,0)));/*ÈÈÔ´ÏÊý*,´ËÐÐÓÐÎó*/
   return source;
  }
else
        {  
        return 340000000.;
        }      
      
}
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