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liushugao

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DEFINE_SOURCE(xmom_source,c,t,dS,eqn)
{
  real ¦Òj,T,T0,¦Â;
  real Amush,¦Å,u,v,w;
  real re,ri,r0,r,time;
  real x,y,z,HH,fx,source;
  real X[ND_ND];
  C_CENTROID(X,c,t);
  x=X[0];
  y=X[1];
  z=X[2];
  re=0.005;
  ri=0.003;
  HH=0.006;
  Amush=10000;
  ¦Å=0.001;
  u=C_U(c,t);
  v=C_V(c,t);
  w=C_W(c,t);
  r0=re-(re-ri)*z/HH;
  time=RP_Get_Real("flow-time";
  r=sqrt((x-u0*time)*(x-u0*time)+y*y);
  T=C_T(c,t);
  T0=273.15;
  ¦Òj=0.004;
  if(T   {
    ¦Â=0;
  }
  else if(TTsolidus)
  {
    ¦Â=(T-Tsolidus)/(Tliquidus-Tsolidus);
  }
  else if(T>Tsolidus)
  {
    ¦Â=1;
  }
  if(r==0.)
  {
      fx=-¦Ì0 *I*I*(1-z/L)*(1-z/L)*x/8/PI/PI/¦Òj/¦Òj/¦Òj/¦Òj;
  }
  else if(r>0.)
  {
      fx=-¦Ì0 *I*I*(1-z/L)*(1-z/L)*x*exp(-r*r/2/¦Òj/¦Òj)*(1-exp(-r*r/2/¦Òj/¦Òj))/r/4/PI/PI/¦Òj/¦Òj/r;  
  }
  source=(-Amush*(1-¦Â)*(1-¦Â)*u/(¦Â*¦Â*¦Â+¦Å))+fx;
  dS=0;
  return source;
}

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