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thread_loop_c(t,domain)
  {
   begin_c_loop(c,t)
  {
        C_UDMI(c,t,0)=0;
        C_UDMI(c,t,1)=0;
        C_UDMI(c,t,2)=0;
  C_CENTROID(x,c,t);
  a=RP_Get_Real("flow-time";
  Dis=0.0;
  Dis_0=0.0;
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thread_loop_c(t,domain)
  {
   begin_c_loop(c,t)
  {
        C_UDMI(c,t,0)=0;
        C_UDMI(c,t,1)=0;
        C_UDMI(c,t,2)=0;
  C_CENTROID(x,c,t);
  a=RP_Get_Real("flow-time";
   x_0=x[0];
   y_0=x[1];
   z_0=x[2]+0.16-0.0005*a;
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achilFes1990

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