# no. of objects: pipeb rectangular channel with curved pipe
   2
# ibfn ishape 
    1    7     solid rectangle by coordinates
  2.0 3.0,  0.0  1.0,  0.0  1.3
    8    0     curved hollow cylinder
    7          specify 7 points along centerline
   2.0   0.5  0.6   0.1
   2.5   0.5  0.6   0.1
   2.578 0.5  .5978 0.1
   2.65  0.5  .5598 0.1
   2.712 0.5  .512  0.1
   3.    0.5  .224  0.1
   3.2   0.5  .024  0.1