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Node Types
There are three node types: 
- 1D fluid nodes. These are nodes satisfying at least one of the following
  conditions:
 
- nodes belonging to 1D network elements (element labels starting with D)
- reference nodes in *FILM cards of type
  forced convection (label: F*FC).
- reference nodes in *DLOAD cards of type nodal pressure
  (label: P*NP).
 
 
- 3D fluid nodes. These are nodes belonging to 3D fluid elements (element
  labels starting with F)
 
- structural nodes. Any nodes not being 1D fluid nodes nor 3D fluid nodes.
 
It is not allowed to create equations between nodes of different types.
guido dhondt
2015-11-19