FEM ElementFluid1D

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FEM ConstraintContact.png FEM ConstraintContact

Menu location
FEM → Constraint contact
Default shortcut
Introduced in version
See also
FEM tutorial


Creates a FEM fluid section element for aerodynamic and hydraulic networks


  1. Click on FEM ElementFluid1D.png or choose FEMFEM ElementFluid1D.png Fluid section for 1D flow from the top menu.
  2. Select Fluid type: Liquid, Gas or Open Channel
  3. Select Section type: Pipe Manning, Pipe Inlet etc.
  4. Enter Section type parameters.
  5. Select and add edge.


  1. The contact constraint can only be applied to two faces.


  1. The contact stiffness should be 10 times the young's modulus of the material for hard contact. The higher the value for contact stiffness, the harder the contact between surfaces.
  2. The slave face is the face which penetrates into the master face, and therefore experiences more deformation.
  3. The *CONTACT PAIR card is used for modeling contact in CalculiX. The constraint uses Face-to-Face penalty contact and the contact formulation is explained in detail at http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node112.html
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