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====== Wire extrusion ======

  * The ALE formalism is used for simulating this stationary process.
  * The mesh is Eulerian (every nodes are moved back to their initial position after each step). This avoids to consider a very large Lagrangian mesh. 
  * The problem is axisymmetric.
  * The wire is pulled from the top through a rigid die.
  * The penalty method is used for the contact between the die and the wire.  
  * After a brief transient state, the stationary state is reached.

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