rfpm 3D model - gauge condition
Hello,
Looking at the rfpm.pro example (3D model of a RFPM machine), I do not understand the meaning of the 'gauge' constraint.
// A correct spanning-tree is essential to the validity of the model.
// The spanning-tree must be autosimilar by rotation on the sliding surfaces
// (SubRegion2 clause, only the edges aligned with the Z axis are placed in
// the tree), and be also a spanning-tree and Dirichlet and Link surfaces and
// their boundaries (SubRegion clause).
{ Name GaugeCondition_a ; Type Assign ;
Case {
{ Region Vol_Tree ; Value 0. ;
SubRegion Region[ { Sur_Tree, Lin_Tree} ] ;
SubRegion2 Region[ Sur_Tree_Sliding, AlignedWith Z ] ;
}
}
}
What does this constraint do? Why is it needed? Would its implementation for a 3D AFM model be needed or differ?
(my current implementation of it does not make sense)
Thanks in advance!
Regards,
Theo