BoundaryMeshConstraint

Type:float, or section Range:[1e-15, inf] Default:-/- Appearance:multiple

This optional parameter allows control of the boundary discretization distinct from the MeshOptions employed for meshing of the interior of the domain. This parameter is specified in units of length (UnitOfLength).

The mesh constraint can be individually reset separately for any part of the boundary by specifying multiple BoundaryMeshConstraint sections instead of single primitive BoundaryMeshConstraint=10 :

BoundaryMeshConstraint{
  MaximumSideLength = 10
  Number = 1
}
BoundaryMeshConstraint{
  MaximumSideLength = 5
  Number = 2
}

The different boundaries are addressed by their Number (c.f. parent section for their definition).