Axial Symmetry
For 2D axisymmetric components, COMSOL Multiphysics takes the axial symmetry boundaries (at r = 0) into account and automatically adds an Axial Symmetry node to the component that is valid on the axial symmetry boundaries only.
When Electric field components solved for in the Components property for The Electromagnetic Waves, Frequency Domain Interface is set to either Three-component vector or Out-of-plane vector a constraint is added on the symmetry axis
For more information, see Covariant formulation. This formulation is used for all study steps, except Mode Analysis and Boundary Mode Analysis.
Constraint Settings
In the COMSOL Multiphysics Reference Manual, see the Constraint Settings for more information about this section.