Boundary conditions for axial symmetry boundaries are not required. For the symmetry axis at r = 0, the software automatically provides a suitable boundary condition and adds an Axial Symmetry node that is valid on the axial symmetry boundaries only.

In the COMSOL Multiphysics Reference Manual see Table 2-4 for links to common sections and Table 2-5 to common feature nodes. You can also search for information: press F1 to open the Help window or Ctrl+F1 to open the Documentation window.