Symmetry
Due to the overwhelming number of species that can exist in a plasma, the Symmetry boundary condition subnode is available from the context menu (right-click the Species parent node) or from the Physics toolbar, Attributes menu. This simplifies and orders the process of assigning boundary conditions for a large number of species in a model.
The Symmetry subnode is used on all boundaries where the selected species mass fraction is symmetric. This is identical to the No Flux boundary condition. The symmetry boundary imposes a zero flux boundary condition.