The Outflow boundary condition should be applied at outlets where species are transported out of the model domain. This boundary condition makes sure that transport losses by diffusion do not exist but transport losses by convection, migration in the electric field, and others can still exist. This node is available for exterior boundaries. By default the boundary condition is applied to all neutral heavy species. By selecting the option
Include ions the boundary conditions is also applied to all ions. The following boundary condition is applied depending on the selection made in the
Diffusion Model section:
