The H2 Outlet and O2 Outlet nodes are the preferred boundary conditions at outlets where the species are to be transported out of the model domain. It is useful at outlets where it is assumed that convection is the dominating effect driving the mass flow.

This node is available for exterior boundaries to Gas Phase nodes.

If the Include gas phase diffusion checkbox has been selected on the interface top node, the boundary condition is applied to all selected gas species and corresponds to:

If the Use Darcy’s law for momentum transport checkbox has been selected on the interface top node, the outlet Pressure can be specified.