DrAmine
Ansys Employee

If you are assuming that only N2 is entering at inlet then it is correct. If you are not expecting that only N2 will flow in then you need to provide the right mass/mole fraction of the composition.

 

At the outlet if you input the same as now at your inlet this will mean that in case of reversal flow  only N2 will enter from the outlet. Default Pressure Outlet in Ansys Fluent is acting as an Opening: it allows inflow and outflow.