Inflow

The node adds a boundary condition for an inflow boundary, where the concentration for all species is specified in the manner of


	This condition is identical to the Concentration node, but is applied to all species and cannot be applied to individual species.

Concentration

Specify the concentration ci (SI unit: mol/m3) of each species individually by entering a value or expression in the corresponding field.

Boundary Condition Type

The option constrains the concentration values on the boundary by the use of pointwise constraints.

The other option, can be used when the concentration at the boundary is not known, or when it varies in a non-trivial manner. This may, for example, be useful when reactions with high reaction rates occur in the vicinity of the inlet. In this case the concentration far upstream of the boundary is instead prescribed. The condition prescribes the total flux defined by the upstream concentration and the fluid velocity at the boundary.


	Danckwerts Inflow Boundary Condition

Constraint Settings

To display this section, click the button (

) and select in the dialog box.