Use the Mass Flux node to specify the mass flux into or out of the model domain through some of its boundaries. It is often possible to determine the mass flux from the pumping rate or from measurements. With this boundary condition, positive values correspond to flow into the model domain:
where N0 is a value or expression for the specified inward (or outward) Darcy flux.
D is the elevation head which is set to zero for other than Subsurface Flow Module applications.
Enter a value or expression for the Inward mass flux N0. A positive value of
N0 represents an inward mass flux whereas a negative value represents an outward mass flux. The units are based on the geometric entity:
Boundaries: (SI unit: kg/(m
2·s)).
