The Flux Discontinuity node represents a discontinuity in the mass flux across an interior boundary:
where the value of N0 specifies the size of the flux jump evaluated from the down to the upside of the boundary.
Select the Species check boxes to specify a flux discontinuity, and enter a value or expression for the
Flux discontinuity N0 (SI unit: kg/(m
2·s)) in the corresponding field,
N0, w1 for example. To use a different boundary condition for a specific species, click to clear the check box for the flux discontinuity of that species.