Use the Flux Discontinuity, Interface node to specify a mass flux discontinuity through an interior interface of a layered shell. The condition is represented by the following equation:
In this equation, n is the vector normal (perpendicular) to the interior layer interface,
ρ is the fluid density,
u1 and
u2 are the Darcy velocities in the adjacent domains, and
N0 is a specified value or expression for the flux discontinuity.
For this boundary condition, a positive value of N0 corresponds to a flow discontinuity in the opposite direction to the normal vector of the interior layer interface.
The available options in the Apply to list are
Interior interfaces, which is the default setting, and
Selected interfaces. With the last option you can select a set of interfaces and the layered material for which the boundary interface condition should be active. Note that the checkboxes for exterior interfaces of the layered material are deactivated for this node.
Enter a value or expression for the Inward mass flux N0 (SI unit: kg/(m
2·s)). A positive value of
N0 represents a mass flux discontinuity in the opposite direction to the normal vector of the interior boundary.
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