Use the Flux Discontinuity node to specify a mass flux discontinuity through an interior boundary. The condition is represented by the following equation:

In this equation, n is the vector normal (perpendicular) to the interior boundary, ρ is the fluid density, u1 and u2 are the Darcy velocities in the adjacent domains (as defined in Equation 4-19) 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 boundary.

Enter a value or expression for the Inward mass flux N0 (SI unit: kg/(m2·s)). A positive value of N0 represents a mass flux discontinuity in the opposite direction to the normal vector of the interior boundary.