The Flow Continuity condition is suitable for pairs where the boundaries match; it prescribes that the flow field is continuous across the pair.
When the condition is set for pairs adjacent to domains with different porosity εp, it imposes conditions identical to the
Porous Interface feature, which is designed to properly account for a sudden jump in porosity. See the section
Porous Interface above for further details (note that the
Flow Continuity does not account for the density-jump corrections),