This node can be added to pairs, or as a subnode of the Fluid and Porous Matrix subnodes under Porous Medium. It prescribes that the temperature field is continuous across the boundary. When applied to pairs, Continuity is only suitable for pairs where the boundaries match. When added as a subnode of the Fluid and Porous Matrix subnodes under Porous Medium, it ensures the continuity of the temperature and flux between the specific phase (fluid or solid) and the medium on the other side of the boundary (fluid, solid, building material, biological tissue,...). If a thin structure model (Thin Layer (Heat Transfer Interface) and Solid (Heat Transfer in Shells Interface), Thin Film (Heat Transfer Interface) and Fluid (Heat Transfer in Shells Interface), or Fracture (Heat Transfer Interface) and Porous Medium (Heat Transfer in Shells Interface)) is defined on the boundary, the Continuity node may be applied as well.

If this node is selected from the Pairs menu, choose the pair to apply this condition to. A pair must to be created first. See Identity and Contact Pairs in the COMSOL Multiphysics Reference Manual for more details.

Physics tab with interface as Heat Transfer in Solids and Fluids or any version of the Heat Transfer interface, Heat Transfer in Shells, Radiation in Participating Media or Surface-to-Surface Radiation selected: