The Interior Wall boundary condition is used to model a wall condition on an interior boundary. It is similar to the Wall boundary condition available on exterior boundaries except that it applies on both sides (up and down) of an internal boundary. It allows discontinuities (in pressure, velocity, and temperature) across the boundary. Use the Interior Wall boundary condition to avoid meshing thin structures by applying this slip-like condition on interior curves and surfaces instead.

Select a Mechanical condition — No slip (the default) or Slip. See the No Slip and Slip conditions for further details.

Select a Thermal condition — Isothermal (the default) or Adiabatic. See the Isothermal and Adiabatic conditions for further details.

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If Slip is selected for the Mechanical condition and Use weak constraints is enabled then the default discontinuous Galerkin (penalty like) formulation is switched to a Lagrange multiplier formulation instead. For the No-slip and Isothermal selections a weak formulation is used instead of a pointwise constraint.