The Interior Wall, Interface condition can only be applied on interior interfaces of a layered shell. It is similar to the No Flux, Interface condition, except that it applies on interior interfaces and therefore on both sides of the interfaces. It allows discontinuities of velocity and pressure across the layer interface.

Set the interface for which the Interior Wall, Interface condition should be specified. Note that this node can only be applied to interior interfaces of a layered shell.

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.

You can visualize the selected interfaces by clicking the Layer Cross Section Preview () and Layer 3D Preview () buttons.