Boundary conditions must be applied to all the bounding regions of your domains. Boundary conditions can be inlets, outlets, openings, walls, and symmetry planes.
Unspecified external regions are automatically assigned a no-slip,
adiabatic wall boundary condition. Such regions assume the name <Domain> Default, where <Domain> corresponds to the name of the domain. Unspecified internal boundaries
are ignored.
You can apply boundary conditions to any bounding surface of a 3D primitive that is included in a domain (including internal surfaces). If you choose to specify a boundary condition on an internal surface (for example, to create a thin surface), then boundary conditions must be applied to both sides of the surface.
This chapter describes:
Additional information on boundary conditions is available in: