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Boundary types

Basic types of boundaries in OpenFOAM are shown in following table:

Boundary type	Description
patch	general boundary (e.g. inlet, outlet)
symmetryPlane	symmetry
empty	empty, only for 2D computations
wedge	axis symmetry
cyclic	periodic (cyclic) boundary condition
cyclicAMI	generalized cyclic
wall	rigid wall
processor	inter-processor boundary (parallel computations)

Boundary types are set in constant/polyMesh/boundary
patch
Patch condition contains no geometric or topological information about mesh. Typically patch is used for an inlet or an outlet.
symmetryPlane
Symmetry plane (mirroring quantity)
empty
Empty boundary condition is used for simplified cases (quasi 3D fluid flow)
wedge
Axis symmetric computations, see figure .
cyclic
Periodic boundary condition for regularly repeating solution (translation, rotation).
cyclicAMI
Generalized cyclic, there is no need for meshes to fit each other point to point. Useful for cyclic cases and for connecting meshes consisting of more regions.
wall
Rigid walls
processor
When domain decomposed into sub-domains

Figure: OpenFOAM Wedge case example

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