Periodic definition can be applied to the blocking in ICEM CFD. Typically, you will model only a section of the rotating machinery and implement symmetry in order to minimize the model size. By specifying a periodic relationship between the inflow and outflow boundaries, the particular specification can be applied to the model; flow characteristics entering a boundary must be identical to the flow characteristics leaving a boundary.

The periodic relationship is applied to block faces; and ensures that a node on the first boundary has two identical coordinates to the corresponding node on the second boundary. Using the Blocking > Edit Block > Periodic Vertices option, the application prompts you to select corresponding vertices on the two faces in sequence. When all vertices on both flow boundaries have been selected, a full periodic relationship between the boundaries has been generated.