## 5.4. Mesh Connection Options

Domain interfaces connect meshes using two region lists. There are three mesh connection options:

- Automatic Connections

- Direct (One-to-One) Connections

- GGI (General Grid Interface) Connections

In certain situations, General Grid Interface (GGI) connections are used even when there is a direct (one-to-one) correspondence in nodes on either side of the interface. The rules for when this occurs are given below. If the physics permits a direct connection, the latter is usually preferable.

All domain interfaces automatically create boundary conditions of type “Interface” for the region lists used. For details, see Interface Boundary Conditions in the CFX-Pre User's Guide.

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