## 2.6. Opening

An opening can be used at a boundary where the flow is into and/or out of the domain. The opening boundary condition type is only available for subsonic boundaries.

Information on setting the values for an opening in CFX-Pre is available. For details, see Boundary Details: Opening in the CFX-Pre User's Guide.

Information on the mathematical implementation of an opening boundary condition is available in Opening in the CFX-Solver Theory Guide.

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