## 14.3. Interface Boundary Conditions

All domain interfaces automatically create boundaries of type `Interface` that contain the regions used in the domain interface. These boundaries are named `<Domain Interface Name> Side <Number>`. For example, for a domain interface named `myInterface`, the related boundary conditions would be called `myInterface Side 1` and `myInterface Side 2`. At least one of these boundaries will be auto-created for each domain involved in the interface. You can edit these boundaries like any other boundary, but you cannot create new interface boundaries directly.

You will usually not need to edit an auto-generated Interface boundary, but options are available for fluid-solid interfaces (which can be considered a special case of wall boundaries). Settings and options available when editing interface boundaries can be configured. For details, refer to the following sections:

- Boundary Details: Interfaces

- Fluid Values for Interfaces

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