Connecting domains or assemblies

Domain interfaces are required to connect multiple unmatched meshes within a domain (for example, when there is a hexahedral mesh volume and a tetrahedral mesh volume within a single domain) and to connect separate domains.

Modeling changes in reference frame between domains

This occurs when you have a stationary and a rotating domain or domains rotating at different rates.

Creating periodic interfaces between regions

This occurs when you are reducing the size of the computational domain by assuming periodicity in the simulation.

Creating thin surfaces

Thin surfaces enable you to model physics such as heat transfer across a thin material or gap without needing to explicitly mesh the surface. For example, thin surfaces can be used to model contact resistance at a solid-solid interface, a thin film on a fluid-solid interface, or a thin baffle at a fluid-fluid interface.