### 10.8.2. Domain Interface Considerations

The following set of rules applies when modeling radiation through domain interfaces:

- For domain interfaces using the Conservative Interface Flux option, the radiation model must be the same on both sides of the interface.

- For a simulation with radiation and MFR interfaces, the two sides of the interface must be aligned and must have the same shape; no pitch change or orientation change is supported.

- For the Discrete Transfer and Monte Carlo radiation models, rotational periodic GGI interfaces are treated as symmetry conditions.

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