### 12.3.1. Multiple Fluid Domains

When consistent physics has been enforced, all settings are copied across all fluid domains when any fluid domain is edited with the following exceptions:

- Location: The location of each domain must obviously be different.

- Coordinate Frame: Each domain can use a different reference local coordinate frame.

- Domain Motion: Each domain can be independently stationary or rotating. For rotating domains, the angular velocity and axis of rotating can be different for each domain. This enables MFR simulations to be set up.

Note that these parameters are all set on the Basic Settings tab on the Domains form.

Fluid and Solid Domains: Settings are not copied between fluid and solid domains with the exception of Thermal Radiation Model. If any solid domain uses the Monte Carlo radiation model, then all fluid domains must also model radiation and must use the Monte Carlo model. If no solid domain has radiation modeling (that is, Option = `None`), then the fluid domains can use any radiation model.

Release 18.2 - © ANSYS, Inc. All rights reserved.