### 9.7.1. Fluid Models

The models settings described in this section are set when creating a domain in CFX-Pre. For details, see Domains in the CFX-Pre User's Guide.

#### 9.7.1.1. Component Details

Because transport equations are not solved for species involved in the flamelet library reactions, you should select either `Library` or `Automatic` for all such components.

Always set N2 to be a constraint. Components other than N2 and components covered by the flamelet library must be set to Automatic or Library.

Components not covered by the flamelet library should be set to `Transport Equation`. The transport equation components must be minor components, as they are either postprocessed or their added mass fractions will be subtracted from the mass fraction of the constraint material. For details, see NO Model.

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