### 27.2.4. Flamelet Library

A flamelet library is imported with optional customization of the `Laminar Burning Velocity`.

1. Set Option to `Flamelet Library`.

2. Click Browse to browse to the flamelet library file. The file that contains your flamelet library should be selected.

3. Optionally, select Reaction Description to enter a description for the reaction.

4. Select Laminar Burning Velocity to specify an expression for the laminar flame speed definition.

When using a flamelet library, the definition for the library is specified in the Reaction details view. The name, library file and, optionally, laminar flame speed definition is specified. The reaction can then be used in a fluid that is a variable composition mixture. For details, see Material Details View: Variable Composition Mixture. and Laminar Flamelet with PDF Model in the CFX-Solver Modeling Guide.

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