### 9.9.1. Fluid Models

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

#### 9.9.1.1. Laminar Flame Thickness

The laminar flame thickness is an important input quantity to the Extended Coherent Flame Model. The following options are available:

- Blint: Applies Blint’s correlation for laminar flame thickness. See Laminar Flame Thickness in the CFX-Solver Theory Guide for the definition of the correlation.

- Value: Specify a CEL expression for the laminar flame thickness.

#### 9.9.1.2. Component Details

It is recommended that you choose to be the constraint, which is the default. The remaining components in 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 should be minor species, 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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