## 9.9. Extended Coherent Flame Model (ECFM)

The Extended Coherent Flame Model (ECFM) is a combined model employing:

- A model for the progress of the global reaction: Extended Coherent Flame Model (ECFM), which is a member of the class of Flame Surface Density Models

- A model for the composition of the reacted and non-reacted fractions of the fluid: Laminar Flamelet with PDF. For partially premixed configurations this model does also implement post-flame fuel oxidation (diffusion flame tail)

The coupling of ECFM with the flamelet model for effects of non-premixedness extends the range of applicability of the model similar to the three-zones extension of the model found in the literature (ECFM-3Z).

The following topics will be discussed:

- Fluid Models

- Spark Ignition Model

- Boundary Settings

- Initialization

- Solver Parameters

- Other Parameters

Information on the theory behind the Extended Coherent Flame Model is available in Extended Coherent Flame Model (ECFM) in the CFX-Solver Theory Guide.

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