10/23/2014

Introduction to CFX -Advanced Physics Overview

A wide range of models are available to simulation combustion reactions
Eddy Dissipation Model
suitable for fast reactions
Finite Rate Chemistry Model
suitable for slower reactions
Single and multi-step reactions
Laminar Flamelet Model
suitable for diffusion flames (reaction occurs only at the flame surface)

NOx and Soot models

Extended Coherent Flame Model
Used for premixed or partially premixed combustion, where fuel and oxidizer do not immediately burn when mixed
Includes wall quenching capability, where reaction stops when mixture touches a wall
Recommended for Internal Combustion Engine studies

Residual Material Model
Unburned reactants from one combustion cycle can be burned in future cycles
Can be used to model Exhaust Gas Recirculation
Auto-Ignition
When fuel and air is at sufficiently high temperature, ignition occurs
Used for modelling compression-ignition engines (diesel engines)
Can be used to predict premature ignition (“knock”) in spark-ignition engines


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