Solver: Models
Combustion
ANSYS CFX solves all species as a single coupled system greatly accelerating convergence, especially for complex reaction mechanisms. Flame ignition and extinction phenomena are included through chemical timescale, temperature and mixing-rate limiters. Reaction mechanisms and species are selected from a database that can be customized by the user
State-of-the-art models including flamelet and flamefront (flamespeed) combustion are also available.
The flamelet model is accompanied by a user-operable flamelet library generator which allows users to select chemical species and reaction mechanisms to produce a custom library, or lookup table. This allows for the solution of hundreds of chemical species without having to solve hundreds of transport equations.
A general framework for single and multiphase reactors is provided to allow modeling of a broad range of solid, liquid and gaseous fuels.
ANSYS CFX software includes an extensive library of pre-defined reaction mechanisms, which can be easily extended to the user's own sources of data.
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Methane combustion taking into account |
Reacting Flows
Gain insight into the most complex combustion processes and reactions involving gaseous, liquid and solid fuels.
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Multi-fuel/multi-oxidant combustion: Co-firing of solid or liquid and gaseous fuels or multiple oxidant streams of different composition (e.g. air and pure oxygen) can all be studied. Our expertise will help you to predict the kinetics of multi-fuel combustion and obtain information on the relative reaction rates of the different fuels and oxidants. |
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Radiative heat transfer: Radiation modeling calculates radiative heat transfer, taking full account of shadowing effects in complex three-dimensional geometries for gray and non-gray systems. The algorithm tracks photons, or rays, using several methods. You can predict radiation through conducting solids, including glass, and two-way radiative coupling with particles. |
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Prediction of NOx Emissions: In many combustion simulations, the primary goal is to minimize the emissions of nitrogen oxides (NOx). You can achieve this by automatically calculating the production of thermal, prompt, fuel-derived and reburn NOx with the NOx module. |
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Coupled solver for chemical reactions: For chemical systems involving several species and reactions, our efficient coupled solver performs simultaneous solution of the various chemical species and temperature. This provides high stability where reaction rates are fast relative to the local flow time scales. Coupled solutions are essential where a wide range of time scales exist, so-called "numerically stiff systems", which is often the case in combusting and reacting flows. |
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Explosion and deflagrations: Our effective means of simulating the complex physical phenomena that occur during explosions and deflagrations allows you to predict the three stages of a deflagration: firstly the ignition; then a laminar and low-turbulence thin-flame phase, and finally a high-turbulence thick-flame stage. |
Furnace model with 24 burners and 5 sets of super heater platens assuming centre-line symmetry
[ View AVI Animation]