Reacting Flow

Whether simulating combustion design in gas turbines, automotive engines, or coal-fired furnaces or assessing fire safety in and around buildings and other structures, ANSYS Fluent software provides a rich framework to model chemical reactions and combustion associated with fluid flow. With ANSYS Fluent, you can use non-premixed, partially-premixed, or premixed combustion models to accurately predict parameters like the flame speed, flame location, and the post-flame temperature. These models can assume equilibrium chemistry. In situations in which the chemistry is assumed to be relatively fast, but not at equilibrium, the laminar flamelet model with presumed probability density function (PDF) offers a practical and efficient means to depict the detailed chemistry of hundreds of species without having to solve hundreds of transport equations.

ANSYS Fluent also offers innovative models such as the eddy dissipation concept, PDF transport, and stiff finite rate chemistry models as well as mature models including the eddy dissipation concept (EDC) and finite rate models. In-situ adaptive tabulation (ISAT) used in conjunction with either the EDC or PDF transport models speeds up those calculations by an order of magnitude or more.

The extended coherent flamelet model (ECFM) is suited for specific applications like internal combustion engines.

The reacting flow models available in ANSYS Fluent can be used to tackle a vast array of gaseous, coal and liquid fuel combustion simulations. Special models for the prediction of SOx formation and NOx formation and destruction are also available. The technology's surface reaction capability allows for reactions between gas and surface species as well as between different species, so that deposition and etching can be rigorously predicted. The ANSYS Fluent reaction models can be used in conjunction with the real gas model and LES and DES turbulence models.

View Larger ImageLow NOx burnerCourtesy GE Energy.