Introduction

A 300KW BERL combustor simulation is modeled using a Probability Density Function (PDF) mixture fraction model. The reaction can be modeled using either the species transport model or the non-premixed combustion model. In this tutorial you will set up and solve a natural gas combustion problem using the non-premixed combustion model for the reaction chemistry.

This tutorial demonstrates how to do the following:

• Define inputs for modeling non-premixed combustion chemistry.

• Prepare the PDF table in ANSYS FLUENT.

• Solve a natural gas combustion simulation problem.

• Use the P-1 radiation model for combustion applications.

• Use the $k$- $\epsilon$ turbulence model.

The non-premixed combustion model uses a modeling approach that solves transport equations for one or two conserved scalars and the mixture fractions. Multiple chemical species, including radicals and intermediate species, may be included in the problem definition. Their concentrations will be derived from the predicted mixture fraction distribution.

Property data for the species are accessed through a chemical database and turbulence-chemistry interaction is modeled using a $\beta$-function for the PDF . For details on the non-premixed combustion modeling approach, see this chapter in the separate User's Guide.