Example Problems in LES Combustion

This memorandum provides a brief introduction to finite rate chemistry in the framework of large eddy simulation for compressible flow fields. Particular emphasis is placed upon the filtered reaction rate expression through the use turbulent chemical closure terms. The Eddy Break-Up model is an example of this type of closure term. Within the multiphase physics computer code LESLIE3D, these algorithms are tested on a gas phase acetylene combustion problem and on a shock wave initiated droplet evaporation and combustion problem. Results are shown for each problem. Comparisons are shown for kinetic and Eddy Break-Up model filtered reaction rates. For the droplet problem, droplet evaporation, combustion and product formation is demonstrated.