The application of time-derivative preconditioning methods to the computation of chemically reacting flowfields is presented. The preconditioning procedure is selected to account for low speed effects, viscous effects and high grid aspect ratios, and therefore, provides efficient convergence under a wide range of flow conditions. In addition, methods of tackling the non-linear effects that predominate during the initial stages of computation are also considered. Both laminar and turbulent diffusion flame computations, that are representative of practical combustion applications, are presented to demonstrate the capabilities of the algorithm.
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