A FINITE-VOLUME SCHEME ON UNSTRUCTURED GRIDS FOR STIFF CHEMICALLY REACTING FLOWS

Obtaining efficient acid robust solutions to real reacting how problem s is a challenging task in numerical simulation due to severe nonlinea rities in the conservation equations and the wide range of time scales of chemical reactions. However, there are many important industrial a pplications for such simulations, e.g., premixed and non-premixed comb ustion, catalytic combustion, or materials processing. A finite volume method on unstructured, non-staggered grids is presented for the solu tion of two-dimensional low Mach number reacting flows. The conservati on law form of the flow equations are discretized in terms of primitiv e variables. An artificial compressibility method is employed so that low Mach number flows can be solved economically. The equations are ma rched in time using an implicit extrapolation method. Numerical result s are obtained for three different applications: A reaction-diffusion- controlled flow in the process chamber of a chemical downstream etch s ystem, the simulation of a premixed ozone flame, and a methane diffusi on flame.