A novel, robust numerical framework for the simulation of chemicallyreacting ows is developed. The highly stiff reacting Navier-Stokes equa-tions are integrated in time using the unconditionally positive-convergent(UPC) implicit method. The scheme is successfully extended in thiswork for use with chemical kinetics models, and several modicationsaimed at improving its efficiency are proposed.The proposed scheme is robust thanks to being nearly free of arti-cial stabilization techniques that are commonly used to avoid numericaldifficulties associated with nite rate chemistry models. In addition,the iterative method is highly efficient thanks to the decoupled implicitsolution of the mean-ow (Navier-Stokes) and chemical kinetics modelequations, especially when large reaction mechanisms are employed.Results obtained from simulation of challenging test cases involv-ing laminar combustion are presented. The obtained numerical resultsagree favorably with experimental measurements, and monotonic iter-ative convergence is demonstrated for CFL numbers of the chemistrymodel equations of up to 100.
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