Differential diffusion in tabulated chemistry: From model development to practical applications

Tabulated chemistry has been used to reduce the computational cost of chemistry and help close terms in the transport equations of Large Eddy Simulations. Various tabulated chemistry models utilize a single Lewis number in the progress variable transport equation to account for differential diffusion effects. In this work, a tabulated chemistry model is extended to include thermal diffusion coefficients and non-unity Lewis numbers for more than just the progress variable or fuel. A derivation of the model is given, and a wide range of lean hydrogen/air flame configurations are examined, including one-, two-, and three-dimensional flames under laminar and turbulent conditions. Comparisons of flame speeds, surface areas, source terms, and flame curvatures are done between the previous and new tabulated chemistry models, and a practical application of the tabulated chemistry method is considered in a low-swirl burner.