Filtered Tabulated Chemistry for non-premixed flames

The objective of the present study is to design a modeling strategy for LES of laminar diffusion flame regimes, i.e. without SGS wrinkling. A non-premixed model dedicated to capture unresolved laminar flame structure is then proposed. For that purpose, the Filtered Tabulated Chemistry for Large Eddy Simulation is adapted to diffusion flames. A filtered look-up table computed from a collection of strained 1-D counterflow flames is generated. The filtered flame structure and thickness is captured with three controlling variables which are the filtered mixture fraction, the filtered progress variable and the filter size. This approach is successfully applied to 1-D and 2-D unresolved counter-flow flame simulations. The filter size governs the minimal thickness of the filtered thermal layer.