FDF Simulation of Swirling Reacting Flows on Unstructured Meshes

Large eddy simulation (LES) is conducted of the Sydney swirl burner (SM1 flame). The subgrid scale (SGS) closure is based on the scalar filtered mass density function (SFMDF). A flamelet model is used to relate the instantaneous composition to the mixture fraction. The modeled SFMDF transport equation is solved by a new hybrid finite-volume / Monte Carlo scheme, on a domain portrayed by unstructured grids. The mesh dependence of LES results is studied on a series of grids with progressively increased resolution, reaching over 2 million computational elements. The overall agreement between LES/SFMDF predictions and measured data is very good. The agreement improves as the resolution increases.

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