A recently developed method for reducing reaction mechanism

the reaction-diffusion manifolds (REDIM) method

is combined with the presumed filtered density function (PFDF) to construct a new sub-grid scale (SGS) combustion model for large eddy simulation (LES) of turbulent combustion. Unlike its predecessor intrinsic low-dimensional manifolds method

the REDIM method takes into account the coupling of reaction and molecular transport processes explicitly

so it is capable of describing fast reaction regions as well as regions where chemical kinetics are slow and diffusion governs the overall process. Because of this advantage of REDIM

the new SGS combustion model is theoretically capable of simulating turbulent partially premixed flames and stratified flames

in which reaction and diffusion processes are both important. For validating its performance

the new model is employed to simulate the benchmark Darmstadt turbulent stratified flame (TSF). First

a grid resolution study is conducted by computing isothermal flow field with two grids. Then the finer grid is used to simulate a turbulent flame with stratified effect. The overall good agreement of the statistics of velocity

temperature and species with the experimental data demonstrates the capability of the LES method and the REDIM-PFDF model for dealing with TSF. More simulations for other Darmstadt TSF cases are still ongoing

to obtain a deeper insight of the complex chemistry-physical process in the TSF combustion.