Physical and numerical realizability requirements for flame surface density approaches to large-eddy and Reynolds averaged simulation of premixed turbulent combustion

摘要: In the flamelet regime of turbulent premixed combustion, flame surface density (FSD) models for Reynolds averaged and large-eddy simulation (LES) should satisfy realizability requirement Σ≥|∇c¯|. Some commonly employed FSD are analysed from this perspective it is found that several may not criteria under all flow conditions. Suggestions made adjustments to choice model parameters such guaranteed in one-dimensional constant case. The suggestions supported with physical arguments based on links between progress variable FSD. Another rather different issue concerns local simulated thickness LES. This important both physically numerically. Physically expected be approximately same order as filter size, Δ. most approaches LES shape p...