Assessing diffusion model impacts on enstrophy and flame structure in turbulent lean premixed flames

Diffusive transport of mass occurs at small scales in turbulent premixed flames. As a result, multicomponent diffusion, which is often neglected direct numerical simulations (DNS) combustion, has the potential to impact both turbulence and flame characteristics scales. In this study, we evaluate these impacts by examining enstrophy dynamics internal structure for lean hydrogen-air neglecting secondary Soret Dufour effects. We performed three-dimensional DNS flames implementing Stefan-Maxwell equations code NGA represent transport, simulated statistically planar using mixture-averaged models. The model underpredicts peak up 13% front. Comparing budgets flames, simulation yields larger magnitudes compared reaction zone, showing differences 17% 14% normalized stretching viscous effects terms. super-adiabatic regions flame, overpredicts 13%. To assess effect on structure, reconstructed average local through statistical analysis scalar gradient field. Based analysis, show that large contribute significant between two