Modeling of the Strain Rate Contribution to the Flame Surface Density Transport for Non-Unity Lewis Number Flames in Large Eddy Simulations

摘要: The strain rate contribution in the generalized flame surface density (FSD) transport equation remains a leading order unclosed source term, which plays pivotal role modeling of for all filter widths context large eddy simulations (LES). To date, most FSD-based closures have been proposed flames without differential diffusion effects heat and mass, characterized by global Lewis number equal to unity (i.e., ). arising due non-unity on FSD rarely analyzed existing literature. In present analysis, statistical behaviors term using DNS database freely propagating statistically planar turbulent premixed with ranging from 0.34 1.2 = 0.34–1.2). has split into components originating gradients Favre-filtered velocity ), s...