A priori testing of a similarity model for large eddysimulations of turbulent premixed combustion

An assessment of large eddy simulations of premixed flames propagating past repeated obstacles

“…This fact has been recently exploited by using inner cut-off scale equals to three times of laminar flame thickness [4]. Accordingly, a lower cut-off scale equal to three times of laminar flame thickness is used in the present work.…”

“…Large Eddy Simulations (LES) are now accepted as a feasible computational tool in turbulent combustion [1][2][3][4][5] despite the added computational cost and the need for subgrid scale (SGS) modeling. LES has a clear advantage over classical Reynolds averaged methods in the capability of accounting of time-varying nature of the flows and this is particularly important in transient processes such as swirling flows or turbulent premixed propagating flames.…”

Large Eddy Simulation of Premixed Turbulent Flames Using the Probability Density Function Approach

“…All these methods have common characteristics as they all look for a closure of the turbulent flame speed through the FSD equation and they are restricted to the premixed regime, in most cases away from the broken reaction zones. Other premixed-specific approaches found in the literature include variants of the flamelet concept typical of non-premixed flames; the flamelet generated manifold method (FGM) [16], application of the similarity model [17] and the broadened flame model [18] among others. A complete review of LES models for premixed combustion is outside the scope of this paper, and the reader is referred to the literature [19].…”

Large Eddy Simulation of Premixed Combustion in Spark Ignited Engines Using a Dynamic Flame Surface Density Model

“…Another promising approach is to solve a transport equation for the wrinkling factor as in [43]. Alternatively, the SGS contribution of FSD can be explicitly calculated from the resolved quantities [44][45][46][47].…”

“…Current approach is particularly attractive because of less computational time involved whereas, it needs a significant time to evaluate gradients particularly in unstructured grids. The inner cut off scale is taken here as three times the thermal flame thickness following [22,[44][45][46][47].…”