Assessment of flamelet manifolds for turbulent flame-wall interactions in large-eddy simulations

A turbulent side-wall quenching (SWQ) flame in a fully developed channel flow is studied using Large-Eddy Simulation (LES) with tabulated chemistry approach. Three different flamelet manifolds increasing levels of complexity are applied: the Flamelet-Generated Manifold (FGM) considering varying enthalpy levels, Quenching (QFM), and recently proposed Exhaust Gas Recirculation (QFM-EGR), purpose being to assess their capability predict flame-wall interactions (FWIs), which highly relevant numerical simulations real devices such as gas turbines internal combustion engines. The accuracy three evaluated compared posteriori, data from previously published flame-resolved simulation detailed for reference. For LES FGM, main characteristics mean field, temperature, major species can be captured well, while notable deviations reference results observed near-wall region, especially pollutant CO. In accordance findings laminar FWI, improvement also QFM under conditions. Although QFM-EGR shows similar performance prediction quantities QFM, it presents significantly better agreement regarding instantaneous thermo-chemical states near point. This indicates necessity take into account mixing effects manifold correctly capture flame-vortex interaction tip configurations. Based on this study, suitable chosen depending aspects interest practical applications.