Direct numerical simulation of flame–wall interaction at Reτ=544

Abstract

A fully resolved direct numerical simulation is performed to examine flame–wall interactions at a friction Reynolds number of 544. The engine-relevant conditions are simulated, with a methane–air flame at 800 K, anchored in a channel, propagating two flame branches that interact with isothermal walls at 300 K and 800 K, respectively. This way, the flame near the 300 K wall interacts with a thermal boundary layer, whereas the flame near the 800 K wall interacts directly with the wall. This study first examines the statistics of the flame and flow key parameters, away from the walls and in the near-wall region. Then, several key parameters used in the geometric flame modelling framework are an..