Large eddy simulations of coal gasification in an entrained flow gasifier

► Multi-phase turbulent flow and coal gasification in an entrained flow gasifier is simulated using LES and RANS. ► LES captures unsteady flow structures in both combustion and gasification zones of the gasifier. ► Unsteady flow structures affect mixing and char-conversion efficiency. ► LES accurately predicts char-conversion efficiency compared to RANS.