Large-eddy simulation of H₂–air auto-ignition using tabulated detailed chemistry

Abstract

Large-eddy simulation (LES) of an igniting turbulent hydrogen/air jet for which experimental data are available is reported. A sub-grid scale closure is proposed that is based on a tabulation of detailed chemistry combined with a presumed probability density function, to be implemented into a fully compressible LES solver. The simulations are performed in a frame moving with the mean flow. The obtained results are shown to reproduce the experimental findings in terms of ignition length. A dynamic closure is used for the unknown sub-grid scale (SGS) scalar dissipation rate of mixture fraction and the sensitivity of the chemical response to SGS modelling is studied.