Abstract

Large-Eddy Simulations (LES) with first order Conditional Moment Closure (CMC) of a nitrogen-diluted hydrogen jet, igniting in a turbulent co-flowing hot air stream have been performed. A detailed kinetic mechanism (9 species, 19 reactions) is used. Our study covers the following aspects: CFD mesh resolution; CMC mesh resolution; inlet turbulence boundary conditions; modeling of the conditional scalar dissipation rate. In all studied cases, the hydrogen auto-ignites and a diffusion flame is formed. The influence of the terms in physical space in the CMC transport equations (convection and diffusion) is small.

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