Updated Hybrid Lattice-Boltzmann Model for Low-Mach Reactive Flows

International audienceA Lattice-Boltzmann model for low-Mach reactive flows is presented, built upon our recently published model (Comb & Flame, 196, 2018). The approach is hybrid and couples a Lattice-Boltzmann solver for the resolution of mass and momentum conservation and a finite difference solver for the energy conservation. Having lifted the constant thermodynamic and transport properties assumptions, the model presented now fully accounts for the classical reactive flow thermodynamic closure: each component is assigned NASA coefficients for calculating its thermodynamic properties. A temperature-dependent viscosity is considered, from which are deduced thermo-diffusive properties via specification of Prandtl and component-specific Schmidt numbers. Other major improvements from our previous contribution include the consideration of the pressure work in the energy equation, as well as detailed kinetics. Validation is carried out through simulation of the planar freely propagating flame and the growth of the associated Darrieus-Landau instability