Low Mach number lattice Boltzmann model for turbulent combustion: Flow in confined geometries

A hybrid lattice Boltzmann/finite-difference solver for low Mach thermo-compressible flows developed in earlier works is extended to more realistic and challenging configurations involving turbulence complex geometries the present article. The major novelty here as compared previous contributions application of a robust collision operator, considerably extending stability original single relaxation time model facilitating larger Reynolds number flow simulations. Additionally, subgrid thickened flame approach have also been added allowing efficient large eddy simulations turbulent reactive geometries. This solver, combination with appropriate treatment boundary conditions, used simulate combustion two configurations: front propagation 2-D chamber several obstacles, 3-D PRECCINSTA swirl burner. Time evolution surface configuration shows very good agreement direct numerical simulation results available literature. burner first performed case cold using different grid resolutions. Comparisons experimental data reveal even at lower resolution. then used, 2-step chemistry multi-component transport/thermodynamics, combustor operating conditions similar previously reported experimental/numerical studies ?=0.83. Results are again well data, demonstrating excellent performance solver.