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A hybrid lattice Boltzmann/finite-difference solver for low Machthermo-compressible flows developed in earlier works is extended to morerealistic and challenging configurations involving turbulence and complexgeometries in the present article. The major novelty here as compared toprevious contributions is the application of a more robust collision operator,considerably extending the stability of the original single relaxation timemodel and facilitating larger Reynolds number flow simulations. Additionally, asubgrid model and the thickened flame approach have also been added allowingfor efficient large eddy simulations of turbulent reactive flows in complexgeometries. This robust solver, in combination with appropriate treatment ofboundary conditions, is used to simulate combustion in two configurations:flame front propagation in a 2-D combustion chamber with several obstacles, andthe 3-D PRECCINSTA swirl burner. Time evolution of the flame surface in the 2-Dconfiguration shows very good agreement compared to direct numerical and largeeddy simulation results available in the literature. The simulation of thePRECCINSTA burner is first performed in the case of cold flow using twodifferent grid resolutions. Comparisons with experimental data reveal very goodagreement even at lower resolution. The model is then used, with a 2-stepchemistry and multi-component transport/thermodynamics, to simulate thecombustor at operating conditions similar to previously reportedexperimental/numerical studies for $\phi$=0.83. Results are again in very goodagreement compared with available large eddy simulation results as well asexperimental data, demonstrating the excellent performance of the hybridsolver.

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