A unified lattice Boltzmann model and application to multiphase flows

In this work, we develop a unified lattice Boltzmann model (ULBM) framework that can seamlessly integrate the widely used collision operators, including Bhatnagar–Gross–Krook or single-relation-time, multiple-relaxation-time, central-moment cascaded method and multiple entropic operators (KBC). Such clarifies relations among existing greatly facilitates comparison development as well coding. Importantly, any LB treatment constructed for specific operator could be easily adopted by other operators. We demonstrate flexibility power of ULBM through three multiphase flow problems: rheology an emulsion, splashing droplet on liquid film dynamics pool boiling. Further exploration wide variety phenomena would both realistic beneficial, making LBM more accessible to non-specialists. This article is part theme issue ‘Progress in mesoscale methods fluid simulation’.