Lattice Boltzmann simulations of immiscible drop collisions

Systems containing two or more fluid phases and one gas phase are of special practical interest. For example, in engines, compound droplets of oil and water can increase the effective burning rate. Despite the advancing of experimental techniques for managing ternary systems, accurate and flexible models that can predict complex interface dynamics with large density ratio are still lacking. Here I will introduce a versatile multiphase-multicomponent lattice Boltzmann scheme that allows density ratio of order 1000 between the gas and liquid phases. It combines the free energy approach, which ensures thermodynamic consistency and the entropic lattice Boltzmann algorithm, which strongly improves the simulation stability at high density ratios, and for high Weber and Reynold numbers. The novel ternary model can be exploited to study binary droplet collisions and wetting dynamics of droplets on liquid infused surfaces