Simulation of droplet impact on a curved solid surface by Lattice Boltzmann Method

In this paper, a two-phase multi-relaxation time lattice Boltzmann model is implemented to investigate droplet impact on a curved solid surface. The improved model is capable of simulating the phenomenon at low viscosities, different contact angles, and relatively high density ratios. Effects of varying the liquid viscosity and surface wettability are shown and discussed. For the impact on a hydrophilic surface, it was found that increasing the liquid viscosity slows down its spreading motion and the liquid shows more resistance to be stretched by the gravity force below the solid. In the case of droplet impact on a hydrophobic surface, secondary drops are separated from the spreading liquid before it even reaches the bottom of the surface.