Wetting boundary conditions for multicomponent pseudopotential lattice Boltzmann

The implementation of boundary conditions is among the most challenging parts of modeling fluid flow through channels and complex media. Here, we show that the existing methods to deal with liquid-wall interactions using multicomponent Lattice Boltzmann are accurate when the wall is aligned with the main axes of the lattice but fail otherwise. To solve this problem, we extend a strategy previously developed for multiphase models. As an example, we study the coalescence of two droplets on a curved surface in two dimensions. The strategy proposed here is of special relevance for binary flows in complex geometries.

Automated summary

The implementation of boundary conditions in modeling fluid flow is challenging, particularly in dealing with liquid-wall interactions. Existing methods using multicomponent Lattice Boltzmann are accurate when the wall is aligned with the main axes of the lattice but fail otherwise. To address this issue, a strategy developed for multiphase models is extended, with particular relevance for binary flows in complex geometries.