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In this paper, we aim to investigate the implementation of contact angles inthe pseudopotential lattice Boltzmann modeling of wetting at a large densityratio. The pseudopotential lattice Boltzmann model [X. Shan and H. Chen, Phys.Rev. E 49, 2941 (1994)] is a popular mesoscopic model for simulating multiphaseflows and interfacial dynamics. In this model, the contact angle is usuallyrealized by a fluid-solid interaction. Two widely used fluid-solidinteractions: the density-based interaction and the pseudopotential-basedinteraction, as well as a modified pseudopotential-based interaction formulatedin the present paper, are numerically investigated and compared in terms of theachievable contact angles, the maximum and the minimum densities, and thespurious currents. It is found that the pseudopotential-based interaction workswell for simulating small static (liquid) contact angles, however, is unable toreproduce static contact angles close to 180 degrees. Meanwhile, it is foundthat the proposed modified pseudopotential-based interaction performs better inlight of the maximum and the minimum densities and is overall more suitable forsimulating large contact angles as compared with the other two types offluid-solid interactions. Furthermore, the spurious currents are found to beenlarged when the fluid-solid interaction force is introduced. Increasing thekinematic viscosity ratio between the vapor and liquid phases is shown to becapable of reducing the spurious currents caused by the fluid-solidinteractions.

Contact angles in the pseudopotential lattice Boltzmann modeling of wetting