Lattice Boltzmann simulation of the effect for adding a ghost fluid layer on the simulation accuracy of a sessile droplet on a heated surface

Abstract

For the study of sessile droplets evaporating on heated (non-isothermal) walls by the single-component Lattice Boltzmann method, it is necessary to apply a ghost fluid layer near the border to calculate the adhesive force between the liquid particles and the solid wall. In this paper, we apply three commonly used fluid-solid interaction schemes, combined with four methods for constructing ghost fluid layers, and specifically investigate the effects of using different combinations of schemes on the results of maximum spurious velocity and near-wall fluid density deviation of heated droplets, respectively. Finally, the most suitable schemes was found in the normal range contact angle, hydrophobic contact angle, and more hydrophilic contact angle. And the reasons why some contact angle schemes can't be realized are analyzed. In addition, the temperature and velocity fields of the heated droplet formed under different schemes were analyzed, and the conclusions are in agreement with the previous theoretical analysis.