Investigation of Density Ratio Effects on Performance of the Pseudo-Potential Model in Multiphase Flows Simulation

In this research, the performance and capability of the developed pseudo-potential Shan- Chen model for the simulation of multiphase flows with large density ratios are evaluated. This model is applied in the Palabos open source software which simulates fluid flows by means of the Lattice Boltzmann method. For this reason, some well-known multiphase benchmarks are investigated such as the Laplace law, the segregation, the bubbles coalescence and the droplet impact with solid and liquid surfaces. According to the Laplace law, this model is capable of determining a wide range of surface tensions in different density ratios. In addition, this model is able to predict the interface shape and phase segregation automatically very well. However convergence rate is reduced as the density ratio increases. The simulation of two bubbles coalescence reveals that large spurious current and large interface oscillation are the two main drawbacks of the pseudo-potential model. In the droplet impact with a solid surface simulation, the effects of density ratio which leads to a difference in the surface tension and the Weber number are considered. When the Weber number is increased, the maximum spread increases but its vacillation decreases. Ultimately, the results of the splash process show that the Weber number has a remarkable influence on the breaking of a part of the crown layer.