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2D static droplet simulation with shan-chen multiphase lattice boltzmann model

Abstract:

This paper presents the assessment of the capability of Shan-Chen (SC) Multiphase Lattice Boltzmann Model (LBM) to accurately pbkp_redict the liquid-gas interface in multiphase flow. Multiphase flow can be found in various applications, as for example, in CO2 sequestration. One of the challenges for numerical models of such multiphase flows is being able to capture correctly the interface where liquid/gas phase transition happens. In this study, we analyse how parameters such as density ratio and temperature range affect the magnitude of unphysical velocity fields at the interface. The assessment of the model is performed by observing the change in unphysical velocity at the vicinity of the interface under input variations and as the result of domain discretization limits. Several static droplet tests were performed with different conditions of input variables using DL-MESO Lattice Boltzmann Equation (LBE). The SC model is found to present numerical instability for liquid-gas density ratios above 33 and at reduced temperature of below 0.67, and the magnitude of unphysical velocity also increases dramatically. The results of the assessment demonstrate the current limitations of SC LBM when used in the simulation of liquid/gas flows at moderate or low temperatures and high liquid-gas density ratios.