Pseudopotential-based discrete unified gas kinetic scheme for modeling multiphase fluid flows

Abstract To directly incorporate the intermolecular interaction effects into discrete unified gas-kinetic scheme (DUGKS) for simulations of multiphase fluid flow, we developed a pseudopotential-based DUGKS by coupling pseudopotential model that mimics DUGKS. Due to flux reconstruction procedure, additional terms break isotropic requirements will be introduced. eliminate influences nonisotropic terms, expression equilibrium distribution functions is reformulated in moment-based form. With isotropy-preserving parameter appropriately tuned, can properly canceled out. The fundamental capabilities are validated flat interface test and quiescent droplet test. It has been proved proposed managed produce maintain interfaces. property transient conditions further confirmed spinodal decomposition. Stability superiority over lattice Boltzmann method also demonstrated predicting coexistence densities complying with van der Waals equation state. By incorporating interactions, offers mesoscopic perspective understanding behaviors, which could help gain fresh insights flow.