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

Advances in Aerodynamics 2022年第1期4卷 662-687页

作者： Zeren Yang Sha Liu Congshan Zhuo Chengwen Zhong School of Aeronautics Northwestern Polytechnical University127 West Youyi Road710072Xi’anChina National Key Laboratory of Science and Technology on Aerodynamic Design and Research Northwestern Polytechnical University127 West Youyi Road710072Xi’anChina

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

关键词： Pseudopotential model Discrete unified gas kinetic scheme Multiphase flows isotropic interface

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