A unified lattice Boltzmann model and application to multiphase flows. (18th October 2021)

• Record Type: Journal Article
• Authors: Luo, Kai H.; Fei, Linlin; Wang, Geng
• Is Part Of: Philosophical transactions. Volume 379:Number 2208(2021)
• Publication Date: 2021-10-18
• Subjects: lattice Boltzmann model -- mesoscale modelling -- multiphase flow -- thermal flow -- phase change; Physical sciences -- Periodicals; Engineering -- Periodicals; Mathematics -- Periodicals; 500
• DOI: 10.1098/rsta.2020.0397
• Languages: English
• ISSNs: 1364-503X

Abstract

Abstract : In this work, we develop a unified lattice Boltzmann model (ULBM) framework that can seamlessly integrate the widely used lattice Boltzmann collision operators, including the Bhatnagar–Gross–Krook or single-relation-time, multiple-relaxation-time, central-moment or cascaded lattice Boltzmann method and multiple entropic operators (KBC). Such a framework clarifies the relations among the existing collision operators and greatly facilitates model comparison and development as well as coding. Importantly, any LB model or treatment constructed for a specific collision operator could be easily adopted by other operators. We demonstrate the flexibility and power of the ULBM framework through three multiphase flow problems: the rheology of an emulsion, splashing of a droplet on a liquid film and dynamics of pool boiling. Further exploration of ULBM for a wide variety of phenomena would be both realistic and beneficial, making the LBM more accessible to non-specialists. This article is part of the theme issue 'Progress in mesoscale methods for fluid dynamics simulation'.