Kinetic theory representation of hydrodynamics: A way beyond the Navier-Stokes equation

Xiaowen Shan, Xue Feng Yuan, Hudong Chen

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We present in detail a theoretical framework for representing hydrodynamic systems through a systematic discretization of the Boltzmann kinetic equation. The work is an extension of a previously proposed formulation. Conventional lattice Boltzmann models can be shown to be directly derivable from this systematic approach. Furthermore, we provide here a clear and rigorous procedure for obtaining higher-order approximations to the continuum Boltzmann equation. The resulting macroscopic moment equations at each level of the systematic discretization give rise to the Navier-Stokes hydrodynamics and those beyond. In addition, theoretical indications to the order of accuracy requirements are given for each discrete approximation, for thermohydrodynamic systems, and for fluid systems involving long-range interactions. All these are important for complex and micro-scale flows and are missing in the conventional Navier-Stokes order descriptions. The resulting discrete Boltzmann models are based on a kinetic representation of the fluid dynamics, hence the drawbacks in conventional higher-order hydrodynamic formulations can be avoided. © 2006 Cambridge University Press.
    Original languageEnglish
    Pages (from-to)413-441
    Number of pages28
    JournalJournal of Fluid Mechanics
    Volume550
    DOIs
    Publication statusPublished - Mar 2006

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