A lattice Boltzmann method for axisymmetric multicomponent flows with high viscosity ratio

Haihu Liu, Lei Wu, Yan Ba, Guang Xi, Yonghao Zhang

Research output: Contribution to journalArticle

18 Citations (Scopus)
86 Downloads (Pure)

Abstract

A color-gradient lattice Boltzmann method (LBM) is proposed to simulate ax- isymmetric multicomponent flows. This method uses a collision operator that is a combination of three separate parts, namely single-component collision op- erator, perturbation operator, and recoloring operator. A source term is added into the single-component collision operator such that in each single-component region the axisymmetric continuity and momentum equations can be exactly re- covered. The interfacial tension effect is realized by the perturbation operator, in which an interfacial force of axisymmetric form is derived using the concept of continuum surface force. A recoloring operator proposed by Latva-Kokko and Rothman is extended to the axisymmetric case for phase segregation and maintenance of the interface. To enhance the method’s numerical stability for handling binary fluids with high viscosity ratio, a multiple-relaxation-time mod- el is used for the collision operator. Several numerical examples, including static droplet test, oscillation of a viscous droplet, and breakup of a liquid thread, are presented to test the capability and accuracy of the proposed color-gradient LB- M. It is found that the present method is able to accurately capture the phase interface and produce low spurious velocities. Also, the LBM results are all in good agreement with the analytical solutions and/or available experimental data for a very broad range of viscosity ratios.
Original languageEnglish
JournalJournal of Computational Physics
Early online date6 Oct 2016
DOIs
Publication statusE-pub ahead of print - 6 Oct 2016

Keywords

  • lattice Boltzmann method
  • axisymmetric flow
  • color-gradient model
  • high viscosity ratio
  • Rayleigh instability
  • collision operator
  • single-component collision operator
  • perturbation operator
  • recolouring operator
  • interfacial tension
  • binary fluids
  • high-viscosity ratio
  • multiple-relaxation model

Fingerprint Dive into the research topics of 'A lattice Boltzmann method for axisymmetric multicomponent flows with high viscosity ratio'. Together they form a unique fingerprint.

  • Projects

    Cite this