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

Liu, Haihu and Wu, Lei and Ba, Yan and Xi, Guang and Zhang, Yonghao (2016) A lattice Boltzmann method for axisymmetric multicomponent flows with high viscosity ratio. Journal of Computational Physics. ISSN 0021-9991

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    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.

    Author(s):Liu, Haihu, Wu, Lei ORCID logoORCID: https://orcid.org/0000-0002-6435-5041, Ba, Yan, Xi, Guang and Zhang, Yonghao ORCID logoORCID: https://orcid.org/0000-0002-0683-7050
    Item type:Article
    ID code:58099
    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, Mechanical engineering and machinery, Mechanical Engineering
    Subjects:Technology > Mechanical engineering and machinery
    Department:Faculty of Engineering > Mechanical and Aerospace Engineering
    Technology and Innovation Centre > Advanced Engineering and Manufacturing
    Depositing user: Pure Administrator
    Date deposited:10 Oct 2016 08:32
    Last modified:12 Feb 2020 04:15
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/58099
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