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Lattice Boltzmann algorithm for continuum multicomponent flow.

I Halliday1, A P Hollis, C M Care

  • 1Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield, Howard Street, S1 1WB, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 13, 2007
PubMed
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This study introduces a multicomponent lattice Boltzmann simulation for fluid mechanics, enhancing component segregation. The method improves simulation performance by reducing interfacial microcurrents and enabling access to low capillary number flow regimes.

Area of Science:

  • Computational fluid dynamics
  • Multiphase flow simulation
  • Phase-field modeling

Background:

  • Continuum fluid mechanics simulations require accurate modeling of component segregation.
  • Existing lattice Boltzmann methods face challenges in handling interfacial dynamics and low capillary number flows.

Purpose of the Study:

  • To present a multicomponent lattice Boltzmann simulation with a focus on component segregation.
  • To analyze the dynamics of the phase field in a specific segregation method.
  • To demonstrate improvements in simulation performance for multicomponent flows.

Main Methods:

  • Multicomponent lattice Boltzmann simulation.
  • Implementation of a component segregation algorithm based on D'Ortona, Latva-Kokko, and Rothman.

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  • Coupling with Lishchuk's method for interface representation.

    • Main Results:

    • The component index (phase field) dynamics were derived for the segregation method.
    • The simulation effectively reduces interfacial microcurrent activity.
    • Access to flow regimes with low capillary and Reynolds numbers is facilitated.

    Conclusions:

    • The developed component segregation method enhances multicomponent flow simulations.
    • The method supports the concept of a sharp, unstructured continuum interface despite distributed component indices.
    • This approach offers improved performance and broader applicability in fluid mechanics simulations.