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Lattice Boltzmann algorithm for surface tension with greatly reduced microcurrents.

S V Lishchuk1, C M Care, I Halliday

  • 1Materials Research Institute, Sheffield Hallam University, Howard Street, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 12, 2003
PubMed
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We developed a new algorithm for multicomponent lattice Boltzmann fluids, improving interface physics. This method significantly reduces spurious velocities and enhances interface isotropy for static, neutrally buoyant drops.

Area of Science:

  • Computational fluid dynamics
  • Multiphase flow modeling
  • Lattice Boltzmann methods

Background:

  • Simulating immiscible fluids requires accurate interface representation.
  • Previous lattice Boltzmann methods often suffer from spurious velocities and poor interface isotropy.
  • Continuum physics principles are crucial for robust multiphase flow simulations.

Purpose of the Study:

  • To introduce a novel algorithm for interface insertion in multicomponent lattice Boltzmann fluids.
  • To ensure the algorithm is grounded in fundamental continuum physics principles.
  • To validate the algorithm's performance with static, neutrally buoyant drops.

Main Methods:

  • Developed an algorithm based on stress boundary conditions and velocity continuity.

Related Experiment Videos

  • Applied the algorithm to simulate static, neutrally buoyant drops in a multicomponent fluid.
  • Focused on accurately capturing the interface between immiscible fluid phases.

    • Main Results:

    • The algorithm successfully inserts interfaces between immiscible fluid phases.
    • Demonstrated a significant reduction in spurious velocities compared to prior schemes.
    • Achieved a notable improvement in the isotropy of the fluid interface.

    Conclusions:

    • The proposed algorithm offers a physically accurate approach to interface dynamics in lattice Boltzmann methods.
    • The reduction in spurious velocities and improved isotropy lead to more reliable multiphase flow simulations.
    • This method provides a foundation for more complex simulations of immiscible fluid systems.