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Lattice-Boltzmann algorithm for simulating thermal two-phase flow

Palmer1, Rector

  • 1Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|October 14, 2000
PubMed
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This study introduces a new algorithm for lattice-Boltzmann simulations, enhancing two-phase flow analysis with thermal effects. The improved model accurately captures thermal phenomena in nonideal systems, validated by simulations of liquid film and droplet evaporation.

Area of Science:

  • Computational fluid dynamics
  • Thermodynamics
  • Multiphase flow

Background:

  • Lattice-Boltzmann methods are widely used for fluid flow simulations.
  • Incorporating thermal effects into two-phase flow simulations presents significant challenges.
  • Existing models for thermal flow and two-phase flow have limitations.

Purpose of the Study:

  • To develop and validate a novel algorithm for lattice-Boltzmann simulations of two-phase flow with thermal effects.
  • To address discrepancies in previous thermal flow models for nonideal systems.
  • To provide a more accurate simulation tool for phenomena like evaporation and condensation.

Main Methods:

  • Combining a two-distribution model for single-phase thermal flow with a thermodynamically-based model for isothermal two-phase flow.

Related Experiment Videos

  • Correcting the thermal energy flux description from internal energy gradient to temperature gradient.
  • Implementing and testing the algorithm on various benchmark problems.

    • Main Results:

    • The algorithm successfully incorporates thermal effects into lattice-Boltzmann simulations of two-phase flow.
    • Simulations accurately reproduced phenomena such as free-standing liquid film formation, film evaporation, droplet evaporation, and channel condensation.
    • The corrected thermal energy flux model showed improved accuracy for nonideal systems compared to classical hydrodynamics.

    Conclusions:

    • The developed algorithm provides a robust and accurate method for simulating thermal two-phase flow.
    • This advancement is crucial for understanding and predicting complex fluid dynamics phenomena involving heat transfer.
    • The corrected model offers a systematic improvement over previous approaches for nonideal fluid systems.