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Lattice Boltzmann model for immiscible three-phase flows with phase change
Guang Yang1, Hangyu Chen1, Moran Wang1
1Tsinghua University, Department of Engineering Mechanics and ASP, Beijing 100084, China.
Physical Review. E
|August 1, 2025
Summary
This study introduces a novel lattice Boltzmann (LB) model for immiscible multiphase flow with phase change. The model captures spontaneous phase transitions, crucial for understanding fluid dynamics in porous media.
Area of Science:
- Computational Fluid Dynamics
- Multiphase Flow Physics
- Thermodynamics
Background:
- Simulating immiscible multiphase flow with phase change is computationally challenging.
- Existing models often neglect the critical role of phase transitions.
Purpose of the Study:
- To develop a unified lattice Boltzmann (LB) model for immiscible multiphase flow with spontaneous phase change.
- To investigate the impact of phase change on fluid displacement in porous media.
Main Methods:
- Integration of the pseudopotential model and color-gradient model for LB simulations.
- Validation through multiple benchmark cases.
- Application to analyze phase change effects in porous media.
Main Results:
- The LB model successfully captures spontaneous phase change in immiscible flows.
- Phase change significantly influences gas blockage effects and compressibility during displacement.
- Simulations reveal distinct mechanisms influenced by capillary numbers.
Conclusions:
- The developed LB model provides a robust framework for simulating complex multiphase flows with phase change.
- Accounting for phase transitions is essential for accurate modeling of fluid dynamics in porous media.
- This work highlights the critical importance of phase change in immiscible multiphase flow systems.
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