Improved three-dimensional thermal multiphase lattice Boltzmann model for liquid-vapor phase change

Area of Science:

• Computational Fluid Dynamics
• Thermodynamics
• Phase Change Phenomena

Background:

• Lattice Boltzmann (LB) methods are increasingly used for modeling liquid-vapor phase change.
• Existing thermal LB models face challenges with boundary conditions and lattice limitations.

Purpose of the Study:

• To propose an improved three-dimensional thermal multiphase LB model for liquid-vapor phase change simulation.
• To enhance the accuracy and computational efficiency of existing LB models.

Main Methods:

• Developed a thermal LB model incorporating a temperature distribution function.
• Implemented local calculations for gradient terms (∇·u and ∇T), eliminating boundary node issues.
• Constructed the thermal LB equation on a D3Q7 lattice, simplifying the model and improving efficiency.

Main Results:

• The proposed model retains the advantages of the thermal LB method.
• Local calculation of gradient terms simplifies boundary treatments.
• Elimination of a specific error term allows for a simpler D3Q7 lattice, enhancing computational efficiency.

Conclusions:

• The improved 3D thermal multiphase LB model accurately and efficiently simulates liquid-vapor phase change.
• The model offers a simplified and more computationally efficient approach compared to existing methods.
• The use of the D3Q7 lattice contributes to improved performance.