Numerical simulation of three-component multiphase flows at high density and viscosity ratios using lattice Boltzmann...

Area of Science:

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

Background:

• Accurate simulation of multiphase flows with high density and viscosity ratios is challenging.
• Existing models often suffer from spurious velocities and interface tracking issues.
• Phase-field and lattice Boltzmann methods offer potential solutions but require careful integration.

Purpose of the Study:

• To propose a novel multiphase lattice Boltzmann model for ternary fluid systems.
• To achieve numerical simulations free from spurious velocities.
• To accurately track interfaces in complex multiphase scenarios.

Main Methods:

• Utilizing a phase-field approach based on Cahn-Hilliard theory.
• Employing the lattice Boltzmann method for fluid dynamics simulation.
• Implementing a multiphase model for three distinct fluid components.

Main Results:

• The model successfully simulates ternary flows with high density and viscosity ratios.
• Benchmarks including droplet spreading and collision demonstrate model accuracy.
• Parasitic currents are reduced to machine precision levels.

Conclusions:

• The proposed multiphase lattice Boltzmann model is reliable for ternary fluid simulations.
• The model effectively handles complex interface dynamics.
• This approach offers a robust solution for high-fidelity multiphase flow computations.