Thermal multicomponent lattice Boltzmann model for catalytic reactive flows.

Area of Science:

• Computational fluid dynamics
• Chemical reaction engineering
• Thermodynamics

Background:

• Catalytic reactions are crucial for energy and environmental applications.
• Existing lattice Boltzmann models have limitations in simulating complex reactive flows.
• Accurate modeling of multispecies flows with catalysis is essential for process optimization.

Purpose of the Study:

• To extend a lattice Boltzmann model for simulating multispecies gas flows with catalytic reactions.
• To incorporate large temperature and concentration gradients within the model.
• To validate the model's performance against established numerical methods.

Main Methods:

• Adaptation of a previously developed lattice Boltzmann model for thermal binary-mixture gas flows.
• Inclusion of multispecies transport and surface catalytic reactions.
• Validation using a finite volume Navier-Stokes solver for channel-flow methane combustion.
• Adaptation of a catalytic boundary condition to account for temperature variations.

Main Results:

• The developed lattice Boltzmann model successfully simulates multispecies flows with catalytic reactions.
• The model accurately handles significant temperature and concentration gradients.
• Validation against a Navier-Stokes solver confirms the model's accuracy in methane catalytic combustion.
• Speed of sound simulations demonstrate the model's physical integrity.

Conclusions:

• The extended lattice Boltzmann model provides a robust tool for simulating complex catalytic reactions in multispecies flows.
• The model's ability to handle thermal effects and large gradients enhances its applicability.
• This work contributes to the advancement of computational methods for chemical engineering processes.