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Lattice Boltzmann model for thermal binary-mixture gas flows.
Jinfen Kang1, Nikolaos I Prasianakis, John Mantzaras
1Combustion Research Laboratory, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland. jinfen.kang@psi.ch
Summary
A new lattice Boltzmann model simulates thermal gas mixtures by combining existing thermal and multicomponent models. This platform enables studying complex flows with significant temperature variations and adjustable properties.
Area of Science:
- Computational Fluid Dynamics
- Thermodynamics
- Chemical Engineering
Background:
- Existing lattice Boltzmann models often lack the capability to handle both thermal effects and multicomponent mixtures simultaneously.
- Simulating flows with large temperature gradients in mixtures requires integrated models for accurate predictions.
Purpose of the Study:
- To develop a unified lattice Boltzmann model for simulating thermal gas mixtures.
- To create a versatile platform for analyzing complex multicomponent flows with significant temperature differences.
Main Methods:
- Derived a kinetic model by integrating features of single-component thermal and multicomponent isothermal models.
- Incorporated mass, momentum, energy conservation, and multicomponent diffusion equations.
- Developed a model capable of simulating mixtures with adjustable Prandtl and Schmidt numbers.
Main Results:
- Successfully constructed a comprehensive platform for studying multicomponent mixture flows with large temperature differences.
- Validated the model in various flow configurations, demonstrating its accuracy with temperature and species concentration ratios up to nine.
Conclusions:
- The developed lattice Boltzmann model provides a robust framework for simulating complex thermal gas mixtures.
- The platform offers flexibility for studying diverse practical applications involving non-isothermal multicomponent flows.
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