A Lattice Boltzmann Approach for Thermal Microflows

Anas Selmi; Fedor Bukrev; Cristian Nagel; Mathias J Krause

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A Lattice Boltzmann Approach for Thermal Microflows

Abstract

Anas Selmi, Fedor Bukrev, Cristian Nagel and Mathias J Krause

Microflows are of interest due to the increase in its applications in small devices. The effects of higher Knudsen numbers are studied on rarefied flows in an isothermal case then a thermal case in three dimensions. Boundary conditions are coupled to get a model that describes the slip at higher Knudsen numbers (higher than 0.01) and to improve its convergence with respect to mesh refinements. Various ways to calculate the slip effect are introduced and compared. Lastly, a simple thermal flow is simulated with the same previous approach and verified with a modified analytical solution to prove the benefits of the proposed boundary

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