Abstract
The lattice Boltzmann (LB) method has been used to simulate rarefied gas flows in micro-systems as an alternative tool, and shown its application possibility. For the rarefied gas flows, the surface roughness plays an important role for the slip phenomenon at the wall. If the wall surface is sufficiently rough, the reflection of the molecules will be diffuse and the tangential momentum accommodation coefficient (TMAC) is equal to unity. However, it has been known that the reflections are not always fully diffuse. In this study, rarefied gas flows are simulated in the slip and the transition flow regime including the effect of the TMAC. For the simulations, new non-fully diffuse wall boundary treatments of the LB method are proposed. The results of 2D and 3D simulations are in excellent agreement with the analytical solutions for the slip flow regime. The solutions of the linearized Boltzmann equation and DSMC for the transition flow regime are compared with those of high order LB method with present boundary conditions, and they are in excellent agreement. The tangential momentum accommodation coefficient effect is also investigated.
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Recommended by Associate Editor Joon Sang Lee
Namgyun Jeong received his B.S., M.S. and Ph.D. degrees from the Division of Mechanical Engineering of KAIST in 1999, 2001 and 2007, respectively. His research is focused on computational fluid dynamics. He is currently a senior researcher at Korea Atomic Energy Research Institute in Korea.
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Jeong, N. Rarefied gas flow simulations with TMAC in the slip and the transition flow regime using the lattice Boltzmann method. J Mech Sci Technol 28, 4705–4715 (2014). https://doi.org/10.1007/s12206-014-1037-y
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DOI: https://doi.org/10.1007/s12206-014-1037-y