Volume 83, Number 4, August 2008
|Number of page(s)||6|
|Published online||19 August 2008|
Lattice Boltzmann modelling Knudsen layer effect in non-equilibrium flows
Computational Science and Engineering Department, Daresbury Laboratory - Warrington, WA4 4AD, UK
2 Department of Mechanical Engineering, University of Strathclyde - Glasgow, G1 1XJ, UK
Accepted: 5 July 2008
Due to its intrinsically kinetic nature, lattice Boltzmann (LB) approach to simulating non-equilibrium gas flows has recently attracted significant research interest. Compared with other kinetic methods, it can offer a significantly smaller computational cost. To capture the nonlinear high-order rarefaction phenomena in gas flows, a geometry-dependent gas local mean free path has been proposed to be implemented in our “high-order" LB model. A series of tests on rarefaction effects and the Knudsen layer interference have been carried out and the simulation results demonstrate our LB model's capability for highly non-equilibrium flows.
PACS: 05.10.-a – Computational methods in statistical physics and nonlinear dynamics / 47.45.-n – Rarefied gas dynamics / 47.11.-j – Computational methods in fluid dynamics
© EPLA, 2008
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