Lattice Boltzmann modelling Knudsen layer effect in non-equilibrium flows
Lattice Boltzmann modelling Knudsen layer effect in non-equilibrium flows
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DOI：
10.1209/0295-5075/83/40008
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
G. Tang;Y. H. Zhang;X. Gu;D. Emerson
中科院分区：
文献类型：
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作者：
G. Tang;Y. H. Zhang;X. Gu;D. Emerson
由于其固有的动力学性质，格子玻尔兹曼（LB）方法来模拟非平衡气体流动最近吸引了显着的研究兴趣。与其他动力学方法相比，它可以提供一个显着较小的计算成本。为了捕捉气体流动中的非线性高阶稀疏现象，我们提出了一个与几何形状相关的气体局部平均自由程，并将其应用到我们的“高阶”LB模型中。对稀疏效应和Knudsen层干扰进行了一系列的试验，模拟结果表明我们的LB模型对高度非平衡流动的能力。
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.