约束流体的加权密度格子Boltzmann方法
Weighted density Lattice Boltzmann approach to fluids under confinement
摘要：
为了改进对输运系数的描述，重新考虑了最近为研究强非均匀流体而引入的类Enskog动力学方法。该方法是基于流体动力学和非流体动力学部分之间的相互作用的分离。后者是在一个简单的松弛近似处理。我们表明，通过考虑非流体动力学部分通过加权密度近似，我们得到了更好的预测的输运系数。由于动力学方程的简单性，我们能够通过格子玻尔兹曼方法数值求解存在非均匀性（例如限制表面）时的相空间分布。分析估计这些修正的重要性，在散装条件下的传输系数。本文研究了硬球流体在两平行光滑壁面间的Poillille流动，确定了它们的孔平均性质。
英文摘要：
The Enskog-like kinetic approach, recently introduced by us to study strongly inhomogeneous flu- ids, is reconsidered in order to improve the description of the transport coefficients. The approach is based on a separation of the interaction between hydrodynamic and non-hydrodynamic parts. The latter is treated within a simple relaxation approximation. We show that, by considering the non-hydrodynamic part via a weighted density approximation, we obtain a better prediction of the transport coefficients. By virtue of the simplicity of the kinetic equation we are able to solve numer- ically the phase space distribution in the presence of inhomogeneities, such as confining surfaces, via a Lattice Boltzmann method. Analytical estimates of the importance of these corrections to the transport coefficients in bulk conditions is provided. Poiseuille flow of the hard-sphere fluid confined between two parallel smooth walls is studied and their pore-averaged properties are determined.
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