arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.09685physics.flu-dyn
收藏

内禀磁导率的格子Boltzmann模型

Lattice Boltzmann modelling of intrinsic permeability

Jun Li, Minh Tuan Ho, Lei Wu, Yonghao Zhang

摘要:

格子玻尔兹曼方法(LBM)被应用于预测包括固有渗透率在内的多孔介质的流动特性,其中隐含地假设LBM等价于不可压缩(或接近不可压缩)的纳维-斯托克斯方程。然而,在LBM模拟中,在纳维-斯托克斯方程中完全忽略的高阶矩仍然可以通过粒子分布函数获得。为了确保LBM模拟在Navier-Stokes流体动力学水平上正确工作,高阶矩必须可以忽略。这就要求Knudsen数(Kn)很小,从而可以忽略稀疏效应。在本技术说明中,我们详细阐述了多孔介质流动的LBM建模中的这个问题,这对于超致密介质中的气体流动特别重要。

英文摘要:

Lattice Boltzmann method (LBM) has been applied to predict flow properties of porous media including intrinsic permeability, where it is implicitly assumed that the LBM is equivalent to the incompressible (or near incompressible) Navier-Stokes equation. However, in LBM simulations, high-order moments, which are completely neglected in the Navier-Stokes equation, are still available through particle distribution functions. To ensure that the LBM simulation is correctly working at the Navier-Stokes hydrodynamic level, the high-order moments have to be negligible. This requires that the Knudsen number (Kn) is small so that rarefaction effect can be ignored. In this technical note, we elaborate this issue in LBM modelling of porous media flows, which is particularly important for gas flows in ultra-tight media.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑