Three Dimensional Microscopic Flow Simulation Across the Interface of a Porous Wall and Clear Fluid by the Lattice Boltzmann Method
Three Dimensional Microscopic Flow Simulation Across the Interface of a Porous Wall and Clear Fluid by the Lattice Boltzmann Method
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DOI：
10.2174/1877729500901010035
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发表时间：
2009-10
期刊：
影响因子：
--
通讯作者：
K. Suga;Y. Nishio
中科院分区：
文献类型：
--
作者：
K. Suga;Y. Nishio
讨论了多孔介质对高度多孔壁和透明流体之间的界面区域中的流动的影响。通过格子玻尔兹曼方法对泡沫多孔壁界面区域的三维层流进行了微观模拟。所选择的多孔结构为体心立方或单位立方结构，其孔隙率范围为0.82-0.98。界面区域的速度分布表明，渗入多孔层的流动非常小，并且在距界面一孔径深度处衰减。为了描述独立于多孔结构的滑移速度分布，渗透率雷诺数和摩擦速度被确认为代表性尺度参数。还通过模拟结果检查了界面上的应力跳跃条件。尽管获得的多孔界面的平均壁摩擦力略低于固体光滑不渗透表面的平均壁摩擦力，但由于界面流动运动的统计平均所产生的雷诺应力，降低并不显着。
The effects of the porous medium on the flow in the interface region between a highly porous wall and clear fluid are discussed. Three dimensional laminar flows in the interface regions of foamed porous walls are microscopically simulated by the lattice Boltzmann method. The chosen porous structure is the body-centered-cubic or the unit cube structure whose porosity ranges 0.82-0.98. The velocity distribution in the interface regions show that the flow penetration into porous layer is very little and it decays until one pore-diameter depth from the interface. To describe the slip velocity distribution independently of the porous structure, the permeability Reynolds number and the friction velocity are confirmed to be representative scale parameters. The stress jump conditions across the interface are also examined with the simulation results. Although the obtained averaged wall friction of the porous interface is slightly lower than that of the solid smooth impermeable surface, the reduction is not significant due to the Reynolds stress arisen from the statistical averaging of the interfacial flow motions.