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为研究多孔介质内振荡流流动特性,该文将格子-Boltzmann方法对多孔介质内的振荡流过程进行了数值研究。采用四参数方法构造了多孔介质结构模型,对多孔介质内的振荡流过程的模拟结果表明:多孔介质振荡流的最大压差随最大Renoylds数的增加而迅速增加,在Renoylds数小于100的范围内,最大阻力系数与最大Renoylds数呈反比例关系,与文献报道的实验结果一致;在孔隙率小于0.85范围内,压差与流速之间的相位差变化较小,孔隙率继续增加时,相位差随孔隙率的增加而线性降低。
In order to study the flow characteristics of oscillatory flow in porous media, the lattice-Boltzmann method is used to study the oscillatory flow in porous media. The four-parameter method was used to construct the porous media model. The simulation results of the oscillatory flow in porous media show that the maximum pressure drop of the oscillating flow in porous media increases rapidly with the increase of the maximum Renoylds number. When the Renoylds number is less than 100 , The maximum drag coefficient is inversely proportional to the maximum Renoylds number, which is consistent with the experimental results reported in the literature. When the porosity is less than 0.85, the phase difference between the pressure drop and the flow rate is small. When the porosity continues to increase, the phase difference Porosity increases linearly and decreases.