Using Digital Imaging to Characterize Threshold Dynamic Parameters in Porous Media Based on Lattice Boltzmann Method
Using Digital Imaging to Characterize Threshold Dynamic Parameters in Porous Media Based on Lattice Boltzmann Method
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DOI：
10.1088/0256-307x/21/12/037
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发表时间：
2004-12
影响因子：
3.5
通讯作者：
Xu You-Sheng-;Xu You-Sheng-;Liu Yang;Huang Guo-xiang
中科院分区：
文献类型：
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作者：
Xu You-Sheng-;Xu You-Sheng-;Liu Yang;Huang Guo-xiang
采用数字图像（DI）和格子玻尔兹曼方法（LBM）来表征多孔介质的阈值动态参数。多孔结构的二维表示是通过对一系列微小样品获得的数字图像进行分割来重建的。利用LBM研究了7个测试样品的阈值压力梯度和阈值佩克莱特数。数值结果与整合达西定律得到的结果一致。结果还表明，只有当流体力足够大以克服多孔介质中的阈值压力梯度时，流体才能流过多孔介质。使用一个综合案例来进一步说明所提出技术的适用性。此外，我们模型中的动态规则是局部的，因此它可以在并行计算机上运行，具有良好的计算效率。
Digital images (DI) and lattice Boltzmann method (LBM) are used to characterize the threshold dynamic parameters of porous media. Two-dimensional representations of the porous structure are reconstructed from segmentation of digital images obtained from a series of tiny samples. The threshold pressure gradients and threshold Peclet numbers are researched on seven test samples by using LBM. Numerical results are in agreement with that obtained by integrating Darcy's law. The results also indicate that fluids can flow through porous media only if the fluid force is large enough to overcome threshold pressure gradient in porous media. One synthetic case is used to further illustrate the applicability of the proposed technique. In addition, the dynamical rules in our model are local, therefore it can be run on parallel computers with well computational efficiency.