Three-dimensional double-rough-walled modeling of fluid flow through self-affine shear fractures
Three-dimensional double-rough-walled modeling of fluid flow through self-affine shear fractures
复制标题
自仿射剪切裂缝流体流动的三维双粗糙壁建模
DOI：
10.1016/j.jrmge.2019.09.002
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发表时间：
2020-02
影响因子：
7.3
通讯作者：
Liyuan Yu
中科院分区：
文献类型：
--
作者：
Richeng Liu;Ming He;Na Huang;Yujing Jiang;Liyuan Yu
本研究提出一种双粗糙壁裂缝模型来表示粗糙裂缝的自然几何形状。粗糙表面的生成使用修改的连续随机添加（SRA）算法和剪切过程中的孔径分布计算使用的机械模型。剪切流模拟通过直接求解Navier-Stokes（NS）方程来进行。结果表明，双粗糙壁裂缝模型与常用的单粗糙壁裂缝模型相比，可以提高流体流动模拟的精度约14.99%~ 19.77%。当剪切位移从2.2 mm增加到2.6 mm时，线性流态下的流体流量与水力梯度之比增加一个数量级。通过求解NS方程，考虑了惯性效应，模拟了常规实验中不易捕捉到的显著涡并进行了数值可视化。剪切过程中的线性制度的流体流动的各向异性是强大的增强作为剪切的进步，然而，它是增加或减少的流体在非线性流动制度，这取决于剪切诱导的空隙空间的几何形状之间的两个粗糙的壁的裂缝。本研究提供了一种方法来表示真实的几何形状的裂缝在剪切和模拟流体流动，通过直接求解NS方程，这可以潜在地利用在许多应用中，如热量和质量传递，污染物传输，耦合水热力学过程中的岩石裂缝/裂缝网络。
This study proposes a double-rough-walled fracture model to represent the natural geometries of rough fractures. The rough surface is generated using a modified successive random additions (SRA) algorithm and the aperture distribution during shearing is calculated using a mechanistic model. The shear-flow simulations are performed by directly solving the Navier-Stokes (NS) equations. The results show that the double-rough-walled fracture model can improve the accuracy of fluid flow simulations by approximately 14.99%–19.77%, compared with the commonly used single-rough-walled fracture model. The ratio of flow rate to hydraulic gradient increases by one order of magnitude for fluids in a linear flow regime with increment of shear displacement from 2.2 mm to 2.6 mm. By solving the NS equations, the inertial effect is taken into account and the significant eddies are simulated and numerically visualized, which are not easy to be captured in conventional experiments. The anisotropy of fluid flow in the linear regime during shearing is robustly enhanced as the shearing advances; however, it is either increased or decreased for fluids in the nonlinear flow regime, depending on the geometry of shear-induced void spaces between the two rough walls of the fracture. The present study provides a method to represent the real geometry of fractures during shearing and to simulate fluid flow by directly solving the NS equations, which can be potentially utilized in many applications such as heat and mass transfer, contaminant transport, and coupled hydro-thermo-mechanical processes within rock fractures/fracture networks.
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DOI：
10.1016/j.ijrmms.2005.12.001
发表时间：
2006-07
影响因子：
7.2
作者：
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通讯作者：
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影响因子：
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发表时间：
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影响因子：
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DOI：
10.1016/j.ijrmms.2011.09.009
发表时间：
2011-12
影响因子：
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作者：
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影响因子：
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