A computed scanning technology was applied to measure fracture tomography, and three-dimensional fracture meshes were established. Water flow experiments and simulations on fractures were conducted. Results demonstrate both Forchheimer and Izbash equations can capture the nonlinear flow behavior. As Reynolds number increases, contact obstacles and roughness of fracture increase the complexity of the velocity distribution by generating eddies or back flow. Nonlinear coefficient in Forchheimer equation increases by 1-5 orders of magnitude, ranging from 6 x 10(10 )to 5 x 10(15). A critical Reynolds number is proposed to quantify the onset of nonlinear flow. Further quantitative analysis is conducted regarding flow path tortuosity.
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机译：应用计算机扫描技术对断层扫描进行测量，建立三维断口网格。进行了裂缝的水流实验和模拟。结果表明，Forchheimer和Izbash方程均可捕获非线性流动行为。随着雷诺数的增加，接触障碍和裂缝的粗糙度通过产生涡流或回流增加了速度分布的复杂性。 Forchheimer方程中的非线性系数增加1-5个数量级，范围从6 x 10（10）到5 x 10（15）。提出了一个临界雷诺数以量化非线性流动的开始。关于流路曲折性进行了进一步的定量分析。
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