In the original fracture model with the high-frequency secondary roughness, our results show that fluid flow fields are not only generally non-linear, but also with non-stop generation and motions of eddies in the boundary layer regions of rough fractures when the Re=1000 in this study, which will affect the solute transport processes in fractured rock masses. The results obtained from the experiments show that coal measure rocks show significant change in post-failure behavior when the control modes were changed from axial strain to lateral strain. Secondly, the fractal-like tree fracture network is used to represent the distribution of complex fracture networks, and then flow rate in a tortuous fractal-like tree fracture network is derived. Fracture and matrix elements share the same nodes. When NB−1 is smaller than 3.57, the relative error of the imbibition height in a single fracture ηLs will be larger than 10%. The volume fractal dimension can be used to quantitatively define the complexity of pores. In this study, the influence of real coal macropore structure on the fluid flow through coal was studied through 3-D coal structure reconstruction by the CT images. Unlimited viewing of the article PDF and any associated supplements and figures. Percolation refers to the bending of roads and the cracking of trees with the presence of two conditions, sunlight and under the influence of pressure. Small Bodies, Solar Systems Statistical mechanics of unsaturated porous media. and you may need to create a new Wiley Online Library account. (Unknown date). 814-821, Relationship between percolation–fractal properties and permeability of 2-D fracture networks. This figure shows no significant difference during the falling head permeability test, i.e. Regarding the mesh discretisation for finite element analysis, the rock matrix is discretised into three-dimensional (3D) solid elements, whereas the discrete fractures are modelled by zero-thickness elements. In core-scale fractured porous media, the relative error of the total imbibition weight ηM is larger than 10% when NBC−1 is smaller than 8.8. (1896-1977), Chinese Journal of Geophysics (2000-2018), International This paper proposes a new permeability model for 2D complex tortuous fractured porous media based on fractal theory, and two important characteristics of fractures, i.e. We use cookies to help provide and enhance our service and tailor content and ads. The average outlet flow rate of the percolation network under the same fracture density is much larger than that of the nonpercolation fracture network, which results in a more rapid decrease in the outlet temperature. To validate the methodology introduced and the equations, a set of new fracture patterns with different random realizations were considered. First attempts on modeling fracture networks were on lattice networks [11]. Numerical Simulation of Groundwater Flow Using Stable Isotopes of Oxygen and Hydrogen as Natural Tracers. This term is obtained using the relationships with the properties of fracture networks mentioned above. Results demonstrate both Forchheimer and Izbash equations can capture the nonlinear flow behavior. The most important characteristic of the continuum percolation is an appropriate density parameter equivalent to occupancy probability in the lattice percolation [12]. Rain gardens, sometimes called bio-retention areas, are shallow depressions in the landscape that capture stormwater and allow it to gradually percolate into the soil. Center for Urban Water Resources Management, Department of Civil Engineering, University of Washington. The outcome of this study helps to understand the structure-based flow characterization and gas transport behavior in heterogenous coal which will have the implication of the gas extraction from coalbed methane reservoirs and coal mine gas drainage.