气候变化领域集成服务门户(CCPortal): Validity of triple-effect model for fluid flow in mismatched, self-affine fractures

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DOI	10.1016/j.advwatres.2020.103585
	Validity of triple-effect model for fluid flow in mismatched, self-affine fractures
	Zheng J.; Jin Y.; Liu X.; Wang C.; Liu X.
发表日期	2020
ISSN	0309-1708
卷号	140
英文摘要	Investigation of seepage law of fluid flow through a self-affine, rough fracture has attracted broad attention because of its fundamental importance for complex hydrodynamic problems. Although it is natural to assume that permeability value depends on aperture size, it is hard to determine which is the appropriate relationship between them because of the large number of parameters related to the multi-scale geometries and mismatched behaviors in internal surfaces. Moreover, those parameters are hard to obtain by field observation or laboratory tests. For these, we focused on synthesising mismatched composite topography of natural fractures and numerical simulation of fluid flow through them at pore scale. Firstly, the control mechanism of self-affine property was clarified, and a novel Weierstrass-Mandelbrot (W-M) function was proposed to model self-affine profile as per fractal topography theory. Afterwards, a weighting algorithm was developed to construct the composite topography of fractures accounting for the mismatched behavior. Finally, the effects of mismatched behavior, hydraulic and surface tortuosities on fracture flow were systematically analyzed by numerical simulations using Lattice Boltzmann methods (LBM) at pore scale. Our investigation indicates that the aperture distribution is dominated by the mismatched range between internal surfaces, however the hydraulic and surface tortuosity effects are approximately scaled by 2(H−1) (H is the Hurst exponent) with the mean aperture despite of its distribution. Moreover, it was found that the local surface roughness factor, accounting for effects from surface geometries with size smaller than the value of mean aperture, is stationary at long range and inversely proportional to fracture permeability. Based on above discussions, the validity of triple-effect model for permeability prediction of mismatched self-affine fractures was established. © 2020 Elsevier Ltd
关键词	Fracture Numerical methods Numerical models Surface roughness Topography Aperture distribution Fracture permeability Hydrodynamic problems Lattice boltzmann methods (LBM)Mis-matched composites Permeability prediction Self-affine profiles Surface geometries Flow of fluids fluid flow fracture hydrodynamics permeability surface roughness tortuosity
语种	英语
来源机构	Advances in Water Resources
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131809
推荐引用方式 GB/T 7714	Zheng J.,Jin Y.,Liu X.,et al. Validity of triple-effect model for fluid flow in mismatched, self-affine fractures[J]. Advances in Water Resources,2020,140.
APA	Zheng J.,Jin Y.,Liu X.,Wang C.,&Liu X..(2020).Validity of triple-effect model for fluid flow in mismatched, self-affine fractures.,140.
MLA	Zheng J.,et al."Validity of triple-effect model for fluid flow in mismatched, self-affine fractures".140(2020).