Numerical modeling of the effects of roughness on flow and eddy formation in fractures

被引:78
作者
Briggs, Scott [1 ]
Karney, Bryan W. [1 ]
Sleep, Brent E. [1 ]
机构
[1] Univ Toronto, Toronto, ON M5S 1A4, Canada
关键词
Hydrogeology; Fracture flow; Fracture roughness; Computational fluid dynamics; Lattice Boltzmann method (LBM); FLUID-FLOW; CUBIC LAW; ROCK FRACTURES; HYDRAULIC CONDUCTIVITY; TRANSPORT; SIMULATION; LAMINAR; NUMBER; STOKES;
D O I
10.1016/j.jrmge.2016.08.004
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The effect of roughness on flow in fractures was investigated using lattice Boltzmann method (LBM). Simulations were conducted for both statistically generated hypothetical fractures and a natural dolomite fracture. The effect of increasing roughness on effective hydraulic aperture, Izbash and Forchheimer parameters with increasing Reynolds number (Re) ranging from 0.01 to 500 was examined. The growth of complex flow features, such as eddies arising near the fracture surface, was directly associated with changes in surface roughness. Rapid eddy growth above Re values of 1, followed by less rapid growth at higher Re values, suggested a three-zone nonlinear model for flow in rough fractures. This three-zone model, relating effective hydraulic conductivity to Re, was also found to be appropriate for the simulation of water flow in the natural dolomite fracture. Increasing fracture roughness led to greater eddy volumes and lower effective hydraulic conductivities for the same Re values. (C) 2017 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.
引用
收藏
页码:105 / 115
页数:11
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