scholarly journals Fourth-order approximation of fluid flow through rough-walled rock fracture

2003 ◽  
Vol 39 (8) ◽  
Author(s):  
J. Inoue ◽  
H. Sugita
Keyword(s):  
Fluid Flow ◽  
Fourth Order ◽  
Order Approximation ◽  
Rock Fracture ◽  
Flow Through

scholarly journals Experimental Study on Stress-Dependent Nonlinear Flow Behavior and Normalized Transmissivity of Real Rock Fracture Networks

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Qian Yin ◽  
Hongwen Jing ◽  
Richeng Liu ◽  
Guowei Ma ◽  
Liyuan Yu ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Rock Fracture ◽  
Hydraulic Gradient ◽  
Nonlinear Flow ◽  
Fracture Networks ◽  
Critical Hydraulic Gradient ◽  
Boundary Load ◽  
Flow Through ◽  
Stress Dependent ◽  
Rock Fracture Networks

The mechanism and quantitative descriptions of nonlinear fluid flow through rock fractures are difficult issues of high concern in underground engineering fields. In order to study the effects of fracture geometry and loading conditions on nonlinear flow properties and normalized transmissivity through fracture networks, stress-dependent fluid flow tests were conducted on real rock fracture networks with different number of intersections (1, 4, 7, and 12) and subjected to various applied boundary loads (7, 14, 21, 28, and 35 kN). For all cases, the inlet hydraulic pressures ranged from 0 to 0.6 MPa. The test results show that Forchheimer’s law provides an excellent description of the nonlinear fluid flow in fracture networks. The linear coefficient a and nonlinear coefficient b in Forchheimer’s law J=aQ+bQ2 generally decrease with the number of intersections but increase with the boundary load. The relationships between a and b can be well fitted with a power function. A nonlinear effect factor E=bQ2/(aQ+bQ2) was used to quantitatively characterize the nonlinear behaviors of fluid flow through fracture networks. By defining a critical value of E = 10%, the critical hydraulic gradient was calculated. The critical hydraulic gradient decreases with the number of intersections due to richer flowing paths but increases with the boundary load due to fracture closure. The transmissivity of fracture networks decreases with the hydraulic gradient, and the variation process can be estimated using an exponential function. A mathematical expression T/T0=1-exp⁡(-αJ-0.45) for decreased normalized transmissivity T/T0 against the hydraulic gradient J was established. When the hydraulic gradient is small, T/T0 holds a constant value of 1.0. With increasing hydraulic gradient, the reduction rate of T/T0 first increases and then decreases. The equivalent permeability of fracture networks decreases with the applied boundary load, and permeability changes at low load levels are more sensitive.

Research Advance in Fluid Flow through a Single Rock Fracture

2012 ◽  
Vol 204-208 ◽  
pp. 628-634
Author(s):  
Bao Hua Guo ◽  
Cai Xia Tian
Keyword(s):  
Fluid Flow ◽  
Fractured Rock ◽  
Rock Fracture ◽  
Research Work ◽  
Engineering Practice ◽  
Flow Through ◽  
Research Advance ◽  
Single Rock Fracture ◽  
Fractured Rock Masses ◽  
Channeling Flow

Flow properties through a single rock fracture are the foundation of researching fluid flow in fractured rock masses. Many researchers at home and abroad are engaging in this subject for the urgent need of engineering practice. This article mainly introduces concepts of roughness, aperture, tortuosity, channeling flow, and influencing factors of stress, temperature, anisotropic, inlet head, scale effect, solution etc. Finally, some research work should be done in future are given.

A Forchheimer Equation-Based Flow Model for Fluid Flow Through Rock Fracture During Shear

2018 ◽  
Vol 51 (9) ◽  
pp. 2777-2790 ◽  
Author(s):  
Guan Rong ◽  
Jie Yang ◽  
Long Cheng ◽  
Jie Tan ◽  
Jun Peng ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Flow Model ◽  
Rock Fracture ◽  
Forchheimer Equation ◽  
Flow Through

Analysis of the Laminar Newtonian Fluid Flow Through a Thin Fracture Modelled as a Fluid-Saturated Sparsely Packed Porous Medium

2017 ◽  
Vol 72 (3) ◽  
pp. 253-259 ◽  
Author(s):  
Igor Pažanin ◽  
Pradeep G. Siddheshwar
Keyword(s):  
Porous Medium ◽  
Fluid Flow ◽  
Order Approximation ◽  
Saturated Porous Medium ◽  
Darcy Law ◽  
Brinkman Model ◽  
Order Of Accuracy ◽  
Flow Through ◽  
Fluid Saturated Porous Medium ◽  
Flow Inertia

AbstractIn this article we investigate the fluid flow through a thin fracture modelled as a fluid-saturated porous medium. We assume that the fracture has constrictions and that the flow is governed by the prescribed pressure drop between the edges of the fracture. The problem is described by the Darcy-Lapwood-Brinkman model acknowledging the Brinkman extension of the Darcy law as well as the flow inertia. Using asymptotic analysis with respect to the thickness of the fracture, we derive the explicit higher-order approximation for the velocity distribution. We make an error analysis to comment on the order of accuracy of the method used and also to provide rigorous justification for the model.

scholarly journals Modelling of Coupled Hydro-Thermo-Chemical Fluid Flow through Rock Fracture Networks and Its Applications

Geosciences ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 153
Author(s):  
Chaoshui Xu ◽  
Shaoqun Dong ◽  
Hang Wang ◽  
Zhihe Wang ◽  
Feng Xiong ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Rock Mass ◽  
Rock Fracture ◽  
Fractured Reservoirs ◽  
Experimental Studies ◽  
Heat Extraction ◽  
Rock Masses ◽  
Fracture Networks ◽  
Fracture Intersection ◽  
Flow Through

Most rock masses contain natural fractures. In many engineering applications, a detailed understanding of the characteristics of fluid flow through a fractured rock mass is critically important for design, performance analysis, and uncertainty/risk assessment. In this context, rock fractures and fracture networks play a decisive role in conducting fluid through the rock mass as the permeability of fractures is in general orders of magnitudes greater than that of intact rock matrices, particularly in hard rock settings. This paper reviews the modelling methods developed over the past four decades for the generation of representative fracture networks in rock masses. It then reviews some of the authors’ recent developments in numerical modelling and experimental studies of linear and non-linear fluid flow through fractures and fracture networks, including challenging issues such as fracture wall roughness, aperture variations, flow tortuosity, fracture intersection geometry, fracture connectivity, and inertia effects at high Reynolds numbers. Finally, it provides a brief review of two applications of methods developed by the authors: the Habanero coupled hydro-thermal heat extraction model for fractured reservoirs and the Kapunda in-situ recovery of copper minerals from fractures, which is based on a coupled hydro-chemical model.

Navier-Stokes Simulations of Fluid Flow Through a Rock Fracture

2013 ◽  
pp. 55-64 ◽  
Author(s):  
Azzan H. Al-Yaarubi ◽  
Chris C. Pain ◽  
Carlos A. Grattoni ◽  
Robert W. Zimmerman
Keyword(s):  
Fluid Flow ◽  
Rock Fracture ◽  
Navier Stokes ◽  
Flow Through
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