An efficient algorithm for generation of conforming mesh for three-dimensional discrete fracture networks

Mohajerani, Soheil; Huang, Duruo; Wang, Gang; Jalali, Seyed‐Mohammad Esmaeil; Torabi, Seyed Rahman

doi:10.1108/ec-03-2018-0127

Cited by 5 publications

(4 citation statements)

References 41 publications

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“…(iv) This method succeeds to simulate the grout diffusion behavior in a fracture. On this basis, the quasi-3D model may be further extended to a threedimensional intersected fracture network in the next phase; thus it is possible to simulate the grout injection in a more complex environment [36,37]. where t is time and R is the diffusion radius at time t. is the kinematic viscosity of grout.…”

Section: Resultsmentioning

confidence: 99%

A Quasi-3D Numerical Model for Grout Injection in a Parallel Fracture Based on Finite Volume Method

Hao

Zhong

et al. 2019

Complexity

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The purpose of the present work is to develop a quasi-3D numerical method that can be used to study the diffusion mechanism of grout injection in a rock fracture based on the collocated structured grid of the finite volume method (FVM). Considering the characteristics of fracture in geometry that the aperture is much less than its length and width, the Hele-Shaw model is introduced to deduce the z-derivatives of velocities u and v at walls, which is a function of the relevant average velocity and the fracture aperture. The traditional difference scheme for the diffusive term is partly substituted with the derived analytical expressions; hence a three-dimensional problem of grout flow in the parallel fracture can be transformed into a two-dimensional one that concerns fracture aperture. The new model is validated by the analytical solution and experimental data on three cases of grouting in the parallel-plate fracture. Compared with the results from ANSYS-Fluent software, the present model shows better agreement with the analytical solution for the distribution of pressure and velocity. Furthermore, the new model needs less grid unit, spends less time, but achieves greater accuracy. The complexity of the grout flow field in the rock fracture is reduced; thus the computational efficiency can be improved significantly.

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Section: Resultsmentioning

confidence: 99%

A Quasi-3D Numerical Model for Grout Injection in a Parallel Fracture Based on Finite Volume Method

Hao

Zhong

et al. 2019

Complexity

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“…Berrone et al (2018Berrone et al ( , 2020 used multilevel Monte Carlo and graph theory to solve the problems of time-consuming and excessive assumptions in DFN modeling and used this model to simulate the grouting process of the rock mass. Mohajerani et al (2017Mohajerani et al ( , 2018 proposed calculating the grout permeability of rock joints and fissures based on the pressure before grouting, extended this method to 2D and 3D random fissure networks, and solved the actual diffusion path of grout in fissures by recursion. It also improves the problem of a large number of calculations of the DFN model.…”

Section: 22mentioning

confidence: 99%

The numerical simulation of rock mass grouting: a literature review

Tong

Yang

Duan

et al. 2021

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PurposeThe purpose of this article is to understand the current research status and future development trends in the field of numerical simulation on rock mass grouting.Design/methodology/approachThis article first searched the literature database (EI, Web of Science, CNKI, etc.) for keywords related to the numerical simulation of rock mass grouting to obtain the initial literature database. Then, from the initial database, several documents with strong relevance to the numerical simulation theme of rock mass grouting and high citation rate were selected; some documents from the references were selected as supplements, forming the sample database of this review study (a total of 90 articles). Finally, through sorting out the relationship among the literature, this literature review was carried out.FindingsThe numerical simulation of rock mass grouting is mainly based on the porous media model and the fractured media model. It has experienced the development process from Newtonian fluid to non-Newtonian fluid, from time-invariant viscosity to time-varying viscosity, and from generalized theoretical model to engineering application model. Based on this, this article summarizes four scientific problems that need to be solved in the future in this research field: the law of grout distribution at the cross fissures, the grout diffusion mechanism under multi-field coupling, more accurate grouting theoretical model and simulation technology with strong engineering applicability.Originality/valueThis research systematically analyzes the current research status and shortcomings of numerical simulation on rock mass grouting, summarizes four key issues in the future development of this research field and provides new ideas for the future research on numerical simulation on rock mass grouting.

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“…They suggested that further research was needed to overcome the issues in capturing the detached propeller tip vortices and cloud cavitation. Mohajerani et al (2018) developed algorithm based on a refined conforming Delaunay triangulation scheme to solve the meshing of complex geometry. They showed that optimized minimum internal angle of meshing elements should be predetermined to guarantee termination of the algorithm.…”

Section: Introductionmentioning

confidence: 99%

“…Mohajerani et al (2018) developed algorithm based on a refined conforming Delaunay triangulation scheme to solve the meshing of complex geometry. They showed that optimized minimum internal angle of meshing elements should be predetermined to guarantee termination of the algorithm.…”

Section: Introductionmentioning

confidence: 99%

Accurate marine propellers flow field CFD through anisotropic mesh optimization

Aly

Habashi

2019

HFF

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Purpose Computational fluid dynamics (CFD) simulation of the flow field around marine propellers is challenging because of geometric complexity and rotational effects. To capture the flow structure, grid quality and distribution around the blades is primordial. This paper aims to demonstrate that solution-based automatic mesh optimization is the most logical and practical way to achieve optimal CFD solutions. Design/methodology/approach In the current paper, open water propeller performance coefficients such as thrust and torque coefficients are numerically investigated. An anisotropic mesh adaptation technique is applied, believed for the first time, to marine propellers and to two computational domains. Findings The current study’s performance coefficients are compared with other previously published CFD results and improvements in terms of accuracy and computational cost are vividly demonstrated for different advance coefficients, as well as a much sharper capture of the complex flow features. Originality/value It will be clearly demonstrated that these two improvements can be achieved, surprisingly, at a much lower meshing and computational cost.

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An efficient algorithm for generation of conforming mesh for three-dimensional discrete fracture networks

Cited by 5 publications

References 41 publications

A Quasi-3D Numerical Model for Grout Injection in a Parallel Fracture Based on Finite Volume Method

A Quasi-3D Numerical Model for Grout Injection in a Parallel Fracture Based on Finite Volume Method

The numerical simulation of rock mass grouting: a literature review

Accurate marine propellers flow field CFD through anisotropic mesh optimization

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