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Title: Characterizing the impact of particle behavior at fracture intersections in three-dimensional discrete fracture networks

Journal Article · · Physical Review E

We characterize the influence of different intersection mixing rules for particle tracking simulations on transport properties through three-dimensional discrete fracture networks. It is too computationally burdensome to explicitly resolve all fluid dynamics within a large three-dimensional fracture network. In discrete fracture network (DFN) models, mass transport at fracture intersections is modeled as a subgrid scale process based on a local Péclet number. The two most common mass transfer mixing rules are (1) complete mixing, where diffusion dominates mass transfer, and (2) streamline routing, where mass follows pathlines through an intersection. Although it is accepted that mixing rules impact local mass transfer through single intersections, the effect of the mixing rule on transport at the fracture network scale is still unresolved. Through the use of explicit particle tracking simulations, we study transport through a quasi-two-dimensional lattice network and a three-dimensional network whose fracture radii follow a truncated power-law distribution. We find that the impact of the mixing rule is a function of the initial particle injection condition, the heterogeneity of the velocity field, and the geometry of the network. Furthermore, our particle tracking simulations show that the mixing rule can particularly impact concentrations on secondary flow pathways. As a result, we relate these local differences in concentration to reactive transport and show that streamline routing increases the average mixing rate in DFN simulations.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
89233218CNA000001; 20180621ECR; 20170103DR; AC52-06NA25396
OSTI ID:
1495161
Alternate ID(s):
OSTI ID: 1492111
Report Number(s):
LA-UR-18-29382; PLEEE8
Journal Information:
Physical Review E, Vol. 99, Issue 1; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (2)

Particle-Based Workflow for Modeling Uncertainty of Reactive Transport in 3D Discrete Fracture Networks journal November 2019
Stress‐Induced Anomalous Transport in Natural Fracture Networks text January 2019

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