Kang, Peter K. Dentz, Marco Le Borgne, Tanguy Juanes, Ruben 2024-01-20T06:31:02Z 2024-01-20T06:31:02Z 2022-01-10 2015-08-28 1539-3755 https://pubs.kist.re.kr/handle/201004/125109 We investigate transport on regular fracture networks that are characterized by heterogeneity in hydraulic conductivity. We discuss the impact of conductivity heterogeneity and mixing within fracture intersections on particle spreading. We show the emergence of non-Fickian transport due to the interplay between the network conductivity heterogeneity and the degree of mixing at nodes. Specifically, lack of mixing at fracture intersections leads to subdiffusive scaling of transverse spreading but has negligible impact on longitudinal spreading. An increase in network conductivity heterogeneity enhances both longitudinal and transverse spreading and leads to non-Fickian transport in longitudinal direction. Based on the observed Lagrangian velocity statistics, we develop an effective stochastic model that incorporates the interplay between Lagrangian velocity correlation and velocity distribution. The model is parameterized with a few physical parameters and is able to capture the full particle transition dynamics. English AMER PHYSICAL SOC ADVECTION-DISPERSION EQUATION RATE MASS-TRANSFER TIME RANDOM-WALKS SOLUTE TRANSPORT TRACER TRANSPORT POROUS-MEDIA DIFFUSION FLOW BOLTZMANN RECOVERY Anomalous transport on regular fracture networks: Impact of conductivity heterogeneity and mixing at fracture intersections Article 10.1103/PhysRevE.92.022148 1 PHYSICAL REVIEW E, v.92, no.2 PHYSICAL REVIEW E 92 2 scie scopus 000360288500002 2-s2.0-84940883626 Physics, Fluids & Plasmas Physics, Mathematical Physics Article ADVECTION-DISPERSION EQUATION RATE MASS-TRANSFER TIME RANDOM-WALKS SOLUTE TRANSPORT TRACER TRANSPORT POROUS-MEDIA DIFFUSION FLOW BOLTZMANN RECOVERY