Modeling of transport processes through large-scale discrete fracture networks using conforming meshes and open-source software

JOURNAL OF HYDROLOGY

卷:554

Article

Ngo, Tri Dat¹  Fourno, Andre¹  Noetinger, Benoit¹ 

[1] IFP Energies Nouvelles, 1&4 Ave Bois Preau, F-92500 Rueil Malmaison, France

关键词: DFN;    Conforming mesh;    Non-manifold topology;    Transport processes;    Vertex-centered finite volume method;   

DOI  :  10.1016/j.jhydrol.2017.08.052

来源: Elsevier

【 摘 要 】

Most industrial and field studies of transport processes in Discrete Fracture Networks (DFNs) involve strong simplifying assumptions, especially at the meshing stage. High-accuracy simulations are therefore required for validating these simplified models and their domain of validity. The present paper proposes an efficient workflow based on open-source software to obtain transport simulations. High-quality computational meshes for DFNs are first generated using the conforming meshing approach FraC. Then, a tracer transport model implemented in the open-source code DuMux is used for simulating tracer transport driven by the advection-dispersion equation. We adopt the box method, a vertex-centered finite volume scheme for spatial discretization, which ensures concentration continuity and mass conservation at intersections between fractures. Numerical results on simple networks for validation purposes and on complex realistic DFNs are presented. An a-posteriori convergence study of the discretization method shows an order of convergence O(h) for tracer concentration with h the mesh size. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free