Simulations in large tridimensional Discrete Fracture Networks (DFN): II. Flow simulations

Géraldine Pichot 1 Patrick Laug 2 Jocelyne Erhel 3 Romain Le Goc 4 Caroline Darcel 4 Philippe Davy 5 Jean-Raynald de Dreuzy 5
2 Gamma3 - Automatic mesh generation and advanced methods
ICD - Institut Charles Delaunay, Inria Saclay - Ile de France
3 FLUMINANCE - Fluid Flow Analysis, Description and Control from Image Sequences
IRMAR - Institut de Recherche Mathématique de Rennes, IRSTEA - Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture, Inria Rennes – Bretagne Atlantique
Abstract : We start this presentation by assuming that a model and a mesh of the DFNs have been computed *. We focus here on the numerical methods to solve efficiently single-phase flow problems. We will present the software NEF-Flow dedicated to solving single phase flow in large scale DFNs. NEF stands for Numerical Experiments involving Fractures. The software NEF-Flow is written in Matlab and implements the mixed-hybrid finite element method in an optimized way, using vectorization to decrease the computational time. It handles either matching or non-matching meshes at the intersection between fractures, sink/source terms and contrasts in transmissivities. A large set of benchmark test cases will be presented. Typically, we extended those proposed in [1, 2] to DFNs generated with the UFM framework [3, 4]. These DFNs are large scale DFNs where the fracture size distribution matches the observations and where fractures are organized so that large fractures inhibit the smaller ones, creating T-termination configurations. They may contain hundreds of thousands of fractures. Hydraulic properties will be computed efficiently on these networks. * See Laug et al. MASCOT 2018 abstract, Simulations in large tridimensional Discrete Fracture Networks (DFN): I. Geometric modeling and mesh generation.
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Submitted on : Tuesday, October 16, 2018 - 3:49:02 PM
Last modification on : Friday, April 5, 2019 - 8:18:04 PM

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Géraldine Pichot, Patrick Laug, Jocelyne Erhel, Romain Le Goc, Caroline Darcel, et al.. Simulations in large tridimensional Discrete Fracture Networks (DFN): II. Flow simulations. MASCOT 2018 -15th IMACS/ISGG meeting on applied scientific computing and tools, Oct 2018, Rome, Italy. ⟨hal-01896900⟩

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