Section: New Results

Models and simulations for flow in porous fractured media

Synthetic benchmark for modeling flow in 3D fractured media

Participants : Jean-Raynald de Dreuzy, Jocelyne Erhel, Géraldine Pichot.

Grants: GEOFRAC 8.2.5 , FRACINI 8.1.1

Software: MPFRAC

Publications: [14]

Abstract: Intensity and localization of flows in fractured media have promoted the development of a large range of different modeling approaches including Discrete Fracture Networks, pipe networks and equivalent continuous media. While benchmarked usually within site studies, we propose an alternative numerical benchmark based on highly-resolved Discrete Fracture Networks (DFNs) and on a stochastic approach. Test cases are built on fractures of different lengths, orientations, aspect ratios and hydraulic apertures, issuing the broad ranges of topological structures and hydraulic properties classically observed. We present 18 DFN cases, with 10 random simulations by case.

Robust numerical methods for solving flow in stochastic fracture networks

Participants : Jean-Raynald de Dreuzy, Jocelyne Erhel, Géraldine Pichot.

Grants: GEOFRAC 8.2.5 , FRACINI 8.1.1

Software: MPFRAC, H2OLab.

Publications: [29] .

Conferences: [49] .

Abstract: In this work, flow in Discrete Fracture Networks (DFN) is solved using a Mortar Mixed Hybrid Finite Element Method. To solve large linear systems derived from a nonconforming discretization of stochastic fractured networks, a Balancing Domain Decomposition is used. Tests on three stochastically generated DFN are proposed to show the ability of the iterative solver SIDNUR to solve the flow problem.

Flow in complex 3D geological fractured porous media

Participants : Jean-Raynald de Dreuzy, Thomas Dufaud, Jocelyne Erhel, Géraldine Pichot.

Grants: GEOFRAC 8.2.5 , FRACINI 8.1.1

Software: MPFRAC, H2OLab

Conferences: [38] , [39]

Abstract: Taking into account water and solute exchanges between porous and fractured media is of great interest in geological applications. The coupled porous-fractured flow equations and their discretization by a Mixed Hybrid Finite Element Method are presented as well as the derived linear system. An appropriate mesh generation is proposed to deal with the complexity involved by randomly generated fracture networks. Numerical experiments are shown, that provide flow fields for forthcoming transport simulations.