Section: New Results

Models and simulations for flow in porous fractured media

A Graphical User Interface for simulating flow and transport in fractured-porous media

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

Grants: H2MNO4 8.2.1

Platform: H2OLab

Publications: [21]

Abstract: The platform H2OLab can be used with a Graphical User Interface, called H2OGuilde, which is developed using a Qt framework. Launchers correspond to a main program and to a hydrogeological application. These launchers call modules or libraries, implementing discretization schemes, solving algorithms, parallel communications, etc. The interface is generic for all the launchers. It is composed of three main tabs corresponding to the three steps of a simulation: entering input data, running computations, analyzing output data. Input parameters are classified in several categories, corresponding to the physical model and the numerical algorithms chosen. Output parameters are of three types, scalar, vector and matrix. Currently, visualization is done outside of the interface.

Meshing Strategies and the Impact of Finite Element Quality on the Velocity Field in Fractured Media

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

Grants: FRACINI 8.1.1

Platform: H2OLab

Publications: [20]

Abstract: For solving flow within a network of fractures, Mixed Hybrid Finite Element (MHFE) method is a method of choice as it yields a symmetric positive definite linear system. However, a drawback is its sensitivity to bad aspect ratio elements. For poor-quality triangles, elementary matrices are ill-conditioned and inconsistent velocity vectors are obtained by inverting these local matrices. In our presentation, we will present different strategies for a better reconstruction of the velocity field.