Large-scale Mass Transport Modelling in Discretely- Fractured Porous Media

نویسنده

  • Guillaume Kenny
چکیده

A numerical model has been developed for the large-scale simulation of solute transport in discretelyfractured porous media. A generic finite elements code, MEF++, has been used to account for simultaneous flow and transport in 2D fracture and 3D porous medium elements. Equations for the fractures and the porous medium are solve separately but are coupled with a mass transfer term. This mass transfer term is calculated using the concentration gradient and weighted with a coefficient that depends on the porous medium properties, allowing for a general representation of diffusive exchange between fracture and porous medium. Verification and illustrative examples are presented to illustrate the modeling capabilities, including adaptive meshing for the transport solution. RÉSUMÉ Un modèle numérique a été développé pour la simulation à grande échelle du transport de masse dans un milieu poreux à fracturation discrète. Un code d’éléments finis générique, MEF++, a été modifié pour inclure l’écoulement de l’eau et le transport de masse dans des éléments de fractures 2D et des éléments 3D pour la matrice poreuse. Le modèle résout séparément les équations pour les fractures et pour la matrice poreuse, avec couplage par un terme de transfert de masse. Ce terme de transfert est calculé à partir du gradient de concentration entre le milieu poreux et la fracture et il est pondéré par un coefficient dépendant des propriétés du milieu poreux. Cette approche permet une représentation générale du transfert entre fractures et matrice. Des exemples sont présentés pour vérifier le modèle et pour illustrer ses capacités, particulièrement l’adaptation de maillage qui permet d’améliorer les résultats des simulations.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Pore scale simulation of solute transport in fractured porous media

[1] We investigate the effects of the porosity (and thus permeability) of porous matrix and the fracture aperture on transport in fractured porous media. We do so with detailed lattice Boltzmann simulations on constructed porous media with a single fracture. Both plume spatial moments (the average plume velocity and the dispersion coefficients) and mass transfer coefficients between the facture...

متن کامل

Grid re®nement for modeling multiphase ̄ow in discretely fractured porous media

A study of the e€ects of grid discretization on the migration of DNAPL within a discrete-fracture network embedded in a porous rock matrix is presented. It is shown that an insuciently ®ne discretization of the fracture elements can lead to an overprediction of the volume of DNAPL that continues to migrate vertically at the intersection of a vertical and horizontal fracture. Uniform discretiza...

متن کامل

A parallel scientific software for heterogeneous hydrogeoloy

Numerical modelling is an important key for the management and remediation of groundwater resources. As opposed to surface water and to highly karstic geologies, groundwater does not flow in well-identified open streams but is like water flowing in the voids of a sponge. Several field experiments show that the natural geological formations are highly heterogeneous, leading to preferential flow ...

متن کامل

Modeling Two Phase Flow in Large Scale Fractured Porous Media with an Extended Multiple Interacting Continua Method

We present a two phase flow conceptual model, the corresponding simulator (2pMINC) and a workflow for large-scale fractured reservoirs, based on a continuum fracture approach which uses the multiple interacting continua (MINC) method complemented with an improved upscaling technique. The complex transient behavior of the flow processes in fractured porous media is captured by subgridding the co...

متن کامل

Modelling flow and solute transport in fractured porous media

A BEM numerical model is presented for the flow and solute transport in fractured porous media, which is based on the dual reciprocity method multi domain scheme (DRM-MD). The model solves the 3D flow equation based on the Darcy law in the coupled system of porous media, fracture network and fracture intersections. Unlike the discrete fracture models, which for simplicity use Fick's law in the ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2004