Comparison of advanced discretization techniques for image-based modelling of heterogeneous porous rocks

Karim Ehab Moustafa Kamel Jean-Baptiste Colliat 1 Pierre Gérard Thierry J. Massart
1 LaMcube - Laboratoire de Mécanique Multiphysique Multiéchelle
Abstract : This contribution presents an assessment of computational techniques enabling automated simulations of complex porous rocks microstructures based on 3D imaging techniques. A subset of a CT-scanned sandstone sample is used to compare the results obtained by two advanced discretization frameworks. Raw scan results are processed by a level-set-based segmentation technique to produce smooth geometries prone to finite element discretizations. A recently developed technique is outlined for conforming mesh generation for complex porous geometries described implicitly by functions. This allows generating high-quality tetrahedral meshes with selective refinement. Next to this, a technique that uses a kinematic enrichment by incompatible modes to represent the heterogeneous geometry is explained. Both techniques use the same implicit geometry as main input for the simulations. Mechanical simulations are conducted on a subset of a scanned sample of a sandstone under triaxial loading conditions for isotropic compressive loading and for loading conditions involving a stress deviator. The results are compared and discussed based on local stress distributions and on a Mohr–Coulomb criterion with tensile cut-off. The results show that both discretization strategies yield complementary tools and allow envisioning automated simulations based on raw CT scan data for porous rocks exhibiting complex pore space morphologies.
Type de document :
Article dans une revue
Liste complète des métadonnées
https://hal.univ-lille.fr/hal-02173194
Contributeur : Lilloa Université de Lille <>
Soumis le : jeudi 4 juillet 2019 - 12:41:10
Dernière modification le : mardi 17 septembre 2019 - 11:26:15

Identifiants

Collections

UNIV-LILLE | CNRS

Citation

Karim Ehab Moustafa Kamel, Jean-Baptiste Colliat, Pierre Gérard, Thierry J. Massart. Comparison of advanced discretization techniques for image-based modelling of heterogeneous porous rocks. Acta Geotechnica, 2019, Acta Geotechnica, ⟨10.1007/s11440-019-00798-7⟩. ⟨hal-02173194⟩

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

28

Contact

Informations

CCSD