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1. A hybrid high-order method for flow simulations in discrete fracture networks

Author

Florent Hédin, Géraldine Pichot, Alexandre Ern, Simulation for the Environment: Reliable and Efficient Numerical Algorithms (SERENA), Inria de Paris, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Centre d'Enseignement et de Recherche en Mathématiques et Calcul Scientifique (CERMICS), École des Ponts ParisTech (ENPC), This research has been partially supported by the LABEX AMIES ANR-10-LBX-0002-01 project.The authors are grateful to the LabCom fractory (CNRS,Université de Rennes 1 and Itasca Consultants) for providing the geometry and transmissivitydata for all the DFN considered in this paper. The authors warmly thank Nicolas Pignet (EDF)for many fruitful discussions related to DiSk++. Part of the simulations presented in thispaper were carried out using the PlaFRIM experimental testbed, supported by Inria, CNRS(LABRI and IMB), Université de Bordeaux, Bordeaux INP and Conseil Régional d’Aquitaine(see https://www.plafrim.fr/)., This research has been partially supported by the LABEX AMIES ANR-10-LBX-0002-01 project., and Hédin, Florent

Subjects
Discrete fracture, Materials science, business.industry, ComputingMethodologies_SIMULATIONANDMODELING, 010103 numerical & computational mathematics, Mechanics, [MATH.MATH-NA] Mathematics [math]/Numerical Analysis [math.NA], 01 natural sciences, 010101 applied mathematics, Permeability (earth sciences), Software, Flow (mathematics), Fracture (geology), 0101 mathematics, High order, business, [MATH.MATH-NA]Mathematics [math]/Numerical Analysis [math.NA], ComputingMethodologies_COMPUTERGRAPHICS
Abstract

International audience; We are interested in solving flow in large trimensional Discrete Fracture Networks (DFN) with the hybrid high-order (HHO) method. The objectives of this paper are: (1) to demonstrate the benefit of using a high-order method for computing macroscopic quantities, like the equivalent permeability of fracture rocks; (2) to present the computational efficiency of our C++ software, NEF++, which implements the solving of flow in fractures based on the HHO method.

Published
2019

2. Comparative analysis of thermally modified and native spruce loaded perpendicular to the grain

Author

Beate Buchelt, Alexander Pfriem, Mario Zauer, André Wagenführ, Institute of Wood and Paper Technology, and Technische Universität Dresden = Dresden University of Technology (TU Dresden)

Subjects
040101 forestry, 0106 biological sciences, Materials science, Scanning electron microscope, Forestry, 04 agricultural and veterinary sciences, Bending, Thermal treatment, 01 natural sciences, Radial direction, Brittleness, Flexural strength, 010608 biotechnology, Physical Sciences, Perpendicular, Fracture (geology), 0401 agriculture, forestry, and fisheries, General Materials Science, Composite material
Abstract

International audience; The aim of this work was to analyse the material behaviour of thermally modified and native spruce by load applied perpendicularly to the grain. Therefore, thermally modified and native samples were prepared for bending tests with the load in tangential direction. The bending strength in radial direction decreases significantly with the thermal treatment. The fracture surfaces in the tangential section of the bending samples after testing were analysed with a scanning electron microscope. For native samples, the typical failure was found in the intercellular area. For thermally modified samples, failure of the entire cell wall was observed. The material behaviour is more brittle, as demonstrated by the load-deflection curves, but also by anatomical studies of the fracture surfaces.

Published
2010
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