Ivar Stefansson is a researcher in the Porous Media Group and the Vista Center for Modeling of Coupled Subsurface Dynamic at the Department of Mathematics. His research is related to development and implementation of numerical methods and simulation technology for fractured porous media. These methods help us understanding subsurface processes such as extraction of geothermal energy. Ivar is also one of the core developers of the PorePy simulation toolbox.

Academic lecture

• Berre, Inga; Both, Jakub Wiktor; Halldorsdottir, Sæunn et al. (2024). Mathematical and Numerical Modelling of Process-Structure Interaction in FracturedGeothermal Systems. (external link)
• Jacobsen, Ingrid Kristine; Berre, Inga; Nordbotten, Jan Martin et al. (2024). An MPSA-Newmark discretization of the elastic wave equation with absorbing boundary conditions. (external link)
• Berre, Inga; Banshoya, Shin Irgens; Stefansson, Ivar et al. (2024). Simulation of THMC processes in fractured porous media . (external link)
• Stefansson, Ivar (2024). A simple and efficient line search for nonlinear and semismooth multiphysics problems . (external link)
• Berre, Inga; Stefansson, Ivar (2024). Process-structure interaction in geothermal reservoirs: modeling and simulation. (external link)
• Stefansson, Ivar; Keilegavlen, Eirik; Both, Jakub Wiktor et al. (2024). Multiphysics simulation of fractured geothermal systems using PorePy. (external link)
• Stefansson, Ivar (2023). Elastic normal fracture deformation ​ in thermoporomechanical media. (external link)
• Stefansson, Ivar (2023). Modeling and Simulation of Fracture Deformation in Coupled Problems. (external link)
• Keilegavlen, Eirik; Banshoya, Shin Irgens; Halldorsdottir, Sæunn et al. (2022). Modeling and Simulation of Thermo-Hydro-Mechanical-Chemical Processes in Fractured Rocks with Applications to Geothermal Energy. (external link)
• Stefansson, Ivar; Rinaldi, Antonio; Driesner, Thomas et al. (2022). Mixed-dimensional hydromechanical modelling of an in situ hydroshearing experiment. (external link)
• Halldorsdottir, Sæunn; Berre, Inga; Keilegavlen, Eirik et al. (2021). Thermal fracturing and natural convection: A hidden source of geothermal activity in the earth’s crust?. (external link)
• Berre, Inga; Ervik, Haakon Langeland; Stefansson, Ivar et al. (2021). Discrete Fracture-Matrix Modelling of Coupled THM Processes and Fracture Deformation. (external link)
• Keilegavlen, Eirik; Stefansson, Ivar; Berre, Inga et al. (2020). A simulation model for fracture reactivation accounting for thermo-hydro-mechanical forces with applications to geothermal systems. (external link)
• Berre, Inga; Berge, Runar Lie; Dang, Hau Trung et al. (2020). Modelling of process-structure interaction resulting from fluid injection in fractured subsurface systems. (external link)
• Stefansson, Ivar; Berre, Inga; Fumagalli, Alessio et al. (2019). Numerical Methods for Flow in Fractured Porous Media in a Unified Implementation. (external link)
• Keilegavlen, Eirik; Stefansson, Ivar; Berre, Inga et al. (2019). Enhancing Geothermal Reservoirs – Modelling and Analysis of Hydraulic and Thermal Stimulation. (external link)
• Keilegavlen, Eirik; Fumagalli, Alessio; Stefansson, Ivar et al. (2019). Mixed-dimensional discrete fracture matrix models with heterogeneous discretization and non-matching grids. (external link)
• Stefansson, Ivar; Berre, Inga; Keilegavlen, Eirik et al. (2018). Modelling of thermal shock induced fracture growth. (external link)
• Berge, Runar Lie; Keilegavlen, Eirik; Fumagalli, Alessio et al. (2018). PorePy: A Python Simulation Tool for Fractured and Deformable Porous Media​. (external link)
• Keilegavlen, Eirik; Fumagalli, Alessio; Stefansson, Ivar et al. (2018). Unified modeling and discretization of flow in fractured porous media. (external link)
• Berre, Inga; Flemisch, Bernd; Scotti, Anna et al. (2017). [2] Benchmarking and comparison of numerical methods: overall considerations and a recent study of methods for flow in fractured porous media, Flow in Deformable Porous Media: Numerics and Benchmarks. (external link)
• Keilegavlen, Eirik; Fumagalli, Alessio; Berge, Runar Lie et al. (2017). PorePy: A Python Simulation Tool for Fractured and Deformable Porous Media. (external link)
• Keilegavlen, Eirik; Fumagalli, Alessio; Berge, Runar Lie et al. (2017). Discretization of mixed-dimensional problems using legacy codes. (external link)
• Stefansson, Ivar; Berre, Inga; Keilegavlen, Eirik (2017). Handling of Fractures and Intersections in Finite Volume Methods. (external link)

Poster

• Berre, Inga; Stefansson, Ivar (2024). Multi-Point Finite Volume Method for Fracture Propagation in Linear Elastic Media. (external link)
• Berre, Inga; Stefansson, Ivar (2024). Multi-Point Finite Volume Method for Fracture Propagation in Linear Elastic Media. (external link)
• Stefansson, Ivar; Berre, Inga; Keilegavlen, Eirik (2019). Simulation of temperature and pressure driven fracture deformation. (external link)
• Stefansson, Ivar; Keilegavlen, Eirik; Berre, Inga (2017). Coupling Conditions for Finite Volume Methods for Fractured Porous Media. (external link)
• Stefansson, Ivar; Berre, Inga; Keilegavlen, Eirik (2017). Finite Volume Methods for Flow and Transport in 3-Dimensional Fractured Porous Media. (external link)

Popular scientific article

• Jacobsen, Ingrid Kristine; Nevland, Marius; Stefansson, Ivar (2024). Geotermisk energi. (external link)
• Stefansson, Ivar (2022). Slik kan vi hente stabil, fornybar energi fra under bakken. (external link)
• Stefansson, Ivar (2022). Slik kan vi hente stabil, fornybar energi fra under bakken. (external link)
• Stefansson, Ivar (2019). Geotermisk energiproduksjon. (external link)

Lecture

• Stefansson, Ivar; Nermoen, Anders; Wheeler, Walter H et al. (2024). Ground source heat in Norway – on the value gained by firm, renewable, carbon neutral, local and areal effective thermal resources by the Geothermal Energy Association of Norway. (external link)
• Nermoen, Anders; Iversen, Fionn; Stefansson, Ivar (2023). Network Meeting Bergen: Ground Source Heat Pump Energy System . (external link)
• Nermoen, Anders; Pelfrene, Gilles; Iversen, Fionn et al. (2023). GeoEnergy 2023. (external link)
• Stefansson, Ivar; Berre, Inga; Keilegavlen, Eirik (2017). Coupled processes in geothermal systems. (external link)

Academic article

• Stefansson, Ivar (2024). A line search algorithm for multiphysics problems with fracture deformation. (external link)
• Stefansson, Ivar; Varela, Jhabriel; Keilegavlen, Eirik et al. (2024). Flexible and rigorous numerical modelling of multiphysics processes in fractured porous media using PorePy. (external link)
• Stefansson, Ivar; Keilegavlen, Eirik (2023). Numerical Treatment of State-Dependent Permeability in Multiphysics Problems. (external link)
• Berre, Inga; Boon, Wietse; Flemisch, Bernd et al. (2021). Verification benchmarks for single-phase flow in three-dimensional fractured porous media. (external link)
• Keilegavlen, Eirik; Berge, Runar Lie; Fumagalli, Alessio et al. (2021). PorePy: an open-source software for simulation of multiphysics processes in fractured porous media. (external link)
• Stefansson, Ivar; Keilegavlen, Eirik; Berre, Inga (2021). A fully coupled numerical model of thermo-hydro-mechanical processes and fracture contact mechanics in porous media. (external link)
• Keilegavlen, Eirik; Duboeuf, Laure; Dichiarante, Anna Maria et al. (2021). Hydro-mechanical simulation and analysis of induced seismicity for a hydraulic stimulation test at the Reykjanes geothermal field, Iceland. (external link)
• Stefansson, Ivar; Keilegavlen, Eirik; Halldorsdottir, Sæunn et al. (2021). Numerical Modelling of Convection-Driven Cooling, Deformation and Fracturing of Thermo-Poroelastic Media. (external link)
• Berre, Inga; Stefansson, Ivar; Keilegavlen, Eirik (2020). Fault slip in hydraulic stimulation of geothermal reservoirs: Governing mechanisms and process-structure interaction. (external link)
• Keilegavlen, Eirik; Fumagalli, Alessio; Berge, Runar Lie et al. (2019). Implementation of mixed-dimensional models for flow in fractured porous media. (external link)
• Stefansson, Ivar; Berre, Inga; Keilegavlen, Eirik (2018). Finite-volume discretisations for flow in fractured porous media. (external link)
• Flemisch, Bernd; Berre, Inga; Boon, Wietse et al. (2018). Benchmarks for single-phase flow in fractured porous media. (external link)

Popular scientific lecture

• Stefansson, Ivar (2024). Some whys and hows of computational mathematics. (external link)

Software

• Keilegavlen, Eirik; Stefansson, Ivar; Duran, Omar et al. (2023). PorePy: A Simulation Tool for Fractured and Deformable Porous Media, version 1.8.1. (external link)
• Keilegavlen, Eirik; Stefansson, Ivar; Varela, Jhabriel et al. (2021). PorePy versjon 1.5 (simuleringsverktøy for prosesser i oppsprukne porøse medier). (external link)
• Stefansson, Ivar; Keilegavlen, Eirik; Berge, Runar Lie et al. (2020). PorePy: Python Simulation Tool for Fractured and Deformable Porous Media. Versjon 1.3. (external link)
• Keilegavlen, Eirik; Fumagalli, Alessio; Berge, Runar Lie et al. (2019). PorePy: A Simulation Tool for Fractured and Deformable Porous Media written in Python, v.1.0. (external link)
• Keilegavlen, Eirik; Fumagalli, Alessio; Berge, Runar Lie et al. (2018). PorePy: A Simulation Tool for Fractured and Deformable Porous Media written in Python, versjon 0.4.3. (external link)
• Keilegavlen, Eirik; Fumagalli, Alessio; Berge, Runar Lie et al. (2017). PorePy: A Simulation Tool for Fractured and Deformable Porous Media written in Python. (external link)
• Keilegavlen, Eirik; Fumagalli, Alessio; Berge, Runar Lie et al. (2017). PorePy: A Python Simulation Tool for Fractured and Deformable Porous Media. Version 0.2. (external link)

Documentary

• Nordbotten, Jan Martin; Berge, Runar Lie; Stefansson, Ivar (2022). Runar Lie Berge - Numerical methods for coupled processes in fractured porous media. (external link)
• Nordbotten, Jan Martin; Budisa, Ana; Stefansson, Ivar (2022). Ana Budiša - Preconditioning for Flow in Fractured Porous Media. (external link)

Academic chapter/article/Conference paper

• Stefansson, Ivar; Berge, Runar Lie; Berre, Inga et al. (2021). Modelling of Thermally Induced Fracture Slip caused by Fluid Injection During Geothermal Production. (external link)
• Stefansson, Ivar; Berre, Inga; Keilegavlen, Eirik (2020). Finite Volume Discretisation of Fracture Deformation in Thermo-poroelastic Media. (external link)

See a complete overview of publications in Cristin.