My main field of work has been related to mathematical and numerical modeling of flow and transport in porous media. In my research work. I have been interested in up-scaling from pore- to continuum scale and further to field scale. A particular topic of interest has been Lagrangian-type methods for advection-dominated (hyperbolic) transport. I have also been interested in pore-scale modeling. More recently, I have worked on modeling of geological storage of CO2. A main challenge has been to derive efficient numerical methods to predict the distribution and migration of a CO2-plume under different storage scenarios. Important questions are to derive and identify as physically simple models as possible, and still capture the main features of the processes.

Poster

• Onal, Eda; Keilegavlen, Eirik; Dahle, Helge K. et al. (2024). Coupling Strategies in Large-Scale Simulations of CO2 Storage. (external link)
• Hægland, Håkon; Dahle, Helge Ketil; Eigestad, Geir Terje et al. (2006). Streamline methods on grids adapting to fractures. (external link)
• Khattri, Sanjay Kumar; Fladmark, Gunnar E; Dahle, Helge Ketil (2004). Numerics of CO2 sequestration. (external link)
• Nordbotten, Jan Martin; Celia, Michael A.; Bachu, Stefan et al. (2004). Similarity solutions for CO2 injection in aquifers. (external link)
• Nordhaug, Hans Fredrik; Celia, Michael A.; Dahle, Helge Ketil (2000). Two phase flow: Two coupled equations for interfacial area and saturation. (external link)
• Dahle, Helge Ketil; Nordhaug, Hans Fredrik; Celia, Michael A. et al. (2000). A Two Phase Flow Model Including Dynamics of Interfacial Areas. (external link)
• Nordhaug, Hans Fredrik; Celia, Michael A.; Dahle, Helge Ketil (2000). Two Phase Flow, Interfacial Area and Dynamic Network Modeling. (external link)
• Brusedal, Kari; Dahle, Helge Ketil; Karlsen, Kenneth Hvistendahl et al. (1997). Operator splitting and an inverse problem for the Buckley-Leverett equation. (external link)

Editorial

• Helmig, Rainer; Hassanizadeh, S. Majid; Dahle, Helge K. (2016). Foreword: NUPUS: Porous Media Research Has Got a Brand Name. (external link)

Doctoral dissertation

• Zamani, Nematollah; Skauge, Arne; Dahle, Helge K. et al. (2015). Pore Scale Modeling of Polymer Flow Using the Navier-Stokes Approach. (external link)
• Berre, Inga; Dahle, Helge Ketil; Mannseth, Trond et al. (2005). Fast Simulation of Transport and Adaptive Permeability Estimation in Porous Media. (external link)
• Dahle, Helge K. (1989). Adaptive characteristic operator splitting techniques for convection-dominated diffusion problems in one and two space dimensions. (external link)

Lecture

• Gasda, Sarah Eileen; Gray, William; Dahle, Helge K. (2014). Vertically integrated models with coupled thermal processes. (external link)
• Dahle, Helge K. (2012). Kan CO2-lagring på lange tidsskalaer modelleres?. (external link)

Academic chapter/article/Conference paper

• Gasda, Sarah Eileen; Gray, William; Dahle, Helge K. (2014). Vertically integrated models with coupled thermal processes. (external link)
• Gasda, Sarah Eileen; du Plessis, Elsa; Dahle, Helge K. (2013). Upscaled models for CO2 injection and migration in geological systems. (external link)
• Dahle, Helge Ketil; Johansen, Torbjørn Ole Widnes; Botnen, Tone et al. (1998). A characteristic domain decomposition method for modelling the flow in a coastal aquifer. (external link)

Academic lecture

• Gasda, Sarah Eileen; Dahle, Helge K.; Nordbotten, Jan Martin et al. (2013). Quantifying storage capacity using upscaled models for CO2 storage. (external link)
• Gasda, Sarah Eileen; Andersen, Odd; Nilsen, Halvor Møll et al. (2013). Coupled Thermal Models with Vertical Equilibrium for CO2 storage. (external link)
• Gasda, Sarah Eileen; Aavatsmark, Ivar; Stephansen, Annette F. et al. (2013). Upscaled modeling of CO2 injection with coupled thermal processes. (external link)
• Gasda, Sarah Eileen; Nilsen, Halvor Møll; Dahle, Helge K. et al. (2012). Effective models for CO2 migration in geological systems with varying topography. (external link)
• Gasda, Sarah Eileen; Dahle, Helge K.; Nilsen, Halvor Møll (2012). Upscaled models for CO2 migration. (external link)
• Gasda, Sarah Eileen; Nilsen, Halvor Møll; Dahle, Helge K. (2012). Upscaled models for CO2 migration in geological formations with structural heterogeneity. (external link)
• Hægland, Håkon; Dahle, Helge Ketil; Aavatsmark, Ivar et al. (2006). Adaptive streamline tracing for streamline simulation on irregular grids. (external link)
• Hægland, Håkon; Celia, Michael A.; Dahle, Helge Ketil et al. (2006). Streamline methods on fault adapted grids for risk assessment of storage of CO2 in geological formations. (external link)
• Nordbotten, Jan Martin; Celia, Michael A.; Dahle, Helge Ketil et al. (2006). On the definition of macro-scale pressure for multi-phase flow in porous media. (external link)
• Hægland, Håkon; Lie, Knut-Andreas; Dahle, Helge Ketil et al. (2006). Adaptive Streamline Tracing for Streamline Simulation on Irregular Grids. (external link)
• Eikemo, Birgitte; Berre, Inga; Dahle, Helge Ketil et al. (2006). A Discontinuous Galerkin Method for Computing Time-of-Flight in Discrete-Fracture Models. (external link)
• Celia, Michael A.; Bachu, Stefan; Nordbotten, Jan Martin et al. (2004). Quantitative estimation of CO2 leakage from geological storage: Analytical models, numerical models, and data needs. (external link)
• Gielen, Twan; Hassanizadeh, S. Majid; Celia, Michael A. et al. (2004). A pore-scale network approach to investifate dynamic effects in multiphase flow. (external link)
• Dahle, Helge Ketil (2004). Dynamic Effects in Constitutive Relationships for Two-Phase Flow in Porous Media: Insights From and About Bundle of Tubes Models. (external link)
• Celia, Michael A.; Dahle, Helge Ketil; Hassanizadeh, S. Majid (2004). Dynamic Effects in Capillary Pressure Relationships for Two-phase Flow in Porous Media: Insights from Bundle-of-Tubes Models and their Implications. (external link)
• Heimsund, Bjørn-Ove; Dahle, Helge Ketil; Espedal, Magne (2004). Adjoint methods are particle methods: Implications for Eulerian-Langrangian modeling of multiphase multicomponent transport. (external link)
• Dahle, Helge Ketil; Celia, Michael A.; Hassanizadeh, S. Majid (2003). A Bundle of Capillary Tubes Model to Investigate Dynamic Effects in the Capillary-Pressure-Saturation Relationship. (external link)
• Heimsund, Bjørn-Ove; Dahle, Helge Ketil; Espedal, Magne (2003). Eulerian-Lagrangian methods for non-linear advection problems. (external link)
• Berre, Inga; Dahle, Helge Ketil; Karlsen, Kenneth Hvistendahl et al. (2002). A streamline front-tracking method for two- and three-phase flow including capillary forces. (external link)
• Dahle, Helge Ketil (2002). A total pressure-saturation formulation of two-phase flow incorperating dynamic effects in the capillary-pressure-saturation relationship. (external link)
• Dahle, Helge Ketil (2002). Time-of-flight+transport collapse: An alternative to streamlines for two-phase porous media flow with capillary forces. (external link)
• Dahle, Helge Ketil (2002). Study of Pc-Sw relationship using a dynamic pore-scale network model. (external link)
• Celia, Michael A.; Dahle, Helge Ketil; Hassanizadeh, S. Majid (2000). Dynamic pore-scale network models for two-phase flow in porous media. (external link)
• Ask, Ann K.; Dahle, Helge Ketil; Karlsen, Kenneth Hvistendahl et al. (2000). A local streamline Eulerian-Lagrangian method for two-phase flow. (external link)
• Nordhaug, Hans Fredrik; Ask, Ann K.; Dahle, Helge Ketil et al. (2000). A Sketch: Solving a Multidimensional Three Phase Flow Problem. (external link)
• Dahle, Helge Ketil; Nordhaug, Hans Fredrik; Gray, William G. et al. (2000). A Two Phase Flow Model Including Dynamics of Interfacial Area. (external link)
• Nordhaug, Hans Fredrik; Dahle, Helge Ketil; Espedal, Magne et al. (2000). Two phase flow including interfacial area as a variable. (external link)
• Celia, M.A.; Reeves, P.C.; Dahle, Helge Ketil (1998). On the use of pore-scale computational models for two-phase porous media flows. (external link)
• Dahle, Helge Ketil (1997). Numerisk modellering av strømning i grunnvannsreservoar. (external link)
• Dahle, Helge Ketil; Celia, M.; Hassanizadeh, M. (1997). A dynamic algorithm for simulating two-phase flow in a pore-scale network model. (external link)
• Tai, Xue-Cheng; Dahle, Helge Ketil; Espedal, Magne (1997). Identification of the discontinuios permability of a one phase flow reservoir by Petrov-Galerkin method. (external link)
• Dahle, Helge Ketil; Celia, M.; Karlsen, Kenneth Hvistendahl (1997). Combining the corrected operator splitting method with streamline computation to solve nonlinear advection-diffusion equations. (external link)
• Karlsen, Kenneth Hvistendahl; Dahle, Helge Ketil; Frøyen, J. et al. (1997). Corrected operator splitting for nonlinear advection-diffusion. (external link)
• Tai, Xue-Cheng; Johansen, O.W.; Dahle, Helge Ketil et al. (1997). A characteristic domain splitting method. (external link)
• Dahle, Helge Ketil; Johansen, T.O.W.; Botnen, Tone et al. (1996). A characteristic domain decomposition method for modeling flow in a coastal aquifer. (external link)
• Tai, Xue-Cheng; Johansen, Torbjørn O. W.; Dahle, Helge Ketil et al. (1996). A characteristic domain splitting method. (external link)

Academic article

• Gasda, Sarah Eileen; Nilsen, Halvor Møll; Dahle, Helge K. (2013). Impact of structural heterogeneity on upscaled models for large-scale CO2 migration and trapping in saline aquifers. (external link)
• Gasda, Sarah Eileen; Aavatsmark, Ivar; Stephansen, Annette et al. (2013). Upscaled modeling of CO2 injection with coupled thermal processes. (external link)
• du Plessis, Elsa; Nordbotten, Jan Martin; Gasda, Sarah et al. (2013). Influence of capillary pressure and trapping hysteresis on large-scale CO2 migration. (external link)
• Gray, William G.; Herrera, Paulo; Gasda, Sarah Eileen et al. (2012). Derivation of vertical equilibrium models for CO2 migration from pore scale equations. (external link)
• Nordbotten, Jan Martin; Flemisch, Bernd; Gasda, Sarah Eileen et al. (2012). Uncertainties in practical simulation of CO2 storage. (external link)
• Gasda, Sarah Eileen; Nilsen, Halvor Møll; Dahle, Helge K. et al. (2012). Effective models for CO2 migration in geological systems with varying topography. (external link)
• Nilsen, Halvor Møll; Herrera, Paulo; Ashraf, Seyed Meisam et al. (2011). Field-case simulation of CO2-plume migration using vertical-equilibrium models. (external link)
• Aker, Eyvind; Bjørnarå, Tore Ingvald; Braathen, Alvar et al. (2011). SUCCESS: SUbsurface CO2 storage–Critical elements and superior strategy. (external link)
• Klausen, Runhild Aae; Mundal, Sissel; Dahle, Helge K. (2011). BARYCENTRIC COORDINATE BASED MIXED FINITE ELEMENTS ON QUADRILATERAL/HEXAHEDRAL MESH. (external link)
• Nordbotten, Jan Martin; Dahle, Helge K. (2011). Impact of the capillary fringe in vertically integrated models for CO2 storage. (external link)
• Joekar-Niasar, V; Hassanizadeh, S. Majid; Dahle, Helge K. (2010). Non-equilibrium effects in capillarity and interfacial area in two-phase flow: dynamic pore-network modelling. (external link)
• Eikemo, Birgitte; Lie, Knut-Andreas; Eigestad, Geir Terje et al. (2009). Discontinuous Galerkin methods for advective transport in single-continuum models of fractured media. (external link)
• Hægland, Håkon; Assteerrawatt, A.; Dahle, Helge Ketil et al. (2009). Comparison of cell- and vertex-centered discretization methods for flow in a two-dimensional discrete-fracture–matrix system. (external link)
• Eigestad, Geir Terje; Dahle, Helge Ketil; Hellevang, Bjarte et al. (2009). Geological modeling and simulation of CO2 injection in the Johansen formation. (external link)
• Class, Holger; Dahle, Helge Ketil; Helmig, Rainer (2009). Preface. (external link)
• Class, Holger; Ebigbo, Anozie; Helmig, Rainer et al. (2009). A benchmark study on problems related to CO2 storage in geologic formations. Summary and discussion of the results. (external link)
• Nordbotten, Jan Martin; Celia, Michael A.; Dahle, Helge Ketil et al. (2008). On the definition of macroscale pressure for multiphase flow in porous media. (external link)
• Hægland, Håkon; Dahle, Helge Ketil; Eigestad, Geir Terje et al. (2007). Improved streamlines and time-of-flight for streamline simulation on irregular grids. (external link)
• Nordbotten, Jan Martin; Celia, Michael A.; Dahle, Helge Ketil et al. (2007). Interpretation of macroscale variables in Darcy's law. (external link)
• Khattri, Sanjay Kumar; Fladmark, Gunnar; Dahle, Helge Ketil (2006). Control Volume Finite Difference On Adaptive Meshes. (external link)
• Nordbotten, Jan Martin; Celia, Michael A.; Bachu, Stefan et al. (2005). Semi-Analytical Solution for CO2 Leakage through an Abandoned Well. (external link)
• Dahle, Helge Ketil; Celia, Michael A.; Hassanizadeh, S. Majid (2005). Bundle-of-tubes model for calculating dynamic effects in the capillary-pressure-saturation relationship. (external link)
• Aadland, Torbjørn; Aavatsmark, Ivar; Dahle, Helge Ketil (2004). Performance of a flux splitting scheme when solving the single-phase pressure equation discretized by MPFA. (external link)
• Nordhaug, Hans Fredrik; Celia, Michael A.; Dahle, Helge Ketil (2003). A pore network model for calculation of interfacial velocities. (external link)
• Berre, Inga; Dahle, Helge Ketil; Karlsen, Kenneth H. et al. (2002). A streamline front tracking method for two- and three-phase flow including capillary forces. (external link)
• Berre, Inga; Dahle, Helge Ketil; Karlsen, Kenneth H. et al. (2002). Time-of-flight + fast Marching + transport collapse: an alternative to streamlines for tow-phase porous media flow with capillary forces?. (external link)
• Hassanizadeh, S. Majid; Celia, Michael A.; Dahle, Helge Ketil (2001). Dynamic effect in the capillary pressure-saturation relationship and its impacts on unsaturated flow. (external link)
• Dahle, Helge Ketil; Karlsen, Kenneth Hvistendahl; Lie, Knut-A. et al. (2001). Corrected operator splitting for systems of convection-diffusion equations. (external link)
• Karlsen, Kenneth Hvistendahl; Lie, Knut-Andreas; Natvig, Jostein Roald et al. (2001). Operator splitting methods for systems of convection-diffusion equations: nonlinear error mechanisms and correction strategies. (external link)
• Wang, Hong; Dahle, Helge Ketil; Ewing, Richard E. et al. (1999). An ELLAM Scheme for advection-diffusion equations in two dimensions. (external link)
• Wang, Hong; Dahle, Helge Ketil; Ewing, Richard E. et al. (1999). An ELLAM Scheme for Advection-Diffusion Equations in Two Dimensions. (external link)
• Dahle, Helge Ketil; Celia, Michael A. (1999). A dynamic network model for two-phase immiscible flow. (external link)
• Brusdal, Kari; Dahle, Helge Ketil; Karlsen, Kenneth Hvistendahl et al. (1998). A study of the modelling error in two operator splitting algorithms f or porous media flow. (external link)
• Karlsen, Kenneth Hvistendahl; Brusdal, Kari; Dahle, Helge Ketil et al. (1998). The corrected operator splitting approach applied to a nonlinear advection-diffusion problem. (external link)
• Wang, Hong; Dahle, Helge Ketil; Espedal, Magne et al. (1998). An ELLAM scheme for advection-dispersion equations in two dimensions. (external link)
• Kvam, Gunnar; Dahle, Helge Ketil; Nordrehaug, J.E. et al. (1997). The shortening fraction of myocardial fibers and its layered distribution, as derived from cine-MR imaged left ventriculograms - An approach for evaluating globar left ventricular function. (external link)
• Karlsen, Kenneth Hvistendahl; Brusdal, Kari; Dahle, Helge Ketil et al. (1997). The corrected operator splitting approach to a nonlinear advection-diffusion problem. (external link)
• Våg, Jan Einar; Wang, Hong; Dahle, Helge Ketil (1996). Eulerian-Lagrangian localized adjoint methods for systems of nonlinear advective-diffusive-reactive equations. (external link)
• Dahle, Helge Ketil; Ewing, Richard E.; Russell, Thomas F. (1995). Eulerian-Lagrangian localized adjoint methods for a nonlinear advection-diffusion equation. (external link)

Reader opinion piece

• Berre, Inga; Dahle, Helge K.; Karlsen, Kenneth Hvistendahl et al. (2012). Magne Espedal Memorial Issue. (external link)

Other

• Gasda, Sarah Eileen; Nilsen, Halvor Møll; Dahle, Helge K. (2012). Upscaled models for CO2 migration in geological formations with structural heterogeneity. (external link)
• Ask, Ann K.; Dahle, Helge K.; Karlsen, Kenneth Hvistendahl et al. (2000). A Local Streamline Eulerian-Lagrangian Method for Two-Phase Flow. (external link)
• Nordhaug, Hans Fredrik; Dahle, Helge K.; Espedal, Magne et al. (2000). Two phase flow including interfacial area as a variable. (external link)

Masters thesis

• Mykkeltvedt, Trine; Dahle, Helge K.; Nordbotten, Jan Martin (2010). Modeling dissolution within vertically averaged formulations. (external link)
• El-Faour, Bassel; Dahle, Helge K.; Nordbotten, Jan Martin et al. (2010). On the use of vertically averaged models to simulate CO2 migration in a layered saline aquifer. (external link)

Feature article

• Nordbotten, Jan Martin; Dahle, Helge Ketil (2008). Utopiske Greenpeace. (external link)

Report

• Binning, Philip; Engesgaard, Peter; Dahle, Helge Ketil et al. (2006). Proceedings of the XVI International Conference on Computational Methods in Water Resources. (external link)
• Dahle, Helge Ketil; Celia, Michael A.; Hassanizadeh, S. Majid (2003). Bundle-of-Tubes Model for Calculating Dynamic Effects in the Capillary-Pressure-Saturation relationship. (external link)
• Brusdal, Kari; Dahle, Helge Ketil; Karlsen, Kenneth Hvistendahl et al. (1997). A study of the modelling error in two operator splitting algorithms for porous media flow. (external link)
• Dahle, Helge Ketil; Oien, Alf (1995). ELLAM-based operator splitting for nonlinear advection diffusion equations. (external link)
• Dahle, Helge Ketil (1988). Adaptive characteristic operator splitting techniques for convectiondominated diffusion problems in one and two space dimensions. (external link)

Article in business/trade/industry journal

• Aavatsmark, Ivar; Dahle, Helge K. (2004). Performance of a flux splitting scheme when solving the single-phase pressure equation discretized by MPFA. (external link)

Popular scientific article

• Dahle, Helge Ketil (2002). Grunnvatn og matematikk. (external link)

Popular scientific lecture

• Dahle, Helge Ketil (1998). An Algorithm for Simulating Dynamic Effects in a Pore Scale Network Model of Two Phase Flow. (external link)

Thesis at a second degree level

• Dahle, Helge Ketil (1985). Trykkeffektar på tearingmoden: Ein kollisjonsdominert to-væske modell. (external link)

See a complete overview of publications in Cristin.