Forskergrupper
- Porous Media Group
- Center for Modeling of Coupled Subsurface Dynamics
- CENTRE FOR SUSTAINABLE SUBSURFACE RESOURCES
Kort info
Forskning
Eg har forska på matematisk og numerisk modellering av strøymingsprosessar i porøse medium. Ei hovudinteresse har vore å forstå korleis vi kan skalere opp slike prosessar frå pore-skala (mikrometer) til kontinuums-skala (centimeter) og vidare til feltskala (kilometer). Spesielt har eg vore oppteken av prosessar på pore-skala som kan gi opphav til ikkje-likevekt effektar i lukkings-relasjonar («constitutive relationships») i kontinuums-skala modellar. Eg har også arbeidd med å forstå og utvikle Lagranske numeriske metodar for ikkje-lineære adveksjons dominerte transport prosessar.
Behovet for å utvikle praktiske løysingar som kan bidra til å utslepp av klima-gassar har dreia forskinga mi mot geologisk lagring av CO2-gass (som i CCS= Carbon Capture and Storage). Eg har leia og delteke i fleire større prosjekt som har studert modellering og simulering av lagring av CO2-gass i undersjøiske akviferar. Spesielt har vi sett på korleis vi kan modellere oppførselen til enorme mengder superkritisk CO2-gass som blir pumpa inn i slike undersjøiske reservoar fylt med saltvatn. Eit hovudmål har vore å utvikle effektive simuleringsmetodar som kan nyttast i risiko-vurdering av CO2-lagring. Dei siste åra har eg arbeidd med simuleringsteknologi som kan nyttast til å modellere effekten av CO2-lagring på regional skala som kan involvere mange injeksjons-lisensar.
I perioden 2005 til 2010 var eg nestleiar og fungerande instituttleiar ved Matematisk institutt. Frå 2010 til 2013 var eg visedekan for utdanning ved Det Matematisk-Naturvitskapelege Fakultet (no Fakultet for Naturvitskap og Teknologi), og frå 2013 til 2021 var eg dekan ved same fakultet. Etter å ha hatt tunge administrative verv har eg dei siste åra forsøkt å rehabilitere meg som utdannar og forskar.
Undervisning
Eg har lang erfaring som underviser og vegleiar ved Matematisk Institutt. Eg har undervist kurs på alle nivå ved instituttet og har hatt stort ansvar for innføringskursa i matematikk. Etter perioden som dekan har eg undervist Differensiallikningar (Mat 131) og Funksjonar av fleire variable (Mat 212).
Stort fråfall er eit problem i høgare utdanning. Det er mange grunnar til dette, men læringsforsking og erfaring frå sentre for framifrå utdanning (SFU) viser at vi har ei solid verktøykasse for å redusere fråfallet dersom vi er villige til å bruke den. Eit viktig mål er så klart å fjerne unødvendig fråfall, samstundes som studentane lærer meir.
Dei siste åra har eg henta idear frå "Team Based Learning" i undervisninga mi i matematikk for å betre gjennomføringa i desse kursa. Dette er gjennomført i samarbeid med SERC-senteret (Stem Education Resarch Centre) ved fakultet. Eg har også eksperimentert med vurderingsformer i undervisninga. Eg er overtydd om at korleis vi vurderer studentane er essensielt for læring.
Publikasjoner
Konferanseforedrag
- Helge Ketil Dahle; Michael A. Celia; S. Majid Hassanizadeh (2003). A Bundle of Capillary Tubes Model to Investigate Dynamic Effects in the Capillary-Pressure-Saturation Relationship. (ekstern lenke)
- Sarah Eileen Gasda; Odd Andersen; Halvor Møll Nilsen et al. (2013). Coupled Thermal Models with Vertical Equilibrium for CO2 storage. (ekstern lenke)
- Bjørn-Ove Heimsund; Helge Ketil Dahle; Magne Espedal (2004). Adjoint methods are particle methods: Implications for Eulerian-Langrangian modeling of multiphase multicomponent transport. (ekstern lenke)
- Helge Ketil Dahle (2002). A total pressure-saturation formulation of two-phase flow incorperating dynamic effects in the capillary-pressure-saturation relationship. (ekstern lenke)
- Helge Ketil Dahle (2004). Dynamic Effects in Constitutive Relationships for Two-Phase Flow in Porous Media: Insights From and About Bundle of Tubes Models. (ekstern lenke)
- Xue-Cheng Tai; O.W. Johansen; Helge Ketil Dahle et al. (1997). A characteristic domain splitting method. (ekstern lenke)
- Hans Fredrik Nordhaug; Helge Ketil Dahle; Magne Espedal et al. (2000). Two phase flow including interfacial area as a variable. (ekstern lenke)
- Bjørn-Ove Heimsund; Helge Ketil Dahle; Magne Espedal (2003). Eulerian-Lagrangian methods for non-linear advection problems. (ekstern lenke)
- Xue-Cheng Tai; Torbjørn O. W. Johansen; Helge Ketil Dahle et al. (1996). A characteristic domain splitting method. (ekstern lenke)
- M.A. Celia; P.C. Reeves; Helge Ketil Dahle (1998). On the use of pore-scale computational models for two-phase porous media flows. (ekstern lenke)
- Sarah Eileen Gasda; Halvor Møll Nilsen; Helge K. Dahle et al. (2012). Effective models for CO2 migration in geological systems with varying topography. (ekstern lenke)
- Sarah Eileen Gasda; Helge K. Dahle; Jan Martin Nordbotten et al. (2013). Quantifying storage capacity using upscaled models for CO2 storage. (ekstern lenke)
- Twan Gielen; S. Majid Hassanizadeh; Michael A. Celia et al. (2004). A pore-scale network approach to investifate dynamic effects in multiphase flow. (ekstern lenke)
- Helge Ketil Dahle; M. Celia; Kenneth Hvistendahl Karlsen (1997). Combining the corrected operator splitting method with streamline computation to solve nonlinear advection-diffusion equations. (ekstern lenke)
- Helge Ketil Dahle; Hans Fredrik Nordhaug; William G. Gray et al. (2000). A Two Phase Flow Model Including Dynamics of Interfacial Area. (ekstern lenke)
- Michael A. Celia; Helge Ketil Dahle; S. Majid Hassanizadeh (2000). Dynamic pore-scale network models for two-phase flow in porous media. (ekstern lenke)
- Ann K. Ask; Helge Ketil Dahle; Kenneth Hvistendahl Karlsen et al. (2000). A local streamline Eulerian-Lagrangian method for two-phase flow. (ekstern lenke)
- Sarah Eileen Gasda; Ivar Aavatsmark; Annette F. Stephansen et al. (2013). Upscaled modeling of CO2 injection with coupled thermal processes. (ekstern lenke)
- Helge Ketil Dahle (2002). Study of Pc-Sw relationship using a dynamic pore-scale network model. (ekstern lenke)
- Håkon Hægland; Helge Ketil Dahle; Ivar Aavatsmark et al. (2006). Adaptive streamline tracing for streamline simulation on irregular grids. (ekstern lenke)
- Sarah Eileen Gasda; Halvor Møll Nilsen; Helge K. Dahle (2012). Upscaled models for CO2 migration in geological formations with structural heterogeneity. (ekstern lenke)
- Sarah Eileen Gasda; Helge K. Dahle; Halvor Møll Nilsen (2012). Upscaled models for CO2 migration. (ekstern lenke)
- Michael A. Celia; Stefan Bachu; Jan Martin Nordbotten et al. (2004). Quantitative estimation of CO2 leakage from geological storage: Analytical models, numerical models, and data needs. (ekstern lenke)
- Kenneth Hvistendahl Karlsen; Helge Ketil Dahle; J. Frøyen et al. (1997). Corrected operator splitting for nonlinear advection-diffusion. (ekstern lenke)
- Håkon Hægland; Knut-Andreas Lie; Helge Ketil Dahle et al. (2006). Adaptive Streamline Tracing for Streamline Simulation on Irregular Grids. (ekstern lenke)
- Jan Martin Nordbotten; Michael A. Celia; Helge Ketil Dahle et al. (2006). On the definition of macro-scale pressure for multi-phase flow in porous media. (ekstern lenke)
- Helge Ketil Dahle (2002). Time-of-flight+transport collapse: An alternative to streamlines for two-phase porous media flow with capillary forces. (ekstern lenke)
- Michael A. Celia; Helge Ketil Dahle; S. Majid Hassanizadeh (2004). Dynamic Effects in Capillary Pressure Relationships for Two-phase Flow in Porous Media: Insights from Bundle-of-Tubes Models and their Implications. (ekstern lenke)
- Xue-Cheng Tai; Helge Ketil Dahle; Magne Espedal (1997). Identification of the discontinuios permability of a one phase flow reservoir by Petrov-Galerkin method. (ekstern lenke)
- Helge Ketil Dahle (1997). Numerisk modellering av strømning i grunnvannsreservoar. (ekstern lenke)
- Helge Ketil Dahle; M. Celia; M. Hassanizadeh (1997). A dynamic algorithm for simulating two-phase flow in a pore-scale network model. (ekstern lenke)
- Birgitte Eikemo; Inga Berre; Helge Ketil Dahle et al. (2006). A Discontinuous Galerkin Method for Computing Time-of-Flight in Discrete-Fracture Models. (ekstern lenke)
- Hans Fredrik Nordhaug; Ann K. Ask; Helge Ketil Dahle et al. (2000). A Sketch: Solving a Multidimensional Three Phase Flow Problem. (ekstern lenke)
- Inga Berre; Helge Ketil Dahle; Kenneth Hvistendahl Karlsen et al. (2002). A streamline front-tracking method for two- and three-phase flow including capillary forces. (ekstern lenke)
- Håkon Hægland; Michael A. Celia; Helge Ketil Dahle et al. (2006). Streamline methods on fault adapted grids for risk assessment of storage of CO2 in geological formations. (ekstern lenke)
- Helge Ketil Dahle; T.O.W. Johansen; Tone Botnen et al. (1996). A characteristic domain decomposition method for modeling flow in a coastal aquifer. (ekstern lenke)
Populærvitenskapelig artikkel
Vitenskapelig bokkapittel
- Sarah Eileen Gasda; Elsa du Plessis; Helge K. Dahle (2013). Upscaled models for CO2 injection and migration in geological systems. (ekstern lenke)
- Helge Ketil Dahle; Torbjørn Ole Widnes Johansen; Tone Botnen et al. (1998). A characteristic domain decomposition method for modelling the flow in a coastal aquifer. (ekstern lenke)
- Sarah Eileen Gasda; Tor Harald Sandve; Svenn Tveit et al. (2024). Quantifying the Impact of Regional-Scale Pressure Interference on Commercial CO2 Storage Targets for Multiple Licenses. (ekstern lenke)
- Sarah Eileen Gasda; William Gray; Helge K. Dahle (2014). Vertically integrated models with coupled thermal processes. (ekstern lenke)
Vitenskapelig artikkel
- Kenneth Hvistendahl Karlsen; Knut-Andreas Lie; Jostein Roald Natvig et al. (2001). Operator splitting methods for systems of convection-diffusion equations: nonlinear error mechanisms and correction strategies. (ekstern lenke)
- Helge Ketil Dahle; Michael A. Celia; S. Majid Hassanizadeh (2005). Bundle-of-tubes model for calculating dynamic effects in the capillary-pressure-saturation relationship. (ekstern lenke)
- Jan Martin Nordbotten; Michael A. Celia; Stefan Bachu et al. (2005). Semi-Analytical Solution for CO2 Leakage through an Abandoned Well. (ekstern lenke)
- Holger Class; Anozie Ebigbo; Rainer Helmig et al. (2009). A benchmark study on problems related to CO2 storage in geologic formations. Summary and discussion of the results. (ekstern lenke)
- Hong Wang; Helge Ketil Dahle; Richard E. Ewing et al. (1999). An ELLAM Scheme for advection-diffusion equations in two dimensions. (ekstern lenke)
- Runhild Aae Klausen; Sissel Mundal; Helge K. Dahle (2011). BARYCENTRIC COORDINATE BASED MIXED FINITE ELEMENTS ON QUADRILATERAL/HEXAHEDRAL MESH. (ekstern lenke)
- Sarah Eileen Gasda; Ivar Aavatsmark; Annette Stephansen et al. (2013). Upscaled modeling of CO2 injection with coupled thermal processes. (ekstern lenke)
- Jan Einar Våg; Hong Wang; Helge Ketil Dahle (1996). Eulerian-Lagrangian localized adjoint methods for systems of nonlinear advective-diffusive-reactive equations. (ekstern lenke)
- Geir Terje Eigestad; Helge Ketil Dahle; Bjarte Hellevang et al. (2009). Geological modeling and simulation of CO2 injection in the Johansen formation. (ekstern lenke)
- Kenneth Hvistendahl Karlsen; Kari Brusdal; Helge Ketil Dahle et al. (1997). The corrected operator splitting approach to a nonlinear advection-diffusion problem. (ekstern lenke)
- Elsa du Plessis; Jan Martin Nordbotten; Sarah Gasda et al. (2013). Influence of capillary pressure and trapping hysteresis on large-scale CO2 migration. (ekstern lenke)
- Hong Wang; Helge Ketil Dahle; Richard E. Ewing et al. (1999). An ELLAM Scheme for Advection-Diffusion Equations in Two Dimensions. (ekstern lenke)
- Håkon Hægland; Helge Ketil Dahle; Geir Terje Eigestad et al. (2007). Improved streamlines and time-of-flight for streamline simulation on irregular grids. (ekstern lenke)
- Inga Berre; Helge Ketil Dahle; Kenneth H. Karlsen et al. (2002). A streamline front tracking method for two- and three-phase flow including capillary forces. (ekstern lenke)
- Inga Berre; Helge Ketil Dahle; Kenneth H. Karlsen et al. (2002). Time-of-flight + fast Marching + transport collapse: an alternative to streamlines for tow-phase porous media flow with capillary forces?. (ekstern lenke)
- William G. Gray; Paulo Herrera; Sarah Eileen Gasda et al. (2012). Derivation of vertical equilibrium models for CO2 migration from pore scale equations. (ekstern lenke)
- Helge Ketil Dahle; Richard E. Ewing; Thomas F. Russell (1995). Eulerian-Lagrangian localized adjoint methods for a nonlinear advection-diffusion equation. (ekstern lenke)
- Jan Martin Nordbotten; Michael A. Celia; Helge Ketil Dahle et al. (2007). Interpretation of macroscale variables in Darcy's law. (ekstern lenke)
- Jan Martin Nordbotten; Bernd Flemisch; Sarah Eileen Gasda et al. (2012). Uncertainties in practical simulation of CO2 storage. (ekstern lenke)
- Jan Martin Nordbotten; Helge K. Dahle (2011). Impact of the capillary fringe in vertically integrated models for CO2 storage. (ekstern lenke)
- Helge Ketil Dahle; Kenneth Hvistendahl Karlsen; Knut-A. Lie et al. (2001). Corrected operator splitting for systems of convection-diffusion equations. (ekstern lenke)
- Gunnar Kvam; Helge Ketil Dahle; J.E. Nordrehaug 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. (ekstern lenke)
- Kenneth Hvistendahl Karlsen; Kari Brusdal; Helge Ketil Dahle et al. (1998). The corrected operator splitting approach applied to a nonlinear advection-diffusion problem. (ekstern lenke)
- Jan Martin Nordbotten; Michael A. Celia; Helge Ketil Dahle et al. (2008). On the definition of macroscale pressure for multiphase flow in porous media. (ekstern lenke)
- Sarah Eileen Gasda; Halvor Møll Nilsen; Helge K. Dahle (2013). Impact of structural heterogeneity on upscaled models for large-scale CO2 migration and trapping in saline aquifers. (ekstern lenke)
- Birgitte Eikemo; Knut-Andreas Lie; Geir Terje Eigestad et al. (2009). Discontinuous Galerkin methods for advective transport in single-continuum models of fractured media. (ekstern lenke)
- Sanjay Kumar Khattri; Gunnar Fladmark; Helge Ketil Dahle (2006). Control Volume Finite Difference On Adaptive Meshes. (ekstern lenke)
- Hans Fredrik Nordhaug; Michael A. Celia; Helge Ketil Dahle (2003). A pore network model for calculation of interfacial velocities. (ekstern lenke)
- Torbjørn Aadland; Ivar Aavatsmark; Helge Ketil Dahle (2004). Performance of a flux splitting scheme when solving the single-phase pressure equation discretized by MPFA. (ekstern lenke)
- Sarah Eileen Gasda; Halvor Møll Nilsen; Helge K. Dahle et al. (2012). Effective models for CO2 migration in geological systems with varying topography. (ekstern lenke)
- Helge Ketil Dahle; Michael A. Celia (1999). A dynamic network model for two-phase immiscible flow. (ekstern lenke)
- Hong Wang; Helge Ketil Dahle; Magne Espedal et al. (1998). An ELLAM scheme for advection-dispersion equations in two dimensions. (ekstern lenke)
- Halvor Møll Nilsen; Paulo Herrera; Seyed Meisam Ashraf et al. (2011). Field-case simulation of CO2-plume migration using vertical-equilibrium models. (ekstern lenke)
- V Joekar-Niasar; S. Majid Hassanizadeh; Helge K. Dahle (2010). Non-equilibrium effects in capillarity and interfacial area in two-phase flow: dynamic pore-network modelling. (ekstern lenke)
- Kari Brusdal; Helge Ketil Dahle; Kenneth Hvistendahl Karlsen et al. (1998). A study of the modelling error in two operator splitting algorithms f or porous media flow. (ekstern lenke)
- Håkon Hægland; A. Assteerrawatt; Helge Ketil Dahle et al. (2009). Comparison of cell- and vertex-centered discretization methods for flow in a two-dimensional discrete-fracture–matrix system. (ekstern lenke)
- Holger Class; Helge Ketil Dahle; Rainer Helmig (2009). Preface. (ekstern lenke)
- S. Majid Hassanizadeh; Michael A. Celia; Helge Ketil Dahle (2001). Dynamic effect in the capillary pressure-saturation relationship and its impacts on unsaturated flow. (ekstern lenke)
- Eyvind Aker; Tore Ingvald Bjørnarå; Alvar Braathen et al. (2011). SUCCESS: SUbsurface CO2 storage–Critical elements and superior strategy. (ekstern lenke)
Fremhevet artikkel i media
Forelesning
- Helge K. Dahle (2012). Kan CO2-lagring på lange tidsskalaer modelleres?. (ekstern lenke)
- Helge Ketil Dahle (1998). An Algorithm for Simulating Dynamic Effects in a Pore Scale Network Model of Two Phase Flow. (ekstern lenke)
- Sarah Eileen Gasda; William Gray; Helge K. Dahle (2014). Vertically integrated models with coupled thermal processes. (ekstern lenke)
Konferanseposter
- Hans Fredrik Nordhaug; Michael A. Celia; Helge Ketil Dahle (2000). Two Phase Flow, Interfacial Area and Dynamic Network Modeling. (ekstern lenke)
- Kari Brusedal; Helge Ketil Dahle; Kenneth Hvistendahl Karlsen et al. (1997). Operator splitting and an inverse problem for the Buckley-Leverett equation. (ekstern lenke)
- Håkon Hægland; Helge Ketil Dahle; Geir Terje Eigestad et al. (2006). Streamline methods on grids adapting to fractures. (ekstern lenke)
- Åsmund van Brussel Synnevåg; Wietse Boon; Florin Adrian Radu et al. (2025). Robin-Type boundary term for Richards Flow-A non-overlapping domain decomposition approach with mixed formulation for solving flow in partially saturated porous media. (ekstern lenke)
- Helge Ketil Dahle; Hans Fredrik Nordhaug; Michael A. Celia et al. (2000). A Two Phase Flow Model Including Dynamics of Interfacial Areas. (ekstern lenke)
- Eda Onal; Eirik Keilegavlen; Helge K. Dahle et al. (2024). Coupling Strategies in Large-Scale Simulations of CO2 Storage. (ekstern lenke)
- Sanjay Kumar Khattri; Gunnar E Fladmark; Helge Ketil Dahle (2004). Numerics of CO2 sequestration. (ekstern lenke)
- Åsmund van Brussel Synnevåg; Wietse Boon; Florin Adrian Radu et al. (2025). Robin-Type boundary term for Richards Flow-A non-overlapping domain decomposition approach with mixed formulation for solving flow in partially saturated porous media. (ekstern lenke)
- Jan Martin Nordbotten; Michael A. Celia; Stefan Bachu et al. (2004). Similarity solutions for CO2 injection in aquifers. (ekstern lenke)
- Hans Fredrik Nordhaug; Michael A. Celia; Helge Ketil Dahle (2000). Two phase flow: Two coupled equations for interfacial area and saturation. (ekstern lenke)
Forskningsrapport
- Helge Ketil Dahle; Michael A. Celia; S. Majid Hassanizadeh (2003). Bundle-of-Tubes Model for Calculating Dynamic Effects in the Capillary-Pressure-Saturation relationship. (ekstern lenke)
- Philip Binning; Peter Engesgaard; Helge Ketil Dahle et al. (2006). Proceedings of the XVI International Conference on Computational Methods in Water Resources. (ekstern lenke)
- Helge Ketil Dahle (1988). Adaptive characteristic operator splitting techniques for convectiondominated diffusion problems in one and two space dimensions. (ekstern lenke)
- Helge Ketil Dahle; Alf Oien (1995). ELLAM-based operator splitting for nonlinear advection diffusion equations. (ekstern lenke)
- Kari Brusdal; Helge Ketil Dahle; Kenneth Hvistendahl Karlsen et al. (1997). A study of the modelling error in two operator splitting algorithms for porous media flow. (ekstern lenke)
Doktorgradsavhandling
- Inga Berre; Helge Ketil Dahle; Trond Mannseth et al. (2005). Fast Simulation of Transport and Adaptive Permeability Estimation in Porous Media. (ekstern lenke)
- Nematollah Zamani; Arne Skauge; Helge K. Dahle et al. (2015). Pore Scale Modeling of Polymer Flow Using the Navier-Stokes Approach. (ekstern lenke)
- Helge K. Dahle (1989). Adaptive characteristic operator splitting techniques for convection-dominated diffusion problems in one and two space dimensions. (ekstern lenke)
Masteroppgave
- Bassel El-Faour; Helge K. Dahle; Jan Martin Nordbotten et al. (2010). On the use of vertically averaged models to simulate CO2 migration in a layered saline aquifer. (ekstern lenke)
- Helge Ketil Dahle (1985). Trykkeffektar på tearingmoden: Ein kollisjonsdominert to-væske modell. (ekstern lenke)
- Trine Mykkeltvedt; Helge K. Dahle; Jan Martin Nordbotten (2010). Modeling Dissolution within Vertically Averaged Formulations. (ekstern lenke)
Prosjekter
Project management 2005-
- Project leader (together with Bjørn Kvamme) Safe long terms storage of CO2 in aquifers (Financed by The Research Council of Norway, Statoil and Norsk Hydro, ca. 13 MNoK, 2003-2006)
- Project leader for the project Geological storage of CO2: Mathmatical Modelling and Risk Assessment (MatMoRA) (KMB-project Financed by The Research Council of Norway, Statoil, Norske Shell, and Norsk Hydro, ca. 20 MNoK, 2007-2011)
- Project leader Development and analysis of Vertically Averaged Models in Porous Media (VAMP) (Financed by The Research Council of Norway, ca. 4 MNoK, 2010-13)
- Project leader for the project Geological storage of CO2: Mathmatical Modelling and Risk Assessment (MatMoRA-II) (Partners: UiB, Uni Research, SINTEF IKT, NGI) KPN-project Financed by The Research Council of Norway and Statoil, ca. 21 MNoK, 2012-2015)
- Project leader for the project International Research Training group NUPUS Non-linearities and Upscaling in Porous Media Flow This is the Norwegian part of an international research school with main partners at University of Stuttgart and University of Utrecht (Researcher project financed by CLIMIT, ca. 1.2 MNoK).
Project member 2005-
- Direct Reservoir Simulation on Geocellular Models (Geoscale, 2004-2007),
- Centre for Integrated petroleum Research (Cipr, 2002-2012),
- SUbsurface CO2 storage - Critical Elements and Superior Strategy (Success, 2010-2018),
- Non-linearities and upscaling in porous media (Nupus, 2011-2015)
- Expansion of Resources for CO2 Storage on the Horda Platform (ExpReCCS) (2022-2026)
- Multiscale Pressure-Stress Impacts on fault integrity for multi-site regional CO2 storage hubs (MuPSI) (2024-2027)