Now showing items 1-20 of 299

    • An Open-Source Toolchain for Simulation and Optimization of Aquifer-Wide CO2 Storage 

      Andersen, Odd; Lie, Knut-Andreas; Nilsen, Halvor Møll (Elsevier Ltd., 2016-02-04)
      Planning and execution of large-scale, aquifer-wide CO2 storage operations will require extensive use of computer modelling and simulations. The required computational tools will vary depending on the physical characteristics ...
      Journal article
    • Oppfatningar og misoppfatningar i sannsyn: Ein mixed methods-studie av elevar på vidaregåande trinn – yrkesfagleg retning 

      Handegård, Tone (The University of Bergen, 2016-01)
      Denne masteroppgåva handlar om korleis elevar på vidaregåande trinn – yrkesfagleg retning forstår omgrep innafor sannsyn. Føremålet har vore å avdekkja kva oppfatningar og misoppfatningar elevane har og kva løysingsstrategiar ...
      Master thesis
    • Upscaling of Nonisothermal Reactive Porous Media Flow under Dominant Péclet Number: The Effect of Changing Porosity 

      Bringedal, Carina; Berre, Inga; Pop, Iulio Sorin; Radu, Florin A. (Society for Industrial and Applied Mathematics, 2016)
      Motivated by rock-fluid interactions occurring in a geothermal reservoir, we present a two-dimensional pore scale model of a thin strip consisting of void space and grains, with fluid flow through the void space. Ions in ...
      Journal article
    • Wave breaking in long wave models and undular bores 

      Brun, Mats Kirkesæther (The University of Bergen, 2015-12-18)
      Bores are a well known phenomena in fluid mechanics, although their occurrence in nature is relatively rare. The circumstances in which they occur is usually when a tidal swell causes a difference in surface elevation ...
      Master thesis
    • A robust linearization scheme for finite volume based discretizations for simulation of two-phase flow in porous media 

      Radu, Adrian Florin; Nordbotten, Jan Martin; Pop, Iuliu Sorin; Kumar, Kundan (Elsevier, 2015-12)
      In this work we consider a mathematical model for two-phase flow in porous media. The fluids are assumed immiscible and incompressible and the solid matrix non-deformable. The mathematical model for the two-phase flow is ...
      Journal article
    • Subsea pump vibration analysis for predictive maintenance 

      Rouzbahaneh, Mahdi (The University of Bergen, 2015-11-29)
      The goal of this study is to compare vibration signals of subsea pumps from two different time periods. These signals are gathered for predictive maintenance reasons. Vibration analysis is one of the most efficient tools ...
      Master thesis
    • A robust implicit scheme for two-phase flow in porous media 

      Kvashchuk, Anna (The University of Bergen, 2015-11-26)
      In this thesis we present a new implicit scheme for the numerical simulation of two-phase flow in porous media. Linear finite elements are considered for the spatial discretization. The scheme is based on the ...
      Master thesis
    • Heat Transfer Upscaling in Geothermal Reservoirs 

      Varzina, Anna (The University of Bergen, 2015-11-20)
      In this thesis we implement a numerical model of heat transfer in geothermal reservoirs. We use existing pressure and flow transport solvers as a starting point to investigate discretization techniques for a ...
      Master thesis
    • Convergence of a Cell-Centered Finite Volume Discretization for Linear Elasticity 

      Nordbotten, Jan Martin (SIAM, 2015-11-19)
      We show convergence of a cell-centered finite volume discretization for linear elasticity. The discretization, termed the MPSA method, was recently proposed in the context of geological applications, where cell-centered ...
      Journal article
    • A Comparison of Anthropometric Measures for Assessing the Association between Body Size and Risk of Chronic Low Back Pain: TheHUNT Study 

      Heuch, Ingrid; Heuch, Ivar; Hagen, Knut; Zwart, John-Anker (PLOS, 2015-10-27)
      Background: Previous work indicates that overweight and obese individuals carry an increased risk of experiencing chronic low back pain (LBP). It is not known, however, how the association with body size depends on the ...
      Journal article
    • Analytical Methods for Upscaling of Fractured Geological Reservoirs 

      Sævik, Pål Næverlid (The University of Bergen, 2015-10-16)
      Numerical simulations have become an essential tool for planning well operations in the subsurface, whether the application is petroleum production, geothermal energy, groundwater utilization or waste disposal and leakage. ...
      Doctoral thesis
    • Algebra i første klasse 

      Lid, Elin Røkeberg (The University of Bergen, 2015-10-12)
      Oppgaven handler om algebra i første klasse. Hva er tidlig algebra og hvordan kan vi undervise på en slik måte at vi utvikler elevenes algebraiske tenkning? Tidlig algebra er ikke at vi underviser skolealgebra tidligere, ...
      Master thesis
    • Modeling of heat transfer in porous media in the context of geothermal energy extraction 

      Bringedal, Carina (The University of Bergen, 2015-10-02)
      This dissertation concerns mathematical modeling related to heat transfer in the subsurface relevant for geothermal energy extraction. Two applications are considered: First, natural convection in a homogeneous porous ...
      Doctoral thesis
    • Design of a monitoring program in a varying marine environment 

      Frøysa, Håvard Guldbrandsen (The University of Bergen, 2015-09-14)
      In this thesis we develop methods for optimal design of a monitoring program for offshore geological CO2 storage. The goal is to find the layout of fixed chemical sensors at the seafloor that maximizes the probability ...
      Master thesis
    • Ensemble Methods of Data Assimilation in Porous Media Flow for Non-Gaussian Prior Probability Density 

      Zhang, Yanhui (The University of Bergen, 2015-08-28)
      Ensemble-based data-assimilation methods have gained fast growth since the ensemble Kalman filter (EnKF) was introduced into the petroleum engineering. Many techniques have been developed to overcome the inherent disadvantages ...
      Doctoral thesis
    • Solution strategies for nonlinear conservation laws 

      Skogestad, Jan Ole (The University of Bergen, 2015-08-21)
      Nonlinear conservation laws form the basis for models for a wide range of physical phenomena. Finding an optimal strategy for solving these problems can be challenging, and a good strategy for one problem may fail spectacularly ...
      Doctoral thesis
    • Two-phase flow in porous media: dynamic capillarity and heterogeneous media 

      van Duijn, Cornelius J.; Cao, Xiulei; Pop, Iuliu Sorin (Springer, 2015-08-11)
      We investigate a two-phase porous media flow model, in which dynamic effects are taken into account in phase pressure difference. We consider a one-dimensional heterogeneous case, with two adjacent homogeneous blocks ...
      Journal article
    • The Whitham Equation as a model for surface water waves 

      Moldabayev, Daulet; Kalisch, Henrik; Dutykh, Denys (Elsevier, 2015-08)
      The Whitham equation was proposed as an alternate model equation for the simplified description of uni-directional wave motion at the surface of an inviscid fluid. As the Whitham equation incorporates the full linear ...
      Journal article
    • Non-standard shocks in the Buckley-Leverett equation 

      Kalisch, Henrik; Mitrovic, Darko; Nordbotten, Jan Martin (Elsevier, 2015-08)
      It is shown how delta shock waves which consist of Dirac delta distributions and classical shocks can be used to construct non-monotone solutions of the Buckley–Leverett equation. These solutions are interpreted using a ...
      Journal article
    • Numerical Modelling of Microbial Enhanced Oil Recovery with Focus on Dynamic Effects: An Iterative Approach 

      Skiftestad, Kai (Universitetet i Bergen (UiB), 2015-06-27)
      Recovering more of the available oil has been a main driver behind the extensive work done in the field of enhanced oil recovery (EOR) over the last decades. Microbial en- hanced oil recovery (MEOR) has been heavily ...
      Master thesis