Browsing NTNU Open by Author "Lie, Knut-Andreas"
Now showing items 21-40 of 40
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Microbial Enhanced Oil Recovery - Modeling and Numerical Simulations
Amundsen, Aleksander (Master thesis, 2015)This thesis examines the process by which microbes are used to enhance oil recovery from subsurface reservoirs. A brief introduction to reservoirs is given and the possible effects of microbes are explained. A model is ... -
Mimetic Finite Difference Method on GPU: Application in Reservoir Simulation and Well Modeling
Singh, Gagandeep (Master thesis, 2010)Heterogeneous and parallel computing systems are increasingly appealing to high-performance computing. Among heterogeneous systems, the GPUs have become an attractive device for compute-intensive problems. Their many-core ... -
Multiscale Finite Volume Methods: Extension to Unstructured Grids with Applications in Reservoir Simulation
Møyner, Olav (Master thesis, 2012)In reservoir simulations, one of the biggest challenges is solving large modelswith complex geological properties. Because reservoirs can be several kilome-ters long, and still be geologically inhomogeneous over centimeters, ... -
Multiscale-Streamline Inversion for High-Resolution Reservoir Models
Stenerud, Vegard (Doktoravhandlinger ved NTNU, 1503-8181; 2007:211, Doctoral thesis, 2007)The topic of this thesis is streamline-based integration of dynamic data for porous media systems, particularly in petroleum reservoirs. In the petroleum industry the integration of dynamic data is usually referred to as ... -
Next Generation Multiscale Methods for Reservoir Simulation
Møyner, Olav (Doctoral theses at NTNU;2016:374, Doctoral thesis, 2016)In this thesis, we discuss multiscale simulation techniques for flow and transport in porous media, discretized on unstructured grids. The model equations considered are taken from the field of reservoir simulation, where ... -
Non-linear Newton Solver for a Polymer Two-phase System Using Interface-localized Trust Regions
Klemetsdal, Øystein; Møyner, Olav; Lie, Knut-Andreas (Chapter, 2017)Models of polymer flooding account for several processes such as concentration dependent viscosity, adsorption, incomplete mixing, inaccessible pore space, and reduced permeability effects, which altogether gives strongly ... -
Nonlinear Gauss-Seidel solvers with higher order for black-oil models
Klemetsdal, Øystein; Rasmussen, Atgeirr Flø; Møyner, Olav; Lie, Knut-Andreas (Chapter, 2018)The fully implicit method is the most commonly used approach to solve black-oil problems in reservoir simulation. The method requires repeated linearization of large nonlinear systems and produces ill-conditioned linear ... -
On Holden's seven guidelines for scientific computing and development of open-source community software
Lie, Knut-Andreas (Chapter, 2018)Two decades ago, Helge Holden proposed seven guidelines to improve the way new achievements and results in scientific computing were presented, evaluated, and compared in contemporary scientific literature. In this essay, ... -
On Mimetic Finite Difference Methods for Grids with Curved Faces
Bø, Ruben Kristoffer Thomasse (Master thesis, 2012)In this thesis the mimetic finite difference method for grids with curved faces is presented, implemented and tested with an emphasis on applications in reservoir simulation. The thesis gives a brief introduction to reservoir ... -
Optimal non-linear solvers - Applications in reservoir simulation
Drejer, Svein Morten (Master thesis, 2014)This thesis starts by giving a general introduction to hydrocarbon reservoirs, before physical relations and mathematical tools used to model the flow of the fluid components in the porous media are presented. The resulting ... -
Quantum Error Mitigation for near-future Quantum Computation
Rokne, Anders Håøy (Master thesis, 2021)Kvantedatamaskiner har potensiale til å kunne løse spesifikke beregningsproblemer eksponentielt raskere enn noen klassisk datamaskin er i stand til. I nærliggende fremtid er derimot kvantedatamaskiner begrensede når det ... -
Robust nonlinear Newton solver with adaptive interface-localized trust regions
Klemetsdal, Øystein; Møyner, Olav; Lie, Knut-Andreas (Journal article; Peer reviewed, 2019)The interplay of multiphase flow effects and PVT behavior encountered in reservoir simulations often gives strongly coupled nonlinear systems that are challenging to solve numerically. In a sequentially implicit method, ... -
Simulations of CO2 Migration with a Fully-Integrated VE Model on the GPU
Seternes, Guro (Master thesis, 2015)The reduction of carbon dioxide emissions is becoming an increasing global priority and is the subject of many current research projects. One of the possible solutions is geological carbon storage, in which CO2 is captured ... -
Sparse linear algebra on a GPU: with Applications to flow in porous Media
Torp, Audun (Master thesis, 2009)We investigate what the graphics processing units (GPUs) have to offer compared to the central processing units (CPUs) when solving a sparse linear system of equations. This is performed by using a GPU to simulate fluid-flow ... -
Streamline-Based History Matching: A Review
Stenerud, Vegard Røine; Lie, Knut-Andreas (Research report, 2007)In recent years, several methods for streamline-based history matching have been developed. These methods have proved to be efficient for three reasons: First, streamlines delineate flow patterns and can therefore be used ... -
Towards a Parallel Multiphase Solver Based on Potential Ordering
Vikøren, Henrik (Master thesis, 2015)This thesis presents our work towards developing a parallel multiphase solver based on potential ordering. We begin the thesis by introducing the Fast Multiphase Solver, as developed by Natvig, Lie et al. . Then we, in ... -
Unstructured Voronoi grids conforming to lower-dimensional objects
Berge, Runar Lie; Klemetsdal, Øystein; Lie, Knut-Andreas (Journal article; Peer reviewed, 2018)We present a novel mixed-dimensional method for generating unstructured polyhedral grids that conform to prescribed geometric objects in arbitrary dimensions. Two types of conformity are introduced: (i) control-point ... -
Upscaling models of CO2 migration through low-permeable layers in porous media
Gaudet, Thibault Edward (Master thesis, 2020)In this thesis we investigate methods preserving the effects of thin layers of rock with low permeability on flow behaviour while upscaling geological models of porous media. More specifically, we study this upscaling in ... -
Upscaling of Water-Flooding Scenarios and Modeling of Polymer Flow
Hilden, Sindre Tonning (Doctoral thesis at NTNU;2016:12, Doctoral thesis, 2016)This thesis considers simulations of the fluid flow in petroleum reservoirs, and includes work on upscaling methods and on modeling of polymer flood- ing, which is a particular method of enhanced oil recovery. The details ... -
Use of dynamically adapted basis functions to accelerate multiscale simulation of complex geomodels
Klemetsdal, Øystein; Møyner, Olav; Lie, Knut-Andreas (Chapter, 2018)A number of different multiscale methods have been developed as a robust alternative to upscaling and as a means for accelerated reservoir simulation of high-resolution geomodels. In their basic setup, multiscale methods ...