Browsing NTNU Open by Author "Møyner, Olav"
Now showing items 1-20 of 20
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A fully implicit WENO scheme on stratigraphic and unstructured polyhedral grids
Lie, Knut-Andreas; Mykkeltvedt, Trine Solberg; Møyner, Olav (Journal article; Peer reviewed, 2019)Many authors have used higher-order spatial discretizations to reduce numerical diffusion, which can be particularly pronounced when simulating EOR processes involving active chemical substances that are transported by ... -
A General Nonlinear Reservoir Simulator with the Full Approximation Scheme
Toft, Raymond (Master thesis, 2018)Simulation of multiphase flow and transport in porous rock formations gives rise to large systems of strongly coupled nonlinear equations. Solving these equations is computationally challenging because of orders of magnitude ... -
A Mass-Conservative Sequential Implicit Multiscale Method for General Compositional Problems
Møyner, Olav; Tchelepi, Hamdi (Journal article; Peer reviewed, 2018)Compositional simulation is necessary for a wide variety of reservoir-simulation applications, and it is especially valuable for accurate modeling of near-miscible gas injection for enhanced oil recovery. Because the ... -
Accelerated Smoothing and Construction of Prolongation Operators for the Multiscale Restricted-Smoothed Basis Method on Distributed Memory Systems
Johannessen, Fredrik (Master thesis, 2016)During the last two decades, several multiscale solvers have been developed in an attempt to reduce the computational cost of reservoir simulations. One such method is the recently proposed and promising multiscale ... -
Accelerating multiscale simulation of complex geomodels by use of dynamically adapted basis functions
Klemetsdal, Øystein; Møyner, Olav; Lie, Knut-Andreas (Journal article; Peer reviewed, 2019)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 ... -
Efficient reordered nonlinear Gauss–Seidel solvers with higher order for black-oil models
Klemetsdal, Øystein Strengehagen; Rasmussen, Atgeirr Flø; Møyner, Olav; Lie, Knut-Andreas (Journal article; Peer reviewed, 2019)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 ... -
Enhanced multiscale restriction-smoothed basis (MsRSB) preconditioning with applications to porous media flow and geomechanics
Bosma, Sebastian B.M.; Klevtsov, Sergey; Møyner, Olav; Castelletto, Nicola (Peer reviewed; Journal article, 2021)A novel method to enable application of the Multiscale Restricted Smoothed Basis (MsRSB) method to non M-matrices is presented. The original MsRSB method is enhanced with a filtering strategy enforcing M-matrix properties ... -
Evaluating thermal losses and storage capacity in high-temperature aquifer thermal energy storage (HT-ATES) systems with well operating limits: insights from a study-case in the Greater Geneva Basin, Switzerland
Collignon, Marine; Klemetsdal, Øystein Strengehagen; Møyner, Olav; Alcanié, Marion; Rinaldi, Antonio Pio; Nilsen, Halvor Møll; Lupi, Matteo (Peer reviewed; Journal article, 2020)High-temperature aquifer thermal energy storage (HT-ATES) may play a key role in the development of sustainable energies and thereby in the overall reduction of CO2 emission. To this end, a thorough understanding of the ... -
Full Approximation Scheme for Reservoir Simulation
Toft, Raymond; Lie, Knut-Andreas; Møyner, Olav (Journal article; Peer reviewed, 2018)Simulation of multiphase flow and transport in porous rock formations give rise to large systems of strongly coupled nonlinear equations. Solving these equations is computationally challenging because of orders of magnitude ... -
Grid Orientation Effects and Consistent Discretizations for Simulation of Geologic Carbon Storage: A Study of the SPE11 Benchmark
Holme, Kristian (Master thesis, 2024)Denne oppgaven utforsker hvordan forskjellige grid-typer og diskretiseringsmetoder påvirker simuleringen av geologisk lagring av karbondioksid i akviferer med kompleks geometri. Med utgangspunkt i SPE11, en benchmark-beskrivelse ... -
Investigating iterative solvers of Poisson-type equations discretized by the Two-Point Flux-Approximation scheme
Mona-Lena Norheim (Master thesis, 2019)I denne masteroppgaven ser vi på alternative iterative løsere til MATLABs innebygde direkte løser \texttt{mldivide} for Poisson-type problemer. Løserene er testet på to forskjellige modeller som er vanlig å bruke for ... -
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, ... -
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 domain decomposition scheme for sequential fully implicit formulation of compositional multiphase flow
Møyner, Olav; Moncorge, A (Journal article; Peer reviewed, 2019)New sequential fully implicit (SFI) methods for compositional flow simulation have been recently investigated. These SFI schemes decouple the fully coupled problem into separate pressure and transport problems and have ... -
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 ... -
Nonlinear Two-Point Flux Approximation Schemes for Reservoir Simulation
Heigrestad, Pia-Kristina (Master thesis, 2018)The main objective of this thesis has been to investigate some methods for simulating CO2 storage and hydrocarbon recovery on complex polyhedral grids, with main focus on the nonlinear two-point flux approximation method. ... -
PRST - Python Reservoir Simulation Toolbox
Røssland, Andreas Amlien (Master thesis, 2016)In this thesis I have developed a prototype for a software framework for the simulation of flow in porous media, based on the MATLAB Reservoir Simulation Toolkit (MRST). The software -- Python Reservoir Simulation Toolkit ... -
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, ... -
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 ...