Blar i NTNU Open på forfatter "Klemetsdal, Øystein"
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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 ... -
Combining Gmsh and MRST - Developing software for more efficient grid creation in two dimensions
Berg, Andreas Bjelland (Bachelor thesis, 2022)Det kan være svært utfordrende å skape presise, nøyaktige grid-representasjoner av virkelige, kontinuerlige domener. Dette er spesielt sant når det kommer til modellering av geologiske formasjoner, ettersom de har en tendens ... -
Constrained Generation of Voronoi Meshes using Inscribed Sphere Distance
Husøy, Sondre (Master thesis, 2023)Voronoi meshes, also known as PEBI (Perpendicular Bisector) grids, have garnered considerable attention due to their ability to simplify the generation of general polygonal/polyhedral meshes. Constrained Voronoi meshes, ... -
Graph-based methods for data-driven reservoir modeling
Devold, Ingvild Strømsheim (Master thesis, 2023)Datadrevne metoder innen reservoarmodellering inkluderer både fullt ut databaserte maskinlæringsmetoder og historietilpasning av tradisjonelle matematiske modeller. I denne oppgaven foreslår vi en type hybride, grafbaserte ... -
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 ... -
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, ... -
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 ... -
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 ...