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Knut-Andreas Lie

Chief Scientist

Knut-Andreas Lie

Chief Scientist

Knut-Andreas Lie
Phone: +47 930 58 721
Department: Mathematics and Cybernetics
Office: Oslo

Publications and responsibilities

Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1620078

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 alignment of cell centroids to accurately represent horizontal and multilateral wel...

Authors Berge Runar Lie Klemetsdal Øystein Lie Knut-Andreas
Year 2018
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1608380

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 use a restriction operator to construct a reduced system of flow equations on a ...

Authors Klemetsdal Øystein Møyner Olav Lie Knut-Andreas
Year 2018
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1608361

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 systems. We present a strategy to reduce computational time that relies on two k...

Year 2018
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1608321

Higher-order spatial discretization has been used by many authors to reduce numerical diffusion and mitigate grid-orientation effects. EOR processes are particularly susceptible to numerical diffusion, since the active chemical substances are often transported by linear or weakly nonlinear waves. Mo...

Authors Lie Knut-Andreas Mykkeltvedt Trine Solberg Møyner Olav
Year 2018
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1607795

Reactive transport in porous media with dissolution and precipitation has important applications in oil and gas industry and ground-water remediation. In this work, we present a simulation method for reactive flow in porous media of two salts that share an ion. The method consists of a front-trackin...

Authors Zefreh Masoud Ghaderi Nilsen Halvor Møll Lie Knut-Andreas Raynaud Xavier Doster Florian
Year 2018
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1595118

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, written as a tribute to Helge on his 60th birthday, I revisit the guidelines a...

Year 2018
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1594639

Equations modelling multiphase/multicomponent flow in porous media are widely studied by the hyperbolic community, e.g., as examples of problems with nonconvex and spatially-dependent flux. Various types of high-resolution methods have been developed to solve these equations, but few have managed to...

Year 2018
Type Conference lecture and academic presentation