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Knut-Andreas Lie

Research Manager / Chief Scientist

Knut-Andreas Lie

Research Manager / 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+1695587

This book provides a self-contained introduction to the simulation of flow and transport in porous media, written by a developer of numerical methods. The reader will learn how to implement reservoir simulation models and computational algorithms in a robust and efficient manner. The book contains a...

Year 2019
Type Book
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1695586

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 2019
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1695585

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 linear or weakly nonlinear waves. Most high-resolution methods reported in the li...

Authors Lie Knut-Andreas Mykkeltvedt Trine Solberg Møyner Olav
Year 2019
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1689897

Higher-order methods have only been applied to a limited extent in simulation of real petroleum assets. Possible reasons are complex grid formats (unstructured, polyhedral cells, large aspect ratios) and need for implicit time discretization. I this talk, we outline how weighted essentially non-osci...

Authors Klemetsdal Øystein Lie Knut-Andreas Møyner Olav Mykkeltvedt Trine Solberg
Year 2019
Type Conference lecture and academic presentation
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1689896

Many multiscale methods for solving elliptic/parabolic flow equations can be written in operator form using a restriction and a prolongation operator defined over a coarse partition of an underlying fine grid. The restriction operator constructs a reduced system of flow equations on the coarse parti...

Authors Lie Knut-Andreas Møyner Olav Klemetsdal Øystein
Year 2019
Type Conference lecture and academic presentation
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1689894

We present a novel framework for generating reduced-order models that combines agglomeration of cells from existing high-fidelity reservoir models and flow-based upscaling. The framework employs a hierarchical grid-coarsening strategy that enables accurate preservation of geological structures from ...

Authors Guion Alexandre Nicolas Skaflestad Bård Lie Knut-Andreas Wu Xiao-Hui
Year 2019
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1689890

High-resolution discretizations can be advantageous in compositional simulation to reduce excessive numerical diffusion that tends to mask shocks and fingering effects. In this work, we outline a fully implicit, dynamic, multilevel, high-resolution simulator for compositional problems on unstructure...

Authors Klemetsdal Øystein Møyner Olav Lie Knut-Andreas
Year 2019
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1680731

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, many of the essential nonlinearities are associated with the transport equation,...

Authors Klemetsdal Øystein Møyner Olav Lie Knut-Andreas
Year 2019
Type Journal publication