Browsing NORCE vitenarkiv by Author "Helland, Johan Olav"
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Constrained optimization of offshore wind turbine positions under uncertain wind conditions with correlated data
Pettersson, Per; Aursjø, Olav; Helland, Johan Olav; Jettestuen, Espen (Peer reviewed; Journal article, 2023)Offshore wind power production is subject to substantial uncertainty due to variability in wind conditions. Planning of new wind parks should take these uncertainties into account by means of stochastic modeling and ... -
A Discrete-Domain Approach to Three-Phase Hysteresis in Porous Media
Helland, Johan Olav; Jettestuen, Espen; Friis, Helmer Andre` (Peer reviewed; Journal article, 2021)We present a discrete-domain approach to three-phase displacements and hysteresis in porous media. In this method, constrained energy minimization leads to evolution equations for local saturations that describe a wide ... -
A locally conservative multiphase level set method for capillary-controlled displacements in porous media
Jettestuen, Espen; Friis, Helmer Andre`; Helland, Johan Olav (Peer reviewed; Journal article, 2021)We present a multiphase level set method with local volume conservation for capillary-controlled displacement in porous structures. Standard numerical formulations of the level set method for capillary-controlled (or, ... -
Pore-scale modelling of three-phase capillary pressure curves directly in uniformly wet rock images
Zhou, Yingfang; Hatzignatiou, Dimitrios Georgios; Helland, Johan Olav; Yulong, Zhao; Cai, Jianchao (Journal article; Peer reviewed, 2021)In this work, we developed a semianalytical model to compute three-phase capillary pressure curves and associated fluid configurations for gas invasion in uniformly wet rock images. The fluid configurations and favorable ...