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Scattering amplitudes of massive Nambu-Goldstone bosons
(Journal article; Peer reviewed, 2018)
Massive Nambu-Goldstone (mNG) bosons are quasiparticles the gap of which is determined exactly by symmetry. They appear whenever a symmetry is broken spontaneously in the ground state of a quantum many-body system and at ...
Isogeometric methods for CFD and FSI-simulation of flow around turbine blades
(Journal article; Peer reviewed, 2015)
Coupled fluid-structure interaction simulations of wind turbines have traditionally been considered computationally too expensive to carry out. However, more powerful computers and better solution techniques based on ...
Effect of turbulence intensity on the performance of an offshore vertical axis wind turbine
(Journal article; Peer reviewed, 2015)
Offshore wind energy is one of the most competitive renewable energy resources available to us, which until now been under- exploited. Most of the problems associated with wind farm installation like land acquisition, low ...
Divergence-conforming discretization for Stokes problem on locally refined meshes using LR B-splines
(Journal article; Peer reviewed, 2015)
To solve the incompressible flow problems using isogeometric analysis, the div-compatible spline spaces were originally introduced by Buffa et al. (2011), and later developed by Evans (2011). In this paper, we extend the ...
Simple a posteriori error estimators in adaptive isogeometric analysis
(Journal article; Peer reviewed, 2015)
n this article we propose two simple a posteriori error estimators for solving second order elliptic problems using adaptive isogeometric analysis. The idea is based on a Serendipity1pairing of discrete approximation spaces ...
On the similarities and differences between Classical Hierarchical, Truncated Hierarchical and LR B-splines
(Journal article; Peer reviewed, 2015)
Smooth spline functions such as B-splines and NURBS are already an established technology in the field of computer-aided design (CAD) and have in recent years been given a lot of attention from the computer-aided engineering ...
LES and RANS simulation of onshore Bessaker wind farm: analyzing terrain and wake effects on wind farm performance
(Journal article; Peer reviewed, 2015)
This work compares the predictive performance of RANS and LES solver in capturing the effect of terrain and wakes on the performance of the Bessaker wind farm. This 25 turbine wind farm is located in a highly complex terrain ...
A Reactive Collision Avoidance Algorithm for Nonholonomic Vehicles
(Journal article; Peer reviewed, 2017)
This paper presents a reactive collision avoidance algorithm for vehicles with unicycle-type nonholonomic constraints. Static and dynamic obstacles are avoided by keeping a constant avoidance angle to the obstacle. The ...
Reversed Hysteresis during CO Oxidation over Pd75Ag25(100)
(Journal article; Peer reviewed, 2016)
CO oxidation over Pd(100) and Pd75Ag25(100) has been investigated by a combination of near-ambient-pressure X-ray photoelectron spectroscopy, quadrupole mass spectrometry, density functional theory calculations, and ...
Optimizing the Wood Value Chain in Northern Norway Taking Into Account National and Regional Economic Trade-Offs
(Journal article; Peer reviewed, 2017)
As a consequence of past decades of extensive afforestation in Norway, mature forest volumes are increasing. National forestry politics call for sustainable and efficient resource usage and for increased regional processing. ...