Browsing UiS Brage by Author "Giljarhus, Knut Erik Teigen"

Aerodynamic influence of an alpine skier’s arms

Giljarhus, Knut Erik Teigen; Reid, Robert Cortas; Liland, Fredrik Fang; Oggiano, Luca; Elfmark, Ola (Peer reviewed; Journal article, 2022)

Understanding how postural changes in alpine skiing affect the overall aerodynamic drag is highly important for enhancing performance. Although the arm configuration of the athlete can have a significant impact on the ...

Aerodynamic Investigation of Tucked Positions in Alpine Skiing

Elfmark, Ola; Giljarhus, Knut Erik Teigen; Liland, Fredrik Fang; Oggiano, Luca; Reid, Robert (Peer reviewed; Journal article, 2021)

The purpose of this investigation was to examine the aerodynamics of tucked positions in competitive alpine skiing. To further our understanding of how a skier’s position affects the air flow and the resulting aerodynamic ...

Bruk av nettbrett til digitale innleveringer i fag med matematisk notasjon

Giljarhus, Knut Erik Teigen; Mikkelsen, Ove Kjetil (Peer reviewed; Journal article, 2021)

MNT-fag har utstrakt bruk av matematisk notasjon og diagrammer. For øvingsoppgaver og eksamen i disse fagene blir det fortsatt overveiende brukt penn og papir. Samtidig er det et økende fokus på digitalisering. Digitale ...

CFD Simulation of Helicopter Downwash

Baricako, Olli Kerstan (Master thesis, 2024)

Several 3D CFD simulations of helicopter downwash are conducted in this master’s thesis. It aims to analyse the induced downwash pattern from a Search and Rescue (SAR) QUEEN helicopter, with and without the fuselage, on ...

Classification Analytics for Wind Turbine Blade Faults: Integrated Signal Analysis and Machine Learning Approach

Ali, Waqar; El-Thalji, Idriss; Giljarhus, Knut Erik Teigen; Delimitis, Andreas (Peer reviewed; Journal article, 2024)

Wind turbine blades are critical components of wind energy systems, and their structural health is essential for reliable operation and maintenance. Several studies have used time-domain and frequency-domain features ...

Comparative Analysis of 3D Human modeling generation using 3D Structured Light Scanning and Machine Learning generation

Khan, Md Jubaer Islam (Master thesis, 2023)

Integration of 3D model production from a single 2D RGB picture using machine learning into mainstream human 3D modelling requires significant evaluation data with an appropriate reference value relative to structured light ...

Comparison of unidirectional and bidirectional airfoils in a tidal stream turbine

Giljarhus, Knut Erik Teigen; Owolabi, Jibola Obafemi; Frøynes, Olav Are (Peer reviewed; Journal article, 2022)

Tidal stream turbines offer an attractive method for stable renewable energy generation. Due to the periodicity of the tidal stream, a tidal stream turbine can be designed to operate in a bidirectional manner, thereby ...

Computational fluid dynamics simulation of buoyant mixing of miscible fluids in a tilted tube

Ghorbani, Maryam; Giljarhus, Knut Erik Teigen; Skadsem, Hans Joakim; Time, Rune Wiggo (Peer reviewed; Journal article, 2021)

Buoyancy-driven flows and mixing of fluids with different densities occur frequently both in nature and as part of industrial processes within chemical and petroleum engineering. This work investigates the buoyant exchange ...

Computational investigation of the aerodynamic performance of reversible airfoils for a bidirectional tidal turbine

Giljarhus, Knut Erik Teigen; Panahi, Ghazalsadat Shariat; Frøynes, Olav Are (Peer reviewed; Journal article, 2021)

A reversible airfoil is an airfoil that has equal performance when the flow is reversed. Such airfoils are relevant for many different applications, including use in ventilation fans, helicopter rotors, wind turbines and ...

Cyclist Posture Optimisation using CFD

Stave, Daniel Årrestad (Masteroppgave/UIS-TN-IMBM/2018, Master thesis, 2018-06)

A procedure for optimising the posture of a cyclist concerning the drag force predicted by computational fluid dynamics is developed and executed using open-source software only. The computational setup is validated by ...

Design Optimisation of Power Cable Configurations for Floating Offshore Wind Turbines

Schnepf, Anja (PhD Theses UiS;, Doctoral thesis, 2024)

The present work investigates the design of dynamic inter-array power cable configurations for floating offshore wind turbines (FOWTs). It builds upon traditional design processes by integrating optimisation methods. Extensive ...

Disc golf trajectory modelling combining computational fluid dynamics and rigid body dynamics

Giljarhus, Knut Erik Teigen; Gooding, Mika Tobias; Njærheim, Joar (Peer reviewed; Journal article, 2022)

In the sport of disc golf, athletes utilize discs with various shapes to achieve their desired throws. Computational methods have the potential to give further insight into how the disc shape and throw parameters influence ...

Effect of different source terms and inflow direction in atmospheric boundary modeling over the complex terrain site of Perdigão

Venkatraman, Kartik; Hågbo, Trond-Ola; Buckingham, Sophia; Giljarhus, Knut Erik Teigen (Peer reviewed; Journal article, 2023)

Assessing wind conditions in complex terrain requires computational fluid dynamics (CFD) simulations incorporating an accurate parameterization of forest canopy effects and Coriolis effects. This study investigates how ...

Entrance Lengths for Fully Developed Laminar Flow in Eccentric Annulus

Resell, Åsmund Aamodt; Giljarhus, Knut Erik Teigen; Skadsem, Hans Joakim (Peer reviewed; Journal article, 2024)

We study the entrance length in eccentric annular geometries, where the axes of the inner and outer pipes forming the annulus are offset from each other. Such geometries are considered relevant for several industrial ...

Experimental testing of the new wind tunnel at the University of Stavanger

Alsnes, Mats; Haga, Sindre (Bachelor thesis, 2023)

This thesis aims to gain experience in using the newly installed CTO S.A open circuit wind tunnel at the University of Stavanger. Extensive research has been done on the topics of wind tunnel use, general aerodynamics, ...

Experimental testing of the new wind tunnel at the University of Stavanger

Alsnes, Mats; Haga, Sindre Slettemoen (Bachelor thesis, 2023)

This thesis aims to gain experience in using the newly installed CTO S.A open circuit wind tunnel at the University of Stavanger. Extensive research has been done on the topics of wind tunnel use, general aerodynamics, ...

Flow over a step cylinder using partially-averaged Navier-Stokes equations with application towards dynamic subsea power cables

Shaukat, Usman; Schnepf, Anja; Giljarhus, Knut Erik Teigen (Peer reviewed; Journal article, 2023)

Understanding the flow characteristics of buoyancy sections in power cable and umbilical configurations is crucial for analyzing floating offshore wind turbine systems. Buoyancy sections decouple the motions from the floater ...