Browsing Vitenskapelige publikasjoner (TN-IMBM) by Author "Giljarhus, Knut Erik Teigen"
Now showing items 1-16 of 16
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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 ... -
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 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 ... -
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 ... -
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 ... -
Investigation of Influence of Adjustments in Cyclist Arm Position on Aerodynamic Drag Using Computational Fluid Dynamics
Giljarhus, Knut Erik Teigen; Stave, Daniel Årrestad; Oggiano, Luca (Peer reviewed; Journal article, 2020-06)In professional cycling, even small adjustments in position could mean that valuable seconds are gained over the course of a time-trial race. This study investigates the influence of arm position on the aerodynamic drag ... -
Investigation of Rotor Efficiency with Varying Rotor Pitch Angle for a Coaxial Drone
Giljarhus, Knut Erik Teigen; Apeland, Jørgen; Porcarelli, Alessandro (Peer reviewed; Journal article, 2022-04)Coaxial rotor systems are appealing for multirotor drones, as they increase thrust without increasing the vehicle’s footprint. However, the thrust of a coaxial rotor system is reduced compared to having the rotors in line. ... -
Investigation of transitional turbulence models for CFD simulation of the drag crisis for flow over a sphere
Nakhostin, Seyedeh Mona; Giljarhus, Knut Erik Teigen (Peer reviewed; Journal article, 2019)The drag crisis is an interesting physical phenomenon for flow over bluff bodies, where the drag coefficient suddenly drops as the Reynolds number increases. This behavior is caused by the flow transitioning from laminar ... -
Modelling of hydrocarbon gas and liquid leaks from pressurized process systems
Bahuguni, Anand; Kumara, Amaranath S.; Giljarhus, Knut Erik Teigen (Peer reviewed; Journal article, 2019)The hydrocarbon leaks from process systems potentially lead to hazardous consequences with regard to human safety, environmental pollution and valuable assets. The hydrocarbon leaks may be gas leaks, liquid leaks or ... -
Pedestrian Wind Comfort Assessment Using Computational Fluid Dynamics Simulations With Varying Number of Wind Directions
Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen (Peer reviewed; Journal article, 2022-07)The construction of a building inevitably changes the microclimate in its vicinity. Many city authorities request comprehensive wind studies before granting a building permit, which can be obtained through Computational ... -
The performance of structured and unstructured grids on wind simulations around a high-rise building
Hågbo, Trond-Ola; Giljarhus, Knut Erik Teigen; Qu, Sen; Hjertager, Bjørn H (Journal article; Peer reviewed, 2019)In this study, computational fluid dynamics has been applied to analyze the performance of both structured and unstructured meshes when used in steady-state simulations of wind in an urban area. This case specifically ... -
Validation and assessment of different RANS turbulence models for simulating turbulent flow through an orifice plate
Jurga, Agata Patrycja; Janocha, Marek Jan; Yin, Guang; Giljarhus, Knut Erik Teigen; Ong, Muk Chen (Peer reviewed; Journal article, 2021)In the present study, numerical simulations using different Reynolds-Averaged Navier–Stokes (RANS) turbulence models are carried out to investigate the turbulent flow through the orifice plate at Reynolds number (Re) of ... -
Virtual skeleton methodology for athlete posture modification in CFD simulations
Giljarhus, Knut Erik Teigen; Liland, Fredrik Fang; Oggiano, Luca (Peer reviewed; Journal article, 2023)This study focuses on the aerodynamic influence of athlete posture in sports aerodynamics. To analyze a specific posture, wind tunnel measurements and computer simulations are commonly employed. For computer simulations, ...