Blar i UiS Brage på forfatter "Giljarhus, Knut Erik Teigen"

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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 ...

    • 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 ...

    • 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 ...

    • 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 Simulation to Study SMART KITE Design 

      Nguyen, Cuong Chi (Master thesis, 2021)
      The Potsdam Propeller Test Case PPTC propeller was used as the turbine for the flow simulation of the tethered undersea kite TUSK energy system in this project. OpenFOAM ‘propeller’ and ‘wingmotion’ tutorials used as ...

    • Fully resolved CFD simulation of a tidal stream turbine in bidirectional duct 

      Owolabi, Jibola (Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020)
      Renewable energy, in it’s present contribution, is inadequate to meet up with the global energy demand. Though the Tidal current energy is known for its inherent great potential, its impact in the world’s total renewable ...

    • Improvement of efficiency of a coaxial octodrone 

      Gysland, Sondre Andersen; Randeberg, Kjell Vistnes (Bachelor thesis, 2021)
      The goal of this thesis is to find the optimal coaxial configuration for Nordic Unmanned´s drone Staaker BG200. Research has shown that the parameters propeller spacing and diameter, are factors that have the greatest ...

    • Improvement of efficiency of a coaxial octodrone 

      Gysland, Sondre Andersen; Randeberg, Kjell Vistnes (Bachelor thesis, 2021)
      The goal of this thesis is to find the optimal coaxial configuration for Nordic Unmanned ́s drone Staaker BG200. Research has shown that the parameters propeller spacing and diameter, are factors that have the greatest ...

    • Influence of fluid viscosity hierarchy on the reverse-circulation displacement efficiency 

      Ghorbani, Maryam; Giljarhus, Knut Erik Teigen; Skadsem, Hans Joakim (Peer reviewed; Journal article, 2023)
      Reverse-circulation cementing is an alternative strategy for well cementing where the cementing fluids are injected directly into the annulus from the surface. This cementing strategy can reduce downhole circulation pressures ...

    • 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 smoothing in the actuator line model for single and multi-rotor wind turbines 

      Shaukat, Usman (Master thesis, 2022)
      The state-of-the-art actuator line modeling (ALM) method has been used extensively in the past decade to perform large-eddy simulations (LES) of wind turbines as fully resolved blade simulations require complex rotating ...