Blar i NTNU Open på forfatter "Kristoffersen, Reidar"

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    • Automated Prediction of Fractional Flow Reserve through Numerical Simulation of Coronary Artery Flow 

      Magnus Johannesen (Master thesis, 2019)
      I denne masteroppgaven har det blitt utviklet en metode for å bestemme "Fractional Flow Reserve" indeksen for kvantifisering av funksjonell reduksjon i menneskelige kransarterier. Metoden har benyttet seg av den ...

    • CFD Simulations of Multiphase Flows with Particles 

      Bikmukhametov, Timur (Master thesis, 2016)
      This Master s thesis describes two CFD studies particle plug propagation in bent pipes and critical velocity determination in dilute slurry flows. The objective of this study is to extend an understanding of these phenomena ...

    • Development and Analysis of the FlowManager? Cooldown and Restart Simulator 

      Solvang, Bård (Master thesis, 2008)
      During the work presented in this thesis, the Shut-down flow model of the FlowManager? Cooldown and Restart Simulator has been developed into a transient multiphase flow model that is able to handle shut-down flow and ...

    • Displacement of Non-Newtonian Fluids in Annular Spaces 

      Nguyen, Tri Thanh (Master thesis, 2018)
      A successful cement job is determined by the displacement efficiency. Displacement of drilling fluids in horizontal annuli is a critical element in the completion of wellbores. Optimum displacement requires an understanding ...

    • Favourable design of the air intake of a ramjet 

      Torp, Vegar Hagen (Master thesis, 2016)
      Up until recent years, the guidance systems of missiles have been the limiting factor for the range of air-to-air missiles. However, with recent developments in electronics and computer technology allowing targeting of ...

    • Fluid-Structure Interaction Study of Vortex-Induced Vibration in Thermowells 

      Grøstad, Yngve (Master thesis, 2019)
      Termolommer er typisk utsatt for både statiske og dynamiske belastninger grunnet strømningen rundt den. De dynamiske kreftene som kommer fra virvelavløsningen kan bli problematiske dersom de har samme frekvens som ...

    • LNG Bunkering Operations: Establish probabilistic safety distances for LNG bunkering operations. 

      Arnet, Nora Marie Lundevall (Master thesis, 2014)
      The environmental and economical advantages of using LNG as marine fuel have been recognized by the industry. In response to increasing demand, construction of LNG bunkering infrastructure is under rapid development. Several ...

    • Numerical analysis of non-linear oscillations of micrometre size fluid droplets 

      Frøynes, Olav Are (Master thesis, 2014)
      Nonlinear oscillations of free viscous drops are investigated by solving the full Navier-Stokes equation using the finite element software COMSOL Multiphysics. Oscillations are investigated for droplets released form static ...

    • Numerical Investigation of Natural Convection of Oil Flow in Transformer 

      Ragunathan, Agsagan (Master thesis, 2020)
      Effekttapet, samt gjentatte kaldstart av en elektrisk transformator kan føre til at tem- peraturen i transformatoren blir så høy at levetiden reduseres. For å minke denne tem- peraturøkningen brukes tranformatorolje som ...

    • Numerical simulation of a separating gas-liquid flow regime in a balance piston 

      Ingebrigtsen, Magnus Henneli (Master thesis, 2020)
      Ved hjelp av CFD undersøker denne oppgaven et separerende gas-væske strømningsregime, tidligere oppdaget av OneSubsea. Strømningsregimet ble oppdaget av OneSubsea i en annulær tetning, som en del av en flerfasepumpe, nærmere ...

    • Numerical Simulation of Solidifying Flow - Numerisk simuleringing av størking 

      Rømcke, Olav (Master thesis, 2018)
      This thesis consists of deriving and testing a numerical model for convection dominated solid-liquid phase transitions. Two scientific articles represents the main body of the thesis, but a short documentation of the work ...

    • Numerical study of surface waves on a shear current - Waves behind a surface obstacle 

      Kvamme, Ørjan (Master thesis, 2018)
      This master's thesis has made investigation into waves and currents interaction numerically by the use of an oscillating cylinder as a wave-maker. Three cases were investigated: still water, uniform flow and linear shear ...

    • Numerisk simulering av en Pico-turbin 

      Trefall, Sindre (Master thesis, 2021)
      I denne masteroppgaven dokumenteres prosessen ved et design av en pico-turbin som skal levere nok effekt til å drive kontrollenheten til en urinal ved å bruke ca. 15 % av trykket oppstrøms av turbinen. Oppgaven omfatter ...

    • Numerisk undersøkelse av skrubber 

      Slettedal, Jens Gunnar (Master thesis, 2019)
      Glencore Nikkelverk utvikler en fullskala venturi skrubber for å rense forurenset gass fra et nytt prosessanlegg. Designet skal optimalisere separasjon av partikler i gassfasen og skal baseres på en mindre installert ...

    • On Flywheel Batteries 

      Spakmo, Jo Emil; Langelid, Magnus (Bachelor thesis, 2023)
      Energilagringssystemer forbedrer effektiviteten i elektriske systemer under ubalanser mellom tilbud og etterspørsel, og bidrar til å øke nettverkets stabilitet og kvalitet. De reduserer ujevnheten i fornybar energiproduksjon ...

    • Pragmatic Modeling of Flow in the Human Upper Airways for Sleep Apnea Treatment 

      Weisz, Thor Gudmund (Master thesis, 2022)
      A pragmatic model has been developed to provide rapid flow predictions on a patient-specific basis to gain insight into the state of a patient's airways. These flow predictions are aimed to be further used to predict the ...

    • Programming turbulence models in FORTRAN 

      Herø, Eirik Helno (Master thesis, 2015)
      The two-equation turbulence models Wilcox k-omega and Menter k-omega SST are programmed in FORTRAN and tested on the cases channel flow and backward-facing step. A short time step and a good initial field is required to ...

    • Simulation and Evaluation of Slurry Erosion 

      Strømme, Erik Grimm (Master thesis, 2015)
      Erosion from sand particles is a large problem in piping systems, especially in the oil and gas industries. Different types of erosion occur depending on the concentration of particles present in the fluid. Computational ...

    • Simulation of Starting and Stopping Vortices of an Airfoil 

      Agromayor, Roberto; Rúa Pazos, Jairo; Kristoffersen, Reidar (Journal article; Peer reviewed, 2017)
      When the flow around a streamlined body is accelerated or decelerated,starting and stopping vortices are shed from the trailing edge of the body, respectively. In this work, the transient flow around a NACA4612 airoil ...

    • Simulation of the Environmental Impact on Turbine Blade Monitoring Sensors 

      Nowak, Robert Marcin (Master thesis, 2016)
      Kongsberg Maritime AS is a company mostly involved in selling automation and equipment to ships and oil rigs. They are considered with wind power as well and started program "WiVind" which main goal is to develop a surface ...