Sökning: "Turbulence intensity"

Visar resultat 16 - 20 av 43 uppsatser innehållade orden Turbulence intensity.

  1. 16. Using airborne laser scans to model roughness length and forecast energy production of wind farms.

    Magister-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Joris Valee; [2019]
    Nyckelord :Forest Management; Airborne Laser Scan; Roughness Length; Displacement Height; Wind Power; Annual Energy Production; MATLAB; WindPRO;

    Sammanfattning : Successful wind power projects start with a realistic representation of the surface, more specifically the surface roughness of the site. This thesis investigates the use of airborne laser scans to model the surface roughness around a new wind farm. LÄS MER

  3. 17. Effect of upstream turbulence on truck aerodynamics

    Master-uppsats, Linköpings universitet/Mekanisk värmeteori och strömningslära

    Författare :Zhivko Nikolov; [2017]
    Nyckelord :SCANIA; upstream turbulence; truck aerodynamics; Jakob Mann s method;

    Sammanfattning : The aerodynamic team at SCANIA has discovered the need to investigate the effect of the upstream turbulence conditions on the aerodynamics of the trucks. This need comes from the fact that there are differences between the drag coefficients obtained using computational fluid dynamics (CFD) and the on-road measurements. LÄS MER

  4. 18. Improvement of RANS Forest Model via Closure Coefficient Modification

    Magister-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Geoffrey DeSena; [2017]
    Nyckelord :wind; turbulence; forest; model; RANS; Lopes; closure; WindSim;

    Sammanfattning : As wind farms continue to take up more land throughout Northern Europe, developers are looking to sparsely populated areas, particularly in northern Fennoscandia, which hosts strong winds but also mixed and patchy forests over complex terrain. The complexity makes wind resource assessments difficult, raising uncertainty and therefore cost. LÄS MER

  5. 19. CFD Modeling and Optimization of Primary sedimentation tank

    Master-uppsats, KTH/Vattendragsteknik

    Författare :Aibin Zhang; [2017]
    Nyckelord :VOF model; RNG k-ε model; velocity; turbulence; primary sedimentation tank;

    Sammanfattning : In this project, the flow field characteristics of the simplified 2D rectangular primary sedimentation tank in Syvab wastewater treatment plant were achieved by a transient water-air two phases finite-volume method, applying Volume-Of-Fluid (VOF) model. RNG k-ε turbulence model was also employed to calculate the turbulent kinetic energy and its dissipation rate. LÄS MER

  7. 20. Defining the Wake Decay Constant as a Function of Turbulence Intensity to Model Wake Losses in Onshore Wind Farms

    Magister-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Jochanan Kollwitz; [2016]
    Nyckelord :N.O. Jensen model; wake losses; onshore; wind farms; forested terrain; wake decay constant; turbulence intensity; windPRO;

    Sammanfattning : Modelling the wake effect generated by wind turbines is an essential part for calcu- lating a wind farm’s expected energy production. Operating wind turbines disturb the flow of the wind, which results in decreased production of downwind turbines. The N. O. LÄS MER