Sökning: "Stefan Ivanell"

Visar resultat 1 - 5 av 16 avhandlingar innehållade orden Stefan Ivanell.

  1. 1. Numerical computations of wind turbine wakes

    Författare :Stefan S. A. Ivanell; Dan Henningsson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Applied mechanics; Wind Energy; Wind Turbine; Wake; Circulation; Vortex; CFD; EllipSys3D; Actuator line; Teknisk mekanik; Engineering mechanics; Teknisk mekanik;

    Sammanfattning : Numerical simulations using CFD methods are performed for wind turbine applications. The aim of the project is to get a better understanding of the wake behaviour, which is needed since today’s industrial design codes for wind power applications are based on the BEM (Blade Element Momentum) method. LÄS MER

  3. 2. Numerical computations of wind turbine wakes

    Författare :Stefan S. A. Ivanell; Dan Henningson; Peinke Joachim; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Actuator Line Model; Actuator Disc Model; Wind Turbine Wake; CFD; LES; EllipSys3D; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : Numerical simulations of the Navier-Stokes equations are performed to achieve a better understanding of the behaviour of wakes generated by wind turbines. The simulations are performed by combining the in-house developed computer code EllipSys3D with the actuator line and disc methodologies. LÄS MER

  4. 3. Mean wind and turbulence conditions over forests

    Författare :Johan Arnqvist; Hans Bergström; Stefan Ivanell; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wind profile; Turbulence; Boundary layer; Meteorologi; Meteorology;

    Sammanfattning : .... LÄS MER

  5. 4. Efficient Large-­eddy Simulation for Wind Energy Applications

    Författare :Henrik Asmuth; Stefan Ivanell; Hugo Olivares-Espinosa; Karl Nilsson; Richard Stevens; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Modelling the interaction of wind turbines with the ambient flow is essential for almost all technical aspects of wind energy exploitation. Large-eddy simulation (LES) is the most detailed approach feasible to model this complex interaction of wind turbines with the atmospheric boundary layer and the wakes of upstream turbines. LÄS MER

  7. 5. Energy planning for islands : Guiding island energy transition and decision-making

    Författare :Andrew Barney; Heracles Polatidis; Stefan Ivanell; Magdalena Kuchler; Theocharis Tsoutsos; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Islands; Energy planning; Renewable Energy; Energy transition; Decarbonisation;

    Sammanfattning : The importance and benefits of transitioning away from fossil fuel based energy systems is becoming ever clearer. The transition is especially crucial for geographic islands that typically have limited, or no, access to mainland energy networks. LÄS MER