Sökning: "Large Eddy Simulation"

Visar resultat 11 - 15 av 41 uppsatser innehållade orden Large Eddy Simulation.

  1. 11. CFD Simulations of Flow Characteristics of a Piano Key Weir Spillway

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

    Författare :William Sjösten; Victor Vadling; [2020]
    Nyckelord :Piano Key Weir; Ansys Fluent; Multiphase Flow; Spillway; Flow Characteristics; CFD; Realizable k-epsilon; Volume of Fluid; Renolds-averaged Navier-Stokes;

    Sammanfattning : Comprehensive rehabilitation projects of dam spillways are made in Sweden, due to stricter dam safety guidelines for their discharge capacity. The Piano Key Weir (PKW) is an innovative design which has proven effective through several renovation projects made in many countries including France. LÄS MER

  3. 12. Numerical study with computational fluid dynamics of hybrid rocket engine.

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Martin Lundmark; [2020]
    Nyckelord :LES; Hybrid Rocket; openFOAM;

    Sammanfattning : In this thesis a Large Eddy Simulation (LES) of a hybrid rocket engine burning ethylene (C2H4) in nitrous oxide (N2O) is explored. This is done primarily using a solver and solution scheme provided by the Swedish Defence Research Agency (FOI) and an (at this date) unpublished chemistry model. LÄS MER

  4. 13. Using CFD to investigate casue of vibrations in feed-water system

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Maryam Dabbaghitehrani; [2019]
    Nyckelord :;

    Sammanfattning : Computational fluid dynamics from large scale thermo-hydraulic simulation in 1D to large eddy simulation in 3D, were applied in this master thesis to study cause of vibrations in a feed-water system downstream the connected pumps. In the first step, the fluid flow of the pumps in RELAP5 simulations was disturbed by the blade passing sinusoidal vibrations to study their propagation in the piping system over time. LÄS MER

  5. 14. Wind Forecasts Using Large Eddy Simulations for Stratospheric Balloon Applications

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Ludvig Sjöberg; [2019]
    Nyckelord :Weather Research and Forecasting Model; Large Eddy Simulation; Microscale Meteorology;

    Sammanfattning : The launch of large stratospheric balloons is highly dependant on the meteorological conditions at ground level, including wind speed. The balloon launch base Esrange Space Center in northern Sweden currently uses forecasts delivered through the Swedish Meteorological and Hydrological Institute to predict opportunities for balloon launches. LÄS MER

  7. 15. Interscale transport of Reynolds stresses in wall-bounded flows

    Master-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Gioele Ferrante; Andres Morfin; [2019]
    Nyckelord :Reynolds Stress; Zero-Pressure Gradient Turbulent Boundary Layer; Turbulent Couette Flow; Inverse Interscale Transport; Energy Cascase; Wall-bounded Flows; Direct Numerical Simulation; Large Eddy Simulation.;

    Sammanfattning : Couette, pipe, channel, and zero-pressure gradient (ZPG) turbulent boundary layer (TBL) flows have classically been considered as canonical wall-bounded turbulent flows since their near-wall behavior is generally considered to be universal, i.e. invariant of the flow case and the Reynolds number. LÄS MER