Sökning: "eddy viscosity"

Hittade 5 uppsatser innehållade orden eddy viscosity.

  1. 1. Verification and validation of the implementation of an Algebraic Reynolds-Stress Model for stratified boundary layers

    Master-uppsats, KTH/Teknisk mekanik

    Författare :Martina Formichetti; [2022]
    Nyckelord :Atmospheric boundary layer; turbulence modelling; stratified flows; eddy viscosity; eddy diffusivity;

    Sammanfattning : This thesis studies the implementation of an Explicit Algebraic Reynolds-Stress Model(EARSM) for Atmospheric Boundary Layer (ABL) in an open source ComputationalFluid Dynamics (CFD) software, OpenFOAM, following the guidance provided by thewind company ENERCON that aims to make use of this novel model to improvesites’ wind-field predictions. After carefully implementing the model in OpenFOAM,the EARSM implementation is verified and validated by testing it with a stratifiedCouette flow case. LÄS MER

  3. 2. 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

  4. 3. Numerical simulations of mixing for gas exhaust treatment

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Viktor Lahti; [2019]
    Nyckelord :;

    Sammanfattning : According to the World Health Organisation, nine out of ten people live in places with sub par air quality. Therefore, the study of the treatment of polluted air is from a global point of view of great importance, and a matter of life quality for both humans and as well as animals. LÄS MER

  5. 4. Computational Fluid Dynamics Unstructured Mesh Optimization for the Siemens 4th Generation DLE Burner

    Master-uppsats, KTH/Mekanik

    Författare :Dejan Koren; [2015]
    Nyckelord :CFD; Ansys; Fluent; CFX; Mesh optimization; DLE burner; Siemens; Mixing;

    Sammanfattning : Every computational fluid dynamics engineer deals with a never ending story – limitedcomputer resources. In computational fluid dynamics there is practically never enoughcomputer power. LÄS MER

  7. 5. Investigating the influence of farm layout on the energy production of simple wind park configurations

    Master-uppsats, KTH/Kraft- och värmeteknologi

    Författare :Sercan Uysal; [2014]
    Nyckelord :renewable energy; wind energy; wind turbines; wake effect; wake loss; wind farm; wake models; windfarmer; layout optimization;

    Sammanfattning : The interaction between wind turbines in simple wind farm layouts is investigated with the purpose of observing the influence of wake loss phenomenon on the energy production of downwind turbines. Following an intensive exploration stage about wind farm aerodynamics and wake modeling subjects, several tests cases are designed to represent various wind farm configurations, consisting of different number of wind turbines. LÄS MER