Sökning: "transition prediction"

Visar resultat 1 - 5 av 78 avhandlingar innehållade orden transition prediction.

  1. 1. Stability analysis and transition prediction of wall-bounded flows

    Författare :Ori Levin; KTH; []
    Nyckelord :Boundary layer; wall jet; algebraic growth; exponential growth; lift-up effect; streamwise streaks; Tollmien-Schlichting waves; free-stream turbulence; roughness element; transition prediction; Parabolized Stability Equations; Direct Numerical S;

    Sammanfattning : Disturbances introduced in wall-bounded .ows can grow andlead to transition from laminar to turbulent .ow. In order toreduce losses or enhance mixing in energy systems, afundamental understanding of the . LÄS MER

  2. 2. Psychology of Sport Injury : Prediction, Prevention and Rehabilitation in Swedish Team Sport Athletes

    Författare :Andreas Ivarsson; Urban Johnson; Judy van Raalte; Linnéuniversitetet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; Athletic injury; prediction; prevention; psychology; rehabilitation;

    Sammanfattning : The dissertation consists of five separate studies that all have focused on different aspects of the relationship between psychological factors and sport injuries.In the first study the aim was to investigate female elite soccer players’ experiences of the time prior to the occurrence of an ACL injury. LÄS MER

  3. 3. Numerical studies of transtion in wall-bounded flows

    Författare :Ori Levin; Dan Henningson; Nikolaus Adams; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; boundary layer; suction; wall jet; streaks; waves; periodic disturbance; localized disturbance; turbulent spot; algebraic growth; exponential growth; stability; transition thresholds; transition prediction; PSE; DNS; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : Disturbances introduced in wall-bounded flows can grow and lead to transition from laminar to turbulent flow. In order to reduce losses or enhance mixing in energy systems, a fundamental understanding of the flow stability and transition mechanism is important. LÄS MER

  4. 4. Prediction of Wing Section Lift and Drag from Numerical Solutions of the Navier-Stokes Equations

    Författare :Björn Regnström; Chalmers University of Technology; []
    Nyckelord :airfoil; incompresible flow; computational fluid dynamics; transition; numerical analysis; boundary layer stability;

    Sammanfattning : A Navier-Stokes finite difference method is developed and applied to two-dimensional, incompressible, viscous flow around wing sections at medium to high Reynolds numbers. An important feature of such flows is laminar boundary layers with spatially amplified Tollmien-Schlichting waves initiating transition to turbulence. LÄS MER

  5. 5. Numerical Simulation of Turbulent Flows for Turbine Blade Heat Transfer Applications

    Författare :Jonas Larsson; Chalmers University of Technology; []
    Nyckelord :k-.omega.; k-.epsilon.; explicit Runge-Kutta; finite volume; turbine; numerical method; non-linear; Navier-Stokes; supersonic; two-equation; external heat transfer; stagnation flow; two-dimensional; transition; low-Reynolds; turbulence model; impulse blade;

    Sammanfattning : Turbine blade heat transfer is an important engineering problem characterized by complex flow fields and high turbulence levels. This thesis is focused on using a full Navier-Stokes solver with two-equation eddy-viscosity models to predict external heat-transfer in single-stage, linear, two-dimensional uncooled turbine cascades. LÄS MER