Sökning: "vortex shedding"

Visar resultat 1 - 5 av 13 uppsatser innehållade orden vortex shedding.

  1. 1. Forced response numerical investigation of a transonic compressor rotor

    Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Mariana Pires Gonçalves Toco Dias; [2023]
    Nyckelord :Compressor; rotor; blisk; aeroelasticity; aerodynamic damping; CFD; transient; forced response;

    Sammanfattning : The present thesis discusses the forced response of a rotor’s bladed-disk when excited by the periodic force produced by a wake generator, or Inlet Guide Vane (IGV),with 8 equally-spaced blades. These components are part of an axial transonic compressor rig, moreover the Transonic Compressor Darmstadt 1 (TCD1), located at the Technical University of Darmstadt. LÄS MER

  3. 2. CFD Analyses for Wind Load AssessmentCFD Analyses for Wind Load Assessment : Wind-induced vibrations in the Bomarsunds Bridge hangers

    Master-uppsats, KTH/Bro- och stålbyggnad

    Författare :Fatiha El Azrak; [2023]
    Nyckelord :;

    Sammanfattning : The trend in recent years of building longer and slender bridge components has introduced new challenges to ensure their stability and strength. This master thesis focuses on the effects of wind-induced vibrations in the context of long, slender arch bridge components, particularly the recently constructed Bomarsunds Bridge in Åland, Finland. LÄS MER

  4. 3. 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. 4. Structural intrusion, flow disturbance and spillway capacity : CFD modeling of the Torpshammar dam

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

    Författare :Adéle Wallin; [2018]
    Nyckelord :RNG k-ε model; VOF; Fluent; turbulence; rectangular beams; flow pattern; discharge capacity; flow velocity;

    Sammanfattning : At the Torpshammar dam two rectangular beams are situated upstream of the spillway gates to stabilize the sidewalls holding the embankment of the dam. A computational fluid dynamics (CFD) simulation of the dam with the bottom outlets open was made to investigate how the flow and discharge capacity is affected by the beams. LÄS MER

  7. 5. Koopman mode analysis of the side-by-side cylinder wake

    Master-uppsats, KTH/Mekanik

    Författare :Jimmy Röjsel; [2017]
    Nyckelord :Bluff body; wake flow; Side-by-side cylinder wake; Flip-op instability; Modal analysis; Koopman operator; Koopman mode decomposition;

    Sammanfattning : In many situations, fluid flows can exhibit a wide range of temporal and spatial phenomena. It has become common to extract physically important features, called modes, as a first step in the analysis of flows with high complexity. LÄS MER