Sökning: "coherent turbulent structures"

Hittade 5 uppsatser innehållade orden coherent turbulent structures.

  1. 1. Evaluation of a stochastic model of coherent turbulent structures for atmospheric particle deposition applications

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Andreas Eriksson; [2022]
    Nyckelord :atmospheric dispersion; particle deposition; k-epsilon; RANS; lagrangian particle model; stochastic particle model; OpenFOAM; SIMPLE algorithm; ABL; atmospheric boundary layer; neutral boundary layer; coherent turbulent structures;

    Sammanfattning : In this thesis, we have evaluated a stochastic Lagrangian model for computing particle deposition rates with prospects to use for atmospheric deposition applications.  The model is one-dimensional and models the particle dynamics in the boundary layers near walls and obstacles by simulating the coherent turbulent structures and Brownian motion governing the wall-normal transport. LÄS MER

  3. 2. Predicting the Temporal Dynamics of Turbulent Channels through Deep Learning

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Borrelli Giuseppe; [2021]
    Nyckelord :Turbulent Flows; Deep Learning; Minimal Channel Flow; Fourier POD FFT-POD ; Data-driven analysis; Long-short-term-memory LSTM networks.;

    Sammanfattning : The interest towrds machine learning applied to turbulence has experienced a fast-paced growth in the last years. Thanks to deep-learning algorithms, flow-control stratigies have been designed, as well as tools to model and reproduce the most relevant turbulent features. LÄS MER

  4. 3. Predicting Coherent Turbulent Structures with Artificial Neural Networks

    Master-uppsats, KTH/Matematik (Avd.)

    Författare :Daniel Schmekel; [2021]
    Nyckelord :Turbulent; Coherent turbulent structures; Machine learning; CNN; LSTM; Turbulens; Coherent turbulent structures; maskininlärning; CNN; LSTM;

    Sammanfattning : Turbulent flow is widespread in many applications, such as airplanes or cars. Such flow is characterized by being highly chaotic and impossible to predict far into the future. In turbulent flow, there exist regions that have different properties compared to neighboring flow; these regions are called coherent turbulent structures. LÄS MER

  5. 4. On the swirl-switching in developing bent pipe flow with direct numerical simulation

    Master-uppsats, KTH/Numerisk analys, NA

    Författare :Lorenz Hufnagel; [2016]
    Nyckelord :;

    Sammanfattning : This work deals with the computational setup, simulation and analysis of turbulent flow through developing bent pipes. Specifically the effect of swirl-switching for the Dean vortices is analysed. A synthetic turbulent inflow condition is implemented and validated. LÄS MER

  7. 5. Simulation and modal analysis of instability and transition in a steady eccentric stenotic flow.

    Master-uppsats, KTH/Mekanik

    Författare :Zeinab Moradi Nour; [2013]
    Nyckelord :;

    Sammanfattning : Direct numerical simulation (DNS) of steady flow, with Re = 750 at inlet, through stenosed pipe has been done to study transition and turbulence of the flow in the post-stenosis area. The pipe has 75% constriction by area reduction and 5% eccentricity of the main pipe diameter at the throat. LÄS MER