Sökning: "Turbulent Gränsskikt"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden Turbulent Gränsskikt.

  1. 1. Deep learning for non-intrusive sensing in turbulence with passive scalars

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Arivazhagan Geetha Balasubramanian; [2021]
    Nyckelord :Turbulent boundary layer; passive scalar; direct numerical simulation; Prandtl number; Machine learning; convolutional neural network; Turbulent gränsskikt; passiv skalär; direkt numerisk simulering; Prandtl-nummer; maskininlärning; faltningsneurala nätverk;

    Sammanfattning : The near-wall modelling of turbulent flows has been an active field of research due to the computational cost associated with the direct numerical simulations of such flow, which are characterized by a wide range of length and time scales. With the recent advancements in technological capabilities, the availability of high-fidelity data has enabled the construction of data-driven approaches to model turbulence. LÄS MER

  3. 2. Development and validation of an improved wall-function boundary condition for computational aerodynamics

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Carlo Loris Palombo; [2021]
    Nyckelord :Wall Functions; Wall Treatment; M-Edge; Computational Fluid Dynamics; Turbulent Boundary Layer; Turbulence Models; Väggfunktionsranvillkor; M-Edge; Strömningsmekaniska beräkningar; Turbulent Gränsskikt; Turbulensmodeller;

    Sammanfattning : Computational Fluid Dynamics is a powerful and widely used tool for developing projectsthat concern flow motion, in very different fields. Industrial CFD solvers are continuouslydeveloped with the aim of improving accuracy and reducing the computational cost of thesimulations. LÄS MER

  4. 3. Two-dimensional roughness and Tollmien-Schlichting waves: a study on transition

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Derek Micheletto; [2020]
    Nyckelord :;

    Sammanfattning : Two-dimensional (2D) roughnesses induce premature transition to turbulence in laminar boundary layers by amplifying the disturbances in the flow and promoting the development of non-linearities. The present thesis aims at furthering our understanding of this phenomenon's underlying mechanisms and elucidating the effects of the different geometrical parameters of the roughness' cross section. LÄS MER

  5. 4. Controlling the Laminar-to-Turbulent Transition in a Fluid Flow

    Kandidat-uppsats, KTH/Mekanik

    Författare :Sundin Johan; [2015]
    Nyckelord :;

    Sammanfattning : Det finns många vardagliga anordningar där en fluid interagerar med en yta. Reduktion av ytfriktion mellan fluiden och ytan kan förbättra verkningsgraden för många av dessa anordningar. Ett typiskt exempel på denna interaktion är flödet över en platt yta. LÄS MER

  7. 5. Spatially varying parameters in observed new particle formation events

    Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Författare :Jimmie Carpman; [2015]
    Nyckelord :Aerosol; aerosols; particle; modeling; new particle formation; NPF; climate; coagulation; dry deposition; CCN; banana; distribution; number size distribution; spatial variation; spatial; Earth and Environmental Sciences;

    Sammanfattning : Aerosol particles affect the global climate due to its influence on the scattering and absorption of short-wave and long-wave radiation. The extent of the influence of aerosol particles on the climate varies a lot by time and space, and needs to be quantified. LÄS MER