Sökning: "Vorticity"

Visar resultat 16 - 20 av 33 uppsatser innehållade ordet Vorticity.

  1. 16. Extended analysis of a pseudo-spectral approach to the vortex patch problem

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Avdelningen för beräkningsvetenskap

    Författare :Mattias Bertolino; [2018]
    Nyckelord :α-patches problem; discontinuous vorticity equations; 2D Euler equations; Surface Quasi-Geostrophic equations; self-similar solutions; Pseudo-spectral methods; Nonequispaced fast fourier transform.;

    Sammanfattning : A prestudy indicated superior accuracy and convergence properties of apseudo-spectral method compared to a spline-based method implemented byCòrdoba et al. in 2005 when solving the α-patches problem. LÄS MER

  3. 17. Vorticity and Gravitational Wave Perturbations on Cosmological Backgrounds Using the 1+1+2 Covariant Split of Spacetime

    Uppsats för yrkesexamina på avancerad nivå, Umeå universitet/Institutionen för fysik

    Författare :Robin Törnkvist; [2018]
    Nyckelord :;

    Sammanfattning : In this thesis we consider perturbations of a perfect fluid on locally rotationally symmetrical (LRS) class II cosmological backgrounds, with a nonvanishing vorticity of the fluid on the perturbed model. The method used is based on the 1+1+2 covariant decomposition of spacetime, motivated by the assumption of anisotropic expansion, followed by a harmonic decomposition of all gauge invariant quantities. LÄS MER

  4. 18. A parametric study of oil-jet lubrication in gear wheels

    Master-uppsats, Linköpings universitet/Mekanisk värmeteori och strömningslära

    Författare :Dona Biju; [2018]
    Nyckelord :Jet lubrication; velocity ratio; inlet size; heat transfer;

    Sammanfattning : A parametric study of oil-jet lubrication in gear wheels is conducted using Computational Fluid Dynamics (CFD) to study the effect of the different design parameters on the cooling performance in a gearbox. Flow in oil jet lubrication is found to be complex with the formation of oil ligaments and droplets. Various hole radii of 1.5, 2 and 2. LÄS MER

  5. 19. Stream Classification and Solubility of the Dispersion Equation for Piecewise Constant Vorticity

    Kandidat-uppsats, Linköpings universitet/Matematiska institutionen; Linköpings universitet/Tekniska fakulteten

    Författare :Marianne Söderholm; [2018]
    Nyckelord :Water waves; stream solutions; dispersion equation.;

    Sammanfattning : This thesis concerns the water wave problem corresponding to a piecewise constant vorticity function. There are several results connected to this field. LÄS MER

  7. 20. Turbulent Duct Flow with Polymers

    Master-uppsats, KTH/Mekanik

    Författare :Armin Shahmardi; [2018]
    Nyckelord :;

    Sammanfattning : Direct numerical simulation of the turbulent flow in a square duct with polymers has been performed and the results have been compared with the laboratory experiments done at KTH Mechanical engineering department. The polymer suspension is simulated with the FENE-P model, and the numerical results are used to elucidate the mechanism that provides drag reduction and the effect of polymers on the secondary motion which is typical of the turbulent flow in ducts. LÄS MER