Search for dissertations about: "vortex dynamics"

Showing result 11 - 15 of 98 swedish dissertations containing the words vortex dynamics.

  2. 11. Experimental Studies of the Vortex Solid-to-Liquid Transition and Disorder in High-Temperature Superconductors

    Author : Björn Lundqvist; KTH; []
    Keywords : high-temperature superconductors; vortex dynamics; vortex solid-to-liquid transition; B c; B ab; anisotropy; YBCO single crystals; oxygen deficiency; Tl-2212; Tl-2201; charge neutral doping; disorder effects;

    Abstract : .... READ MORE

  4. 12. Computational fluid-dynamics investigations of vortex generators for flow-separation control

    Author : Florian von Stillfried; Arne Johansson; Stefan Wallin; Jonathan Morrison; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; flow-separation control; vane vortex generator; vortex generator jet; zero-pressure-gradient turbulent boundary layer; adverse-pressure-gradient turbulent boundary layer; statistical modelling; turbulence; Reynolds stress- transport model; computational fluid dynamics;

    Abstract : Many flow cases in fluid dynamics face undesirable flow separation due to ad-verse pressure gradients on wall boundaries. This occurs, for example, due togeometrical reasons as in a highly curved turbine-inlet duct or on flow-controlsurfaces such as wing trailing-edge flaps within a certain angle-of-attack range. READ MORE

  5. 13. Adaptive Mesh Refinement and Simulations of Unsteady Delta-Wing Aerodynamics

    Author : Yann Le Moigne; KTH; []
    Keywords : delta wing; high angle of attack; vortex; pitching; mesh refinement; UCAV; vortex sensor; tensor ofvelocity gradients;

    Abstract : This thesis deals with Computational Fluid Dynamics (CFD)simulations of the flow around delta wings at high angles ofattack. These triangular wings, mainly used in militaryaircraft designs, experience the formation of two vortices ontheir lee-side at large angles of attack. READ MORE

  6. 14. On Some Properties and Applications of Patterned Ferromagnetic Thin Films

    Author : Pierre E. Roy; Peter Svedlindh; Per Nordblad; Jeffrey McCord; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; micromagnetics; vortex; spin dynamics; domains; MFM; microwave; patterned; permalloy; Materialvetenskap; Materials science; Teknisk materialvetenskap;

    Abstract : A microwave reflection method has been used to measure the spin excitations corresponding to the translational mode of magnetic vortices in samples containing either one or two vortices. Experimental findings are complemented by micromagnetic simulations. One-vortex systems are investigated in micron-sized circular and elliptical cylinders. READ MORE

  7. 15. Tailored Properties of Ferromagnetic Thin Films

    Author : Peter Warnicke; Peter Svedlindh; Peter Grünberg; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; micromagnetics; domain wall; vortex; pinning potential; nanowire; spin dynamics; spin transfer torque; magnetic anisotropy; MFM; Permalloy; PMA; magnetic multilayer; Curie temperature; DMS; GaMnAs; magnetic bioseparation; Engineering physics; Teknisk fysik;

    Abstract : Magnetic thin films and patterned nanostructures have been studied with respect to their magnetic properties using SQUID-magnetometry, magnetic force microscopy, electrical measurements, and micromagnetic calculations. Properties of vortex domain walls, trapped in Permalloy nanowires with artificial constrictions, were investigated experimentally and by numerical calculations. READ MORE