Search for dissertations about: "magnetohydrodynamics"

Showing result 1 - 5 of 24 swedish dissertations containing the word magnetohydrodynamics.

  2. 1. Geometric discretization for incompressible magnetohydrodynamics on the sphere

    Author : Michael Roop; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lie-Poisson structure; magnetohydrodynamics; Hamiltonian dynamics; magnetic extension; Casimirs; symplectic Runge-Kutta integrators;

    Abstract : Many physical processes are modelled by partial differential equations (PDE), and their efficient discretization is still a challenging problem and an actively developing field. An important class of models arising in mathematical physics represents PDEs formulated in terms of a Lie-Poisson structure on the dual of infinite-dimensional Lie algebras, such as the Lie algebra of vector fields. READ MORE

  4. 2. Nonaxisymmetric experimental modal analysis and control of resistive wall MHD in RFPs : System identification and feedback control for the reversed-field pinch

    Author : K Erik J Olofsson; Per Brunsell; Marco Ariola; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Magnetic confinement fusion; Reversed-field pinch; System identification; Magnetohydrodynamics; Modal analysis; Automatic control; Resistive wall modes;

    Abstract : The reversed-field pinch (RFP) is a device for magnetic confinement of fusion plasmas. The main objective of fusion plasma research is to realise cost-effective thermonuclear fusion power plants. The RFP is highly unstable as can be explained by the theory of magnetohydrodynamics (MHD). READ MORE

  5. 3. Chemodynamical Simulations of Star-Forming Molecular Clouds

    Author : Chia-Jung Hsu; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; methods:numerical; magnetohydrodynamics; stars:formation; astrochemistry; ISM:clouds;

    Abstract : Stars are known to form from dense, dusty clumps and cores of molecular clouds. However, there is no consensus on a theory that can predict the rate of star formation, its clustering, and the conditions needed for massive stars to be born. A major challenge is how to observe and characterise the gas that is the fuel for star formation. READ MORE

  6. 4. Tearing mode dynamics in the presence of resonant magnetic perturbations

    Author : Richard Fridström; Per Brunsell; Marco Cecconello; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tearing mode; plasma; fusion; reversed-field pinch; RFP; magnetic; confinement; resonant; perturbation; magnetohydrodynamics; MHD; EXTRAP T2R; Madison Symmetic Torus; Fysik; Physics;

    Abstract : Magnetically confined fusion (MCF) plasmas are typically subject to several unstable modes. The growth of one mode can limit the plasma energy confinement and might cause a termination of the plasma. Externally applied resonant magnetic perturbations (RMPs) are used to control and to mitigate some of the unstable modes. READ MORE

  7. 5. Electric arc-contact interaction in high current gasblast circuit breakers

    Author : Torbjörn Nielsen; KTH; []
    Keywords : Electric arc; Contact evaporation; Near cathode region; Metal particles; CFD; Computational fluid dynamics; MHD; Magnetohydrodynamics;

    Abstract : .... READ MORE