Search for dissertations about: "numerisk analys"

Showing result 1 - 5 of 317 swedish dissertations containing the words numerisk analys.

  1. 1. High Order Finite Difference Methods in Space and Time

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Wendy Kress; Uppsala universitet.; Uppsala universitet.; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; finite difference methods; Navier-Stokes equations; high order time discretization; deferred correction; stability; Numerical Analysis; Numerisk analys;

    Abstract : In this thesis, high order accurate discretization schemes for partial differential equations are investigated.In the first paper, the linearized two-dimensional Navier-Stokes equations are considered. READ MORE

  2. 2. Domain Decomposition and Preconditioned Iterative Methods for the Helmholtz Equation

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Elisabeth Larsson; Uppsala universitet.; Uppsala universitet.; [2000]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Helmholtz equation; domain decomposition; preconditioned iterative method; fast transforms; parallelization; Numerical Analysis; Numerisk analys;

    Abstract : New preconditioned iterative solution methods for the Helmholtz equation are constructed. To evaluate the performance of the methods, two-dimensional problems with a waveguide geometry are used as model problems. Second- and fourth-order accurate finite difference discretizations are used. READ MORE

  3. 3. Initial-Boundary-Value Problems for the Stokes and Navier–Stokes Equations on Staggered Grids

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Jonas Nilsson; Uppsala universitet.; Uppsala universitet.; [2000]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Stokes equations; Navier-Stokes equations; boundary conditions; staggered grids; higher-order methods; Numerical Analysis; Numerisk analys;

    Abstract : In the first part of the thesis various types of boundary conditions for the steady state Stokes equations are considered. We formulate the boundary conditions in a new way, such that the boundary value problem becomes non-singular, and derive estimates of the solution. READ MORE

  4. 4. Fast Numerical Techniques for Electromagnetic Problems in Frequency Domain

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Martin Nilsson; Uppsala universitet.; Uppsala universitet.; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fast Multipole Method; Minimal Residual Interpolation; Sparse Approximate Inverse preconditioning; Method of Moments; fast solvers; iterative methods; multiple right-hand sides; error analysis; Numerical Analysis; Numerisk analys;

    Abstract : The Method of Moments is a numerical technique for solving electromagnetic problems with integral equations. The method discretizes a surface in three dimensions, which reduces the dimension of the problem with one. A drawback of the method is that it yields a dense system of linear equations. READ MORE

  5. 5. Numerical Techniques for Acoustic Modelling and Design of Brass Wind Instruments

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Daniel Noreland; Uppsala universitet.; Uppsala universitet.; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Acoustic horn; brass wind instrument; loudspeaker; optimization; hybrid method; Numerical Analysis; Numerisk analys;

    Abstract : Acoustic horns are used in musical instruments and loudspeakers in order to provide an impedance match between an acoustic source and the surrounding air. The aim of this study is to develop numerical tools for the analysis and optimisation of such horns, with respect to their input impedance spectra. READ MORE