Sökning: "elastic wave equation"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden elastic wave equation.

  1. 1. Numerics of Elastic and Acoustic Wave Motion

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Kristoffer Virta; Uppsala universitet.; Uppsala universitet.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; finite differences; stability; high order accuracy; elastic wave equation; acoustic wave equation; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Sammanfattning : The elastic wave equation describes the propagation of elastic disturbances produced by seismic events in the Earth or vibrations in plates and beams. The acoustic wave equation governs the propagation of sound. LÄS MER

  2. 2. Elastic wave scattering from corrugated surfaces in anisotropic media

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Tatiana Krasnova; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; corrugated surface; perturbation approach; scattering; anisotropy; ultrasonic waves; null field approach; integral equation; Green s function;

    Sammanfattning : .... LÄS MER

  3. 3. High Order Cut Finite Element Methods for Wave Equations

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Simon Sticko; Uppsala universitet.; Uppsala universitet.; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cut finite element; Wave equation; Immersed; Fictitious domain; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Sammanfattning : This thesis considers wave propagation problems solved using finite element methods where a boundary or interface of the domain is not aligned with the computational mesh. Such methods are usually referred to as cut or immersed methods. LÄS MER

  4. 4. Finite Difference and Discontinuous Galerkin Methods for Wave Equations

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Siyang Wang; Uppsala universitet.; Uppsala universitet.; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wave propagation; Finite difference method; Discontinuous Galerkin method; Stability; Accuracy; Summation by parts; Normal mode analysis; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Sammanfattning : Wave propagation problems can be modeled by partial differential equations. In this thesis, we study wave propagation in fluids and in solids, modeled by the acoustic wave equation and the elastic wave equation, respectively. LÄS MER

  5. 5. Perfectly Matched Layers and High Order Difference Methods for Wave Equations

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Kenneth Duru; Uppsala universitet.; Uppsala universitet.; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis; Elastic waves; Surface waves; Perfectly matched layers; High order difference methods; Stability; Summation-by-parts operators; Boundary treatments;

    Sammanfattning : The perfectly matched layer (PML) is a novel technique to simulate the absorption of waves in unbounded domains. The underlying equations are often a system of second order hyperbolic partial differential equations. In the numerical treatment, second order systems are often rewritten and solved as first order systems. LÄS MER