Search for dissertations about: "Fictitious domain"

Showing result 1 - 5 of 8 swedish dissertations containing the words Fictitious domain.

  2. 1. High Order Cut Finite Element Methods for Wave Equations

    Author : Simon Sticko; Gunilla Kreiss; Mats G. Larson; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Cut finite element; Wave equation; Immersed; Fictitious domain; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Abstract : 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. READ MORE

  4. 2. Approximation of topology optimization problems using sizing optimization problems

    Author : Anton Evgrafov; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; structural optimization; bilevel programming; approximation; topology optimization; control in coefficients; optimal design; fictitious domain; control in coefficients;

    Abstract : The present work is devoted to approximation techniques for singular extremal problems arising from optimal design problems in structural and fluid mechanics. The thesis consists of an introductory part and four independent papers, which however are united by the common idea of approximation and the related application areas. READ MORE

  5. 3. Boundary Shape Optimization Using the Material Distribution Approach

    Author : Fotios Kasolis; Martin Berggren; Eddie Wadbro; Mats Larson; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Design optimization; Helmholtz equation; linear elasticity; FEM; fictitious domain methods;

    Abstract : .... READ MORE

  6. 4. The material distribution method : analysis and acoustics applications

    Author : Fotios Kasolis; Martin Berggren; Volker Schulz; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material distribution method; fictitious domain method; finite element method; Helmholtz equation; linear elasticity; shape optimization; topology optimization;

    Abstract : For the purpose of numerically simulating continuum mechanical structures, different types of material may be represented by the extreme values {,1}, where 0.... READ MORE

  7. 5. Investigation of a discrete ordinates method for neutron noise simulations in the frequency domain

    Author : Huaiqian Yi; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Deterministic neutron transport; Neutron noise; Ray effects; Numerical acceleration; Discrete ordinates method;

    Abstract : During normal operations of a nuclear reactor, neutron flux measurements show small fluctuations around mean values, the so-called neutron noise. These fluctuations may be driven by a variety of perturbations, e.g., mechanical vibrations of core components. READ MORE