Sökning: "Adaptive methods"

Visar resultat 1 - 5 av 425 avhandlingar innehållade orden Adaptive methods.

  1. 1. Adaptive variational multiscale methods

    Detta är en avhandling från Göteborg : Chalmers University of Technology

    Författare :Axel Målqvist; Göteborgs universitet.; Gothenburg University.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; finite element method; Galerkin; duality; a posteriori error estimation; adaptivity; variational multiscale method; mixed formulation; multi-physics; oil reservoir simulation;

    Sammanfattning : In this thesis we present a new adaptive multiscale method for solving elliptic partial differential equations. The method is based on numerical solution of decoupled local fine scale problems on patches. LÄS MER

  2. 2. Adaptive Finite Element Methods for Optimal Control Problems

    Detta är en avhandling från Göteborg : Chalmers University of Technology

    Författare :Karin Kraft; Göteborgs universitet.; Gothenburg University.; [2011]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; finite element method; discontinuous Galerkin method; optimal control; a posteriori error estimate; dual weighted residual; adaptive; multilevel algorithm; Newton method; control constraint; variational inequality; vehicle dynamics.;

    Sammanfattning : In this thesis we study the numerical solution of optimal control problems. The problems considered consist of a systemof differential equations, the state equations, which are governed bya control variable. The goal is to determine the states and controls which minimize a given cost functional. LÄS MER

  3. 3. Resilience in High Risk Work Analysing Adaptive Performance

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Amy Rankin; Linköpings universitet.; Linköpings universitet.; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Resilience Engineering; Safety Management; Adaptive Capacity; Improvisation;

    Sammanfattning : In today’s complexsocio-technical systems it is not possible to foresee and prepare for allfuture events. To cope with the intricacy and coupling between people,technical systems and the dynamic environment people are required tocontinuously adapt. LÄS MER

  4. 4. Adaptive Finite Element Methods for Compressible Two-Phase Flow

    Detta är en avhandling från Göteborg : Chalmers University of Technology

    Författare :Erik Burman; Göteborgs universitet.; Gothenburg University.; [1998]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; adaptive finite element methods; two-phase flow; compressible flow; conservation laws; hyperbolic systems; a posteriori error estimates; streamline diffusion; stability analysis; quantitative error control; adaptive algorithms;

    Sammanfattning : In this thesis we develop, apply and analyse adaptive finite element methods with error control for compressible flow problems, focusing in particular on two-phase flow. The adaptive algorithms, aiming at quantitative error control with efficient use of computational resources, are based on a posteriori error estimates, where the error is estimated in terms of the computed solution, the local mesh-size and certain stability factors. LÄS MER

  5. 5. Adaptive finite element methods for multiphysics problems

    Detta är en avhandling från Umeå : Institutionen för Matematik och matematisk statistik, Umeå universitet

    Författare :Fredrik Bengzon; Umeå universitet.; [2009]
    Nyckelord :finite element methods; multiphysics; a posteriori error estimation; duality; adaptivity; discontinuous Galerkin; fractional step methods;

    Sammanfattning : In this thesis we develop and analyze the performance ofadaptive finite element methods for multiphysics problems. Inparticular, we propose a methodology for deriving computable errorestimates when solving unidirectionally coupled multiphysics problemsusing segregated finite element solvers. LÄS MER