Search for dissertations about: "Schur complement approximation"
Showing result 1 - 5 of 7 swedish dissertations containing the words Schur complement approximation.
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1. Analysis and Implementation of Preconditioners for Prestressed Elasticity Problems : Advances and Enhancements
Abstract : In this work, prestressed elasticity problem as a model of the so-called glacial isostatic adjustment (GIA) process is studied. The model problem is described by a set of partial differential equations (PDE) and discretized with a mixed finite element (FE) formulation. READ MORE
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2. Robust Preconditioners Based on the Finite Element Framework
Abstract : Robust preconditioners on block-triangular and block-factorized form for three types of linear systems of two-by-two block form are studied in this thesis. The first type of linear systems, which are dense, arise from a boundary element type of discretization of crack propagation problems. READ MORE
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3. Developments in preconditioned iterative methods with application to glacial isostatic adjustment models
Abstract : This study examines the block lower-triangular preconditioner with element-wise Schur complement as the lower diagonal block applied on matrices arising from an application in geophysics. The element-wise Schur complement is a special approximation of the exact Schur complement that can be constructed in the finite element framework. READ MORE
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4. Implementation of the spectral element method and iterative solution techniques for 3D controlled-source electromagnetic modelling
Abstract : Controlled-source electromagnetic methods are imaging techniques applied at/on the surface of the Earth which record the electromagnetic field in order to assess the electrical conductivity distribution of the Earth’s subsurface, along with anomalies in this material property, as well as to characterise and interpret structures in Earth’s crust. Extracting information from the recorded electromagnetic data requires inverse modelling algorithms. READ MORE
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5. Robust preconditioning methods for algebraic problems, arising in multi-phase flow models
Abstract : The aim of the project is to construct, analyse and implement fast and reliable numerical solution methods to simulate multi-phase flow, modeled by a coupled system consisting of the time-dependent Cahn-Hilliard and incompressible Navier-Stokes equations with variable viscosity and variable density. This thesis mainly discusses the efficient solution methods for the latter equations aiming at constructing preconditioners, which are numerically and computationally efficient, and robust with respect to various problem, discretization and method parameters. READ MORE