Sökning: "algebraic multigrid"

Hittade 3 uppsatser innehållade orden algebraic multigrid.

  1. 1. Smoothed Aggregation for Nonsymmetric Linear Systems

    Master-uppsats, Lunds universitet/Matematik LTH; Lunds universitet/Matematikcentrum

    Författare :Siobhan Correnty; [2019]
    Nyckelord :Mathematics and Statistics;

    Sammanfattning : Smoothed Aggregation (SA) is a technique from algebraic multigrid methods (AMG) which has shown very promising results when solving systems of linear equations with symmetric system matrices, but suboptimal results for nonsymmetric system matrices. The purpose of this thesis is to investigate the method EMIN(r) and a closely related method EMIN proposed by Sala and Tuminaro. LÄS MER

  3. 2. Algebraic multigrid for a mass-consistent wind model, the Nordic Urban Dispersion model

    Master-uppsats, Umeå universitet/Institutionen för fysik

    Författare :Markus Pogulis; [2015]
    Nyckelord :Mass-consistent model; urban environment; numerical method; algebraic multigrid;

    Sammanfattning : In preparation for, and for decision support during, CBRN (chemical, biological, radiological and nuclear) emergencies it is essential to know how such an event would turn out, so that one can prepare a possible evacuation. Afterwards it might be good to know how to backtrack and see what caused the emergency, and in the case of e.g. LÄS MER

  4. 3. Numerical methods for glacial isostatic adjustment  models

    Master-uppsats, Institutionen för informationsteknologi

    Författare :Juan Carlos Araujo-Cabarcas; [2013]
    Nyckelord :;

    Sammanfattning : Nordic countries experience post-glacial rebound, a movement where geographical contours slowly change elevation with respect to the mean sea level. The glacial isostatic adjustment (GIA) model aims to explain the phenomena, which combined with seismic data allows geoscientists to reconstruct elastic coefficients and viscosities of the Earth's lithosphere and upper mantle. LÄS MER