The Deflation Accelerated Schwarz Method for CFD

  • J. Verkaik
  • C. Vuik
  • B. D. Paarhuis
  • A. Twerda
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3514)

Abstract

Accurate simulation of glass melting furnaces requires the solution of very large linear algebraic systems of equations. To solve these equations efficiently a Schwarz domain decomposition (multi-block) method can be used. However, it can be observed that the convergence of the Schwarz method deteriorates when a large number of subdomains is used. This is due to small eigenvalues arising from the domain decomposition which slow down the convergence. Recently, a deflation approach was proposed to solve this problem using constant approximate eigenvectors. This paper generalizes this view to piecewise linear vectors and results for two CFD problems are presented. It can be observed that the number of iterations and wall clock time decrease considerably. The reason for this is that the norm of the initial residual is much smaller and the rate of convergence is higher.

Keywords

efficiency computational fluid dynamics domain decomposition deflation Krylov subspace acceleration 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • J. Verkaik
    • 1
  • C. Vuik
    • 2
  • B. D. Paarhuis
    • 1
  • A. Twerda
    • 1
  1. 1.TNO Science and IndustryDelftThe Netherlands
  2. 2.Faculty of Electrical Engineering, Mathematics and Computer ScienceDelft University of TechnologyDelftThe Netherlands

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