Parallel 'Peer' two-step W-methods and their application to MOL-systems

  • Authors:
  • R. Weiner;B. A. Schmitt;H. Podhaisky

  • Affiliations:
  • FB Mathematik und Informatik, Martin-Luther-Universität Halle-Wittenberg, Postfach, 06099 Halle, Germany;Fachbereich Mathematik, Universität Marburg, Lahnberge, 35032 Marburg, Germany;FB Mathematik und Informatik, Martin-Luther-Universität Halle-Wittenberg, Postfach, 06099 Halle, Germany

  • Venue:
  • Applied Numerical Mathematics - Special issue: Workshop on innovative time integrators for PDEs
  • Year:
  • 2004

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Abstract

Parallel two-step W-methods are linearly-implicit integration methods where the s stage values can be computed in parallel. In this paper we consider a new class of two-step W-methods with s peer variables having almost identical characteristics. We discuss different types of such methods with order and stage order s - 1 or s and favourable stability properties. The new methods are more robust with respect to stepsize changes since they possess optimal damping at infinity. Numerical comparisons on a shared memory computer show the efficiency of the methods in combination with Krylov-techniques for MOL-systems.