Proceedings chapter

The Domain Decomposition Method of Bank and Jimack as an Optimized Schwarz Method

Published inDomain decomposition methods in science and engineering XXV, Editors Haynes, Ronald, p. 285-293
Presented at proceedings of the 25th International Conference on Domain Decomposition Methods in Science and Engineering, St. John's, Newfoundland, Canada, July 2018
PublisherCham : Springer
  • Lecture Notes in Computational Science and Engineering; 138
Publication date2020-10-25
First online date2020-10-25

In [10] we defined a new partition of unity for the Bank-Jimack domain decomposition method in 1D and proved that with the new partition of unity, the Bank-Jimack method in an optimal Schwarz method in 1D and thus coverges in two iterations for two subdomains: it becomes a direct solver, and this idenpendently of the outer coarse mesh one uses! In this paper, we show that the Bank-Jimack method in 2D is an optimized Schwarz method and its convergence behavior depends on the structure of the outer coarse mesh it subdomain is using. For an equally spaced coarse mesh its convergence behavior is not as good as the convergence behavior of optimized Schwarz. However, if a stretched coarse mesh is used, then the Bank-Jimack method becomes faster then optimized Schwarz with Robin or Ventcell transmission conditions. Our analysis leads to a conjecture stating that the convergence factor of the Bank-Jimack method with overlap L and m geometrically stretched outer coarse mesh cells is 1 - O(L 1/2m).

  • Optimized Schwarz method
  • Bank-Jimack method
  • Domain decomposition methods
  • Poisson equation
Citation (ISO format)
CIARAMELLA, Gabriele, GANDER, Martin Jakob, MAMOOLER, Parisa. The Domain Decomposition Method of Bank and Jimack as an Optimized Schwarz Method. In: Domain decomposition methods in science and engineering XXV. St. John’s, Newfoundland, Canada. Cham : Springer, 2020. p. 285–293. (Lecture Notes in Computational Science and Engineering) doi: 10.1007/978-3-030-56750-7_32
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Proceedings chapter (Accepted version)

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