Developments in Overlapping Schwarz Preconditioning of High-Order Nodal Discontinuous Galerkin Discretizations
Recent progress has been made to more robustly handle the increased complexity of high-order schemes by focusing on the local nature of the discretization. This locality is particularly true for many Discontinuous Galerkin formulations and is the focus of this paper. The contributions of this paper are twofold. First, novel observations regarding various flux representations in the discontinuous Galerkin formulation are highlighted in the context of overlapping Schwarz methods. Second, we conduct additional experiments using high-order elements for the indefinite Helmholtz equation to expose the impact of overlap.
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- 2.X.-C. Cai, A family of overlapping Schwarz algorithms for nonsymmetric and indefinite elliptic problems, in Domain-based parallelism and problem decomposition methods in computational science and engineering, D. E. Keyes, Y. Saad, and D. G. Truhlar, eds., SIAM, Philadelphia, PA, 1995, pp. 1–19.Google Scholar
- 3.X.-C. Cai, M. A. Casarin, F. W. Elliott Jr., and O. B. Widlund, Overlapping Schwarz algorithms for solving Helmholtz's equation, in Domain decomposition methods, 10 (Boulder, CO, 1997), vol. 218 of Contemp. Math., AMS, Providence, RI, 1998, pp. 391–399.Google Scholar
- 7.R. M. Kirby, Toward dynamic spectral/hp refinement: algorithms and applications to flow-structure interactions, PhD thesis, Brown University, May 2003.Google Scholar
- 8.C. Lasser and A. Toselli, Overlapping preconditioners for discontinuous Galerkin approximations of second order problems, in Thirteenth international conference on domain decomposition, N. Debit, M. Garbey, R. Hoppe, J. Pèriaux, D. Keyes, and Y. Kuznetsov, eds., ddm.org, 2001, pp. 78–84.Google Scholar
- 9.J. W. Lottes and P. F. Fischer, Hybrid multigrid/Schwarz algorithms for the spectral element method, Tech. Rep. ANL/MCS-P1052–0403, Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, IL, May 2003.Google Scholar
- 10.A. Toselli and O. B. Widlund, Domain Decomposition Methods - Algorithms and Theory, vol. 34 of Series in Computational Mathematics, Springer, 2005.Google Scholar