Abstract
In this paper, we present two variants of the Additive Schwarz Method (ASM) for a Crouzeix-Raviart finite volume (CRFV) discretization of the second order elliptic problem with discontinuous coefficients, where the discontinuities are only across subdomain boundaries. The resulting system, which is nonsymmetric, is solved using the preconditioned GMRES iteration, where in one variant of the ASM the preconditioner is symmetric while in the other variant it is nonsymmetric. The proposed methods are almost optimal, in the sense that the convergence of the GMRES iteration, in the both cases, depend only poly-logarithmically on the mesh parameters.
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Acknowledgements
This work was partially supported by Polish Scientific Grant 2011/01/B/ ST1/01179 and Chinese Academy of Science Project: 2013FFGA0009 - GJHS20140901004635677.
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Marcinkowski, L., Loneland, A., Rahman, T. (2016). Schwarz Methods for a Crouzeix-Raviart Finite Volume Discretization of Elliptic Problems. In: Dickopf, T., Gander, M., Halpern, L., Krause, R., Pavarino, L. (eds) Domain Decomposition Methods in Science and Engineering XXII. Lecture Notes in Computational Science and Engineering, vol 104. Springer, Cham. https://doi.org/10.1007/978-3-319-18827-0_61
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DOI: https://doi.org/10.1007/978-3-319-18827-0_61
Publisher Name: Springer, Cham
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