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Analysis of the SORAS Domain Decomposition Preconditioner for Non-self-adjoint or Indefinite Problems

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Abstract

We analyze the convergence of the one-level overlapping domain decomposition preconditioner SORAS (Symmetrized Optimized Restricted Additive Schwarz) applied to a generic linear system whose matrix is not necessarily symmetric/self-adjoint nor positive definite. By generalizing the theory for the Helmholtz equation developed in Graham et al. (SIAM J Numer Anal 58(5):2515–2543, 2020. https://doi.org/10.1137/19M1272512), we identify a list of assumptions and estimates that are sufficient to obtain an upper bound on the norm of the preconditioned matrix, and a lower bound on the distance of its field of values from the origin. We stress that our theory is general in the sense that it is not specific to one particular boundary value problem. Moreover, it does not rely on a coarse mesh whose elements are sufficiently small. As an illustration of this framework, we prove new estimates for overlapping domain decomposition methods with Robin-type transmission conditions for the heterogeneous reaction–convection–diffusion equation (to prove the stability assumption for this equation we consider the case of a coercive bilinear form, which is non-symmetric, though).

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Notes

  1. Absorbing boundary conditions are approximations of transparent boundary conditions. Basic absorbing boundary conditions are Robin-type boundary conditions, which consist in a weighted combination of Neumann-type and Dirichlet-type boundary conditions. Their precise definition depends on the specific problem. For instance, for Maxwell equations impedance boundary conditions are Robin-type absorbing boundary conditions.

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Authors and Affiliations

  1. Inria, Centre de Mathématiques Appliquées, CNRS, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France

    Marcella Bonazzoli

  2. Laboratoire Jacques-Louis Lions, Sorbonne Université, CNRS, Inria, Université de Paris, 75005, Paris, France

    Xavier Claeys, Frédéric Nataf & Pierre-Henri Tournier

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  1. Marcella Bonazzoli
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  2. Xavier Claeys
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  3. Frédéric Nataf
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  4. Pierre-Henri Tournier
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Correspondence to Marcella Bonazzoli.

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Bonazzoli, M., Claeys, X., Nataf, F. et al. Analysis of the SORAS Domain Decomposition Preconditioner for Non-self-adjoint or Indefinite Problems. J Sci Comput 89, 19 (2021). https://doi.org/10.1007/s10915-021-01631-8

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  • DOI: https://doi.org/10.1007/s10915-021-01631-8

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