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St. Petersburg Mathematical Journal

This journal is a cover-to-cover translation into English of Algebra i Analiz, published six times a year by the mathematics section of the Russian Academy of Sciences.

ISSN 1547-7371 (online) ISSN 1061-0022 (print)

The 2020 MCQ for St. Petersburg Mathematical Journal is 0.68.

What is MCQ? The Mathematical Citation Quotient (MCQ) measures journal impact by looking at citations over a five-year period. Subscribers to MathSciNet may click through for more detailed information.

 

A posteriori estimates for the stationary Stokes problem in exterior domains
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by D. Pauly and S. Repin
St. Petersburg Math. J. 31 (2020), 533-555
DOI: https://doi.org/10.1090/spmj/1613
Published electronically: April 30, 2020

Abstract:

This paper is concerned with the analysis of the inf-sup condition arising in the stationary Stokes problem in exterior domains and applications to the derivation of computable bounds for the distance between the exact solution of the exterior Stokes problem and a certain approximation (which may be of a rather general form). In the first part, guaranteed bounds are deduced for the constant in the stability lemma associated with the exterior domain. These bounds depend only on known constants and the stability constant related to bounded domains that arise after suitable truncations of the unbounded domains. The lemma in question implies computable estimates of the distance to the set of divergence free fields defined in exterior domains. Such estimates are crucial for the derivation of computable majorants of the difference between the exact solution of the Stokes problem in exterior domains and an approximation from the admissible (energy) class of functions satisfying the Dirichlet boundary condition but not necessarily divergence free (solenoidal). Estimates of this type are often called a posteriori estimates of functional type. The constant in the stability lemma (or equivalently in the inf-sup or LBB condition) serves as a penalty factor at the term that controls violations of the divergence free condition. In the last part of the paper, similar estimates are deduced for the distance to the exact solution for nonconforming approximations, i.e., for those that may violate some continuity and boundary conditions. The case where the dimension of the domain equals $2$ requires a special consideration because the corresponding weighted spaces differ from those natural for the dimension $3$ (or larger). This special case is briefly discussed at the end of the paper where similar estimates are deduced for the distance to the exact solution of the exterior Stokes problem.
References
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Bibliographic Information
  • D. Pauly
  • Affiliation: Fakultät für Mathematik, Universität Duisburg-Essen, Campus Essen, Germany; Faculty of Information Technology, University of Jyväskylä, Finland
  • Email: dirk.pauly@uni-due.de
  • S. Repin
  • Affiliation: Steklov Institute of Mathematics, St. Petersburg, Russia; Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia; Faculty of Information Technology, University of Jyväskylä, Finland
  • Email: repin@pdmi.ras.ru
  • Received by editor(s): November 1, 2018
  • Published electronically: April 30, 2020

  • Dedicated: Dedicated to the memory of S. G. Mikhlin
  • © Copyright 2020 American Mathematical Society
  • Journal: St. Petersburg Math. J. 31 (2020), 533-555
  • MSC (2010): Primary 35J57, 65N15, 76D07
  • DOI: https://doi.org/10.1090/spmj/1613
  • MathSciNet review: 3985925