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Mathematics of Computation

Published by the American Mathematical Society since 1960 (published as Mathematical Tables and other Aids to Computation 1943-1959), Mathematics of Computation is devoted to research articles of the highest quality in computational mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2020 MCQ for Mathematics of Computation is 1.78.

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 positivity-preserving, energy stable and convergent numerical scheme for the Poisson-Nernst-Planck system
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by Chun Liu, Cheng Wang, Steven M. Wise, Xingye Yue and Shenggao Zhou HTML | PDF
Math. Comp. 90 (2021), 2071-2106 Request permission

Abstract:

In this paper we propose and analyze a finite difference numerical scheme for the Poisson-Nernst-Planck equation (PNP) system. To understand the energy structure of the PNP model, we make use of the Energetic Variational Approach (EnVarA), so that the PNP system could be reformulated as a non-constant mobility $H^{-1}$ gradient flow, with singular logarithmic energy potentials involved. To ensure the unique solvability and energy stability, the mobility function is explicitly treated, while both the logarithmic and the electric potential diffusion terms are treated implicitly, due to the convex nature of these two energy functional parts. The positivity-preserving property for both concentrations, $n$ and $p$, is established at a theoretical level. This is based on the subtle fact that the singular nature of the logarithmic term around the value of $0$ prevents the numerical solution reaching the singular value, so that the numerical scheme is always well-defined. In addition, an optimal rate convergence analysis is provided in this work, in which many highly non-standard estimates have to be involved, due to the nonlinear parabolic coefficients. The higher order asymptotic expansion (up to third order temporal accuracy and fourth order spatial accuracy), the rough error estimate (to establish the $\ell ^\infty$ bound for $n$ and $p$), and the refined error estimate have to be carried out to accomplish such a convergence result. In our knowledge, this work will be the first to combine the following three theoretical properties for a numerical scheme for the PNP system: (i) unique solvability and positivity, (ii) energy stability, and (iii) optimal rate convergence. A few numerical results are also presented in this article, which demonstrates the robustness of the proposed numerical scheme.
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Additional Information
  • Chun Liu
  • Affiliation: Department of Applied Mathematics, Illinois Institute of Technology, Chicago, Illinois 60616
  • MR Author ID: 362496
  • Email: cliu124@iit.edu
  • Cheng Wang
  • Affiliation: Department of Mathematics, University of Massachusetts, North Dartmouth, Massachusetts 02747
  • MR Author ID: 652762
  • Email: cwang1@umassd.edu
  • Steven M. Wise
  • Affiliation: Department of Mathematics, The University of Tennessee, Knoxville, Tennessee 37996
  • MR Author ID: 615795
  • ORCID: 0000-0003-3824-2075
  • Email: swise1@utk.edu
  • Xingye Yue
  • Affiliation: Department of Mathematics, Soochow University, Suzhou 215006, People’s Republic of China
  • Email: xyyue@suda.edu.cn
  • Shenggao Zhou
  • Affiliation: School of Mathematical Sciences and MOE-LSC, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China
  • ORCID: 0000-0001-9097-8392
  • Email: sgzhou@sjtu.edu.cn
  • Received by editor(s): September 11, 2020
  • Received by editor(s) in revised form: December 27, 2020
  • Published electronically: June 15, 2021
  • Additional Notes: This work was supported in part by the National Science Foundation (USA) grants NSF DMS-1759535, NSF DMS-1759536 (first author), NSF DMS-2012669 (second author), NSF DMS-1719854, DMS-2012634 (third author), National Natural Science Foundation of China 11971342 (fourth author), NSFC 21773165, Natural Science Foundation of Jiangsu Province (BK20200098), China, Young Elite Scientist Sponsorship Program by Jiangsu Association for Science and Technology, and National Key R&D Program of China 2018YFB0204404 (fifth author).
    The fifth author is the corresponding author
  • © Copyright 2021 American Mathematical Society
  • Journal: Math. Comp. 90 (2021), 2071-2106
  • MSC (2020): Primary 35K35, 35K55, 49J40, 65M06, 65M12
  • DOI: https://doi.org/10.1090/mcom/3642
  • MathSciNet review: 4280293