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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.

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A diffusion generated method for orthogonal matrix-valued fields
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by Braxton Osting and Dong Wang HTML | PDF
Math. Comp. 89 (2020), 515-550 Request permission

Abstract:

We consider the problem of finding stationary points of the Dirichlet energy for orthogonal matrix-valued fields. Following the Ginzburg-Landau approach, this energy is relaxed by penalizing the matrix-valued field when it does not take orthogonal matrix values. A generalization of the Merriman-Bence-Osher (MBO) diffusion generated method is introduced that effectively finds local minimizers of this energy by iterating two steps until convergence. In the first step, as in the original method, the current matrix-valued field is evolved by the diffusion equation. In the second step, the field is pointwise reassigned to the closest orthogonal matrix, which can be computed via the singular value decomposition. We extend the Lyapunov function of Esedoglu and Otto to show that the method is non-increasing on iterates and hence, unconditionally stable. We also prove that spatially discretized iterates converge to a stationary solution in a finite number of iterations. The algorithm is implemented using the closest point method and non-uniform fast Fourier transform. We conclude with several numerical experiments on flat tori and closed surfaces, which, unsurprisingly, exhibit classical behavior from the Allen-Cahn and complex Ginzburg-Landau equations, but also new phenomena.
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Additional Information
  • Braxton Osting
  • Affiliation: Department of Mathematics, University of Utah, Salt Lake City, Utah 84112
  • MR Author ID: 876194
  • ORCID: 0000-0002-4123-9048
  • Email: osting@math.utah.edu
  • Dong Wang
  • Affiliation: Department of Mathematics, University of Utah, Salt Lake City, Utah 84112
  • Email: dwang@math.utah.edu
  • Received by editor(s): December 13, 2017
  • Received by editor(s) in revised form: August 1, 2018, March 27, 2019, and May 17, 2019
  • Published electronically: September 24, 2019
  • Additional Notes: The first author was partially supported by NSF DMS 16-19755 and 17-52202.
  • © Copyright 2019 American Mathematical Society
  • Journal: Math. Comp. 89 (2020), 515-550
  • MSC (2010): Primary 35K93, 35K05, 65M12
  • DOI: https://doi.org/10.1090/mcom/3473
  • MathSciNet review: 4044441