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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 2024 MCQ for Mathematics of Computation is 1.78.

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A Filon-Clenshaw-Curtis-Smolyak rule for multi-dimensional oscillatory integrals with application to a UQ problem for the Helmholtz equation
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by Zhizhang Wu, Ivan G. Graham, Dingjiong Ma and Zhiwen Zhang;
Math. Comp.
DOI: https://doi.org/10.1090/mcom/4007
Published electronically: August 15, 2024

Abstract:

In this paper, we combine the Smolyak technique for multi-dimensional interpolation with the Filon-Clenshaw-Curtis (FCC) rule for one-dimensional oscillatory integration, to obtain a new Filon-Clenshaw-Curtis-Smolyak (FCCS) rule for oscillatory integrals with linear phase over the $d-$dimensional cube $[-1,1]^d$. By combining stability and convergence estimates for the FCC rule with error estimates for the Smolyak interpolation operator, we obtain an error estimate for the FCCS rule, consisting of the product of a Smolyak-type error estimate multiplied by a term that decreases with $\mathcal {O}(k^{-\widetilde {d}})$, where $k$ is the wavenumber and $\widetilde {d}$ is the number of oscillatory dimensions. If all dimensions are oscillatory, a higher negative power of $k$ appears in the estimate. As an application, we consider the forward problem of uncertainty quantification (UQ) for a one-space-dimensional Helmholtz problem with wavenumber $k$ and a random heterogeneous refractive index, depending in an affine way on $d$ i.i.d. uniform random variables. After applying a classical hybrid numerical-asymptotic approximation, expectations of functionals of the solution of this problem can be formulated as a sum of oscillatory integrals over $[-1,1]^d$, which we compute using the FCCS rule. We give numerical results for the FCCS rule which illustrate its theoretical properties and show that the accuracy of the UQ algorithm improves when both $k$ and the order of the FCCS rule increase. We also give results for both the quadrature and UQ problems when the underlying FCCS rule uses a dimension-adaptive Smolyak interpolation. These show increasing accuracy for the UQ problem as both the adaptive tolerance decreases and $k$ increases, requiring very modest increase in work as the stochastic dimension increases, for a case when the affine expansion in random variables decays quickly.
References
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Bibliographic Information
  • Zhizhang Wu
  • Affiliation: Department of Mathematics, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, People’s Republic of China
  • MR Author ID: 1162146
  • ORCID: 0000-0002-2591-0735
  • Email: wuzz@hku.hk
  • Ivan G. Graham
  • Affiliation: Department of Mathematical Sciences, University of Bath, Bath BA2 7AY, United Kingdom
  • MR Author ID: 76020
  • ORCID: 0000-0002-5730-676X
  • Email: I.G.Graham@bath.ac.uk
  • Dingjiong Ma
  • Affiliation: Department of Mathematics, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, People’s Republic of China
  • MR Author ID: 1327390
  • Email: martin35@connect.hku.hk
  • Zhiwen Zhang
  • Affiliation: Department of Mathematics, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, People’s Republic of China
  • Email: zhangzw@hku.hk
  • Received by editor(s): August 24, 2022
  • Received by editor(s) in revised form: September 17, 2023, and February 8, 2024
  • Published electronically: August 15, 2024
  • Additional Notes: The research of the second author was supported by UK EPSRC grant EP/S003975/1. The research of the fourth author was supported by the National Natural Science Foundation of China (Project 12171406), Hong Kong RGC grants (Projects 17300318, 17307921 and 17304324), the Outstanding Young Researcher Award of HKU (2020–21), and Seed Funding for Strategic Interdisciplinary Research Scheme 2021/22 (HKU)
  • © Copyright 2024 American Mathematical Society
  • Journal: Math. Comp.
  • MSC (2020): Primary 35C20, 42B20, 65D30, 65D32, 65D40
  • DOI: https://doi.org/10.1090/mcom/4007