On nodal point sets for Flux Reconstruction
File(s)manuscript.pdf (299.25 KB)
Accepted version
Author(s)
Witherden, Freddie
Vincent, Peter
Type
Journal Article
Abstract
Nodal point sets, and associated collocation projections, play an important role in a range of high-order methods, including Flux Reconstruction (FR) schemes. Historically, efforts have focused on identifying nodal point sets that aim to minimise the L ∞ error of an associated interpolating polynomial. The present work combines a comprehensive review of known approximation theory results, with new results, and numerical experiments, to motivate that in fact point sets for FR should aim to minimise the L² error of an associated interpolating polynomial. New results include identification of a nodal point set that minimises the L² norm of an interpolating polynomial, and a proof of the equivalence between such an interpolating polynomial and an L² approximating polynomial with coefficients obtained using a Gauss–Legendre quadrature rule. Numerical experiments confirm that FR errors can be reduced by an order-ofmagnitude by switching from popular point sets such as Chebyshev, Chebyshev–Lobatto and Legendre–Lobatto to Legendre point sets.
Date Issued
2021-01-01
Date Acceptance
2020-05-25
Citation
Journal of Computational and Applied Mathematics, 2021, 381, pp.1-14
ISSN
0377-0427
Publisher
Elsevier
Start Page
1
End Page
14
Journal / Book Title
Journal of Computational and Applied Mathematics
Volume
381
Copyright Statement
© 2020 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://www.sciencedirect.com/science/article/pii/S0377042720303058?via%3Dihub
Grant Number
EP/K027379/1
EP/R030340/1
Subjects
0102 Applied Mathematics
0103 Numerical and Computational Mathematics
0906 Electrical and Electronic Engineering
Numerical & Computational Mathematics
Publication Status
Published online
Date Publish Online
2020-06-05