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Integration over discrete closed surfaces using the method of fundamental solutions
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Lockerby, Duncan A. (2022) Integration over discrete closed surfaces using the method of fundamental solutions. Engineering Analysis with Boundary Elements, 136 . pp. 232-237. doi:10.1016/j.enganabound.2021.12.013 ISSN 0955-7997.
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Official URL: https://doi.org/10.1016/j.enganabound.2021.12.013
Abstract
The Method of Fundamental Solutions (MFS) is an established technique for solving linear partial differential equations. In this paper it is used for a new purpose: the approximation of integrals over closed surfaces from a finite set of known points and values. The MFS is used to fit an implicit surface through the surface points, where the implicit equation is chosen such that a surface integral is provided by summing the weights of the fit. From the divergence theorem, these surface integrals can be related to specific integrals over the enclosed volume. As a demonstration, we calculate the surface area, volume, centroid and radius of gyration, for three solid geometries: a sphere, a torus, and an ellipsoid. Very quick convergence to analytical results is shown. Local surface properties, such as the components of curvature, can also be obtained accurately. The drawbacks and advantages of the method are discussed, and the potential to calculate properties of constant-density rigid bodies (e.g. the moment of inertia tensor) and averages of incompressible flow fields (e.g. average flow velocity and strain rate) is highlighted.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QA Mathematics T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
Library of Congress Subject Headings (LCSH): | Differential equations, Partial, Numerical integration, Surfaces -- Mathematics, Integrals | |||||||||
Journal or Publication Title: | Engineering Analysis with Boundary Elements | |||||||||
Publisher: | Elsevier Inc. | |||||||||
ISSN: | 0955-7997 | |||||||||
Official Date: | March 2022 | |||||||||
Dates: |
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Volume: | 136 | |||||||||
Page Range: | pp. 232-237 | |||||||||
DOI: | 10.1016/j.enganabound.2021.12.013 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 22 December 2021 | |||||||||
Date of first compliant Open Access: | 18 January 2023 | |||||||||
RIOXX Funder/Project Grant: |
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