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Isoparametric singularity extraction technique for 3D potential problems in BEM
ID Kanduč, Tadej (Author)

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Abstract
To solve boundary integral equations for potential problems using collocation Boundary Element Method (BEM) on smooth curved 3D geometries, an analytical singularity extraction technique is employed. By adopting the isoparametric approach, curved geometries that are represented by mapped rectangles or triangles from the parametric domain are considered. The singularity extraction on the governing singular integrals can be performed either as an operation of subtraction or division, each having some advantage. A particular series expansion of a singular kernel about a source point is investigated. The series in the parametric coordinates consists of functions of a type $R^px^qy^r$, where $R$ is a square root of a quadratic bivariate homogeneous polynomial with coefficients corresponding to the first fundamental form of a smooth surface, and $p, q, r$ are integers, satisfying $p \le -1$ and $q, r \ge 0$. By extracting more terms from the series expansion of the singular kernel, the smoothness of the regularized kernel at the source point can be increased. Analytical formulae for integrals of such terms are obtained from antiderivatives of $R^px^qy^r$, using recurrence formulae, and by evaluating them at the edges of rectangular or triangular parametric domains. Numerical tests demonstrate that the singularity extraction technique can be a useful prerequisite for a numerical quadrature scheme to obtain high order of convergence for the governing singular integrals in 3D collocation BEM with respect to the number of quadrature nodes or with respect to size of the discretization mesh cells.

Language:English
Keywords:analytical integration, singular integral, singularity extraction, boundary element method, isogeometric analysis
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2022
Number of pages:25 str.
Numbering:Vol. 398, art. 115271
PID:20.500.12556/RUL-144095 This link opens in a new window
UDC:519.651
ISSN on article:0045-7825
DOI:10.1016/j.cma.2022.115271 This link opens in a new window
COBISS.SI-ID:139374339 This link opens in a new window
Publication date in RUL:31.01.2023
Views:612
Downloads:129
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Record is a part of a journal

Title:Computer methods in applied mechanics and engineering
Shortened title:Comput. methods appl. mech. eng.
Publisher:Elsevier
ISSN:0045-7825
COBISS.SI-ID:6695685 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:analitična integracija, singularni integral, ekstrakcija singularnosti, metoda končnih elementov, izogeometrična analiza

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