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A direct approach for boundary integral equations with high‐order singularities
Author(s) -
Frangi A.,
Guiggiani M.
Publication year - 2000
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/1097-0207(20001110)49:7<871::aid-nme979>3.0.co;2-v
Subject(s) - gravitational singularity , mathematics , singular integral , integral equation , positive definiteness , mathematical analysis , boundary (topology) , numerical analysis , singular boundary method , singularity , boundary element method , physics , finite element method , eigenvalues and eigenvectors , quantum mechanics , positive definite matrix , thermodynamics
Boundary integral equations with extremely singular (i.e., more than hypersingular) kernels would be useful in several fields of applied mechanics, particularly when second‐ and third‐order derivatives of the primary variable are required. However, their definition and numerical treatment pose several problems. In this paper, it is shown how to obtain these boundary integral equations with still unnamed singularities and, moreover, how to efficiently and reliably compute all the singular integrals. This is done by extending in full generality the so‐called direct approach. Only for definiteness, the method is presented for the analysis of the deflection of thin elastic plates. Numerical results concerning integrals with singularities up to order r −4 are presented to validate the proposed algorithm. Copyright © 2000 John Wiley & Sons, Ltd.