Abstract
We introduce a method for the computation of singular integrals arising in the discretization of integral equations. The basic method is based on the concept of admissible subdomains, known, e.g., from panel clustering techniques and 
-matrices: We split the domain of integration into a hierarchy of subdomains and perform standard quadrature on those subdomains that are amenable to it. By using additional properties of the integrand, we can significantly reduce the algorithmic complexity of our approach. The method works also well for hypersingular integrals.
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Börm, S., Hackbusch, W. Hierarchical Quadrature for Singular Integrals. Computing 74, 75–100 (2005). https://doi.org/10.1007/s00607-004-0076-0
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DOI: https://doi.org/10.1007/s00607-004-0076-0