We present a family of high order trapezoidal rule-based quadratures for a class of singular integrals, where the integrand has a point singularity. The singular part of the integrand is expanded in a Taylor series involving terms of increasing smoothness. The quadratures are based on the trapezoidal rule, with the quadrature weights for Cartesian nodes close to the singularity judiciously corrected based on the expansion. High order accuracy can be achieved by utilizing a sufficient number of correction nodes around the singularity to approximate the terms in the series expansion. The derived quadratures are applied to the Implicit Boundary Integral formulation of surface integrals involving the Laplace layer kernels.
翻译:我们为一组单项整体组成了一个由高度有序的捕捉和分裂规则制成的象形体,该象体的原形具有点独一性。原形的独一部分在泰勒系列中扩大,涉及增加的光滑性。后方形以捕捉和分裂规则为基础,而笛卡尔节点的二次曲线重量接近根据扩展而合理纠正的独一性。如果利用足够数量的校正节点来接近序列扩展的单一性,则可以实现高度的顺序精确性。衍生的二次曲线用于隐性边界综合配方,即涉及拉帕特层内核的表面整体配方。