A discrete collocation method for Symm's integral equation on curves with corners

✍ Scribed by Johannes Elschner; Ernst P. Stephan

• Book ID: 104338320
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 687 KB
• Volume: 75
• Category: Article
• ISSN: 0377-0427
• DOI: 10.1016/s0377-0427(96)00070-2

✦ Synopsis

This paper is devoted to the approximate solution of the classical first-kind boundary integral equation with logarithmic kernel (Symm's equation) on a closed polygonal boundary in •2. We propose a fully discrete method with a trial space of trigonometric polynomials, combined with a trapezoidal rule approximation of the integrals. Before discretization the equation is transformed using a nonlinear (mesh grading) parametrization of the boundary curve which has the effect of smoothing out the singularities at the comers and yields fast convergence of the approximate solutions. The convergence results are illustrated with some numerical examples.