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Nonlinear Theory and Its Applications, IEICE
Vol. 5 (2014) No. 1 pp. 53-63



Special section on Recent Progress in Verified Numerical Computations

For Poisson's equation over a polygonal domain of general shape, the solution of which may have a singularity around re-entrant corners, we provide an explicit a priori error estimate for the approximate solution obtained by finite element methods of high degree. The method used herein is a direct extension of the one developed in preceding paper of the second and third listed authors, which provided a new approach to deal with the singularity by using linear finite elements. In the present paper, we also give a detailed discussion of the dependency of the convergence order on solution singularities, mesh sizes and degrees of the finite element method used.

Copyright © 2014 The Institute of Electronics, Information and Communication Engineers

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