WIAS Preprint No. 402, (1998)

Boundary Layer Approximate Approximations and Cubature of Potentials in Domains



Authors

  • Ivanov, Tjavdar
  • Maz´ya, Vladimir
  • Schmidt, Gunther

2010 Mathematics Subject Classification

  • 65D32 65D15 65N38

Keywords

  • Volume potentials, semi-analytic cubature formulae, approximate approximations, approximate multi-resolution

Abstract

In this article we present a new approach to the computation of volume potentials over bounded domains, which is based on the quasi-interpolation of the density by smooth, almost locally supported basis functions for which the corresponding volume potentials are known. The quasi-interpolant is a linear combination of the basis function with shifted and scaled arguments and with coefficients explicitly given by the point values of the density. Thus, the approach results in semi-analytic cubature formulae for volume potentials, which prove to be high order approximations of the integrals. It is based on multi-resolution schemes for accurate approximations up to the boundary by applying approximate refinement equations of the basis functions and iterative approximations on finer grids. We obtain asymptotic error estimates for the quasi-interpolation and corresponding cubature formulae and provide some numerical examples.

Appeared in

  • Adv. Comput. Math., 10 (1999) No. 3/4, pp. 311-342

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