6533b832fe1ef96bd129a13c
RESEARCH PRODUCT
On Computational Properties of a Posteriori Error Estimates Based upon the Method of Duality Error Majorants
Pekka NeittaanmäkiM. E. FrolovSergey Repinsubject
Mathematical optimizationElliptic operatorDistribution (mathematics)Series (mathematics)Basis (linear algebra)Duality (mathematics)Applied mathematicsA priori and a posterioriPolygon meshCalculus of variationsMathematicsdescription
In the present paper, we analyze computational properties of the functional type a posteriori error estimates that have been derived for elliptic type boundary-value problems by duality theory in calculus of variations. We are concerned with the ability of this type of a posteriori estimates to provide accurate upper bounds of global errors and properly indicate the distribution of local ones. These questions were analyzed on a series of boundary-value problems for linear elliptic operators of 2nd and 4th order. The theoretical results are confirmed by numerical tests in which the duality error majorant for the classical diffusion problem is compared with the standard error indicator used in the MATLAB PDE Toolbox. Numerical tests performed show that the meshes generated on the basis of the majorant are very close to those that would be computed if on each step of the mesh refinement process we knew the exact error distribution. At the same time, meshes generated by the MATLAB code may considerably differ from them.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-01-01 |