| Full text | |
| Author(s): |
Castro, Douglas A.
[1]
;
Devloo, Philippe R. B.
[2]
;
Farias, Agnaldo M.
[3]
;
Gomes, Sonia M.
[3]
;
Duran, Omar
[4]
Total Authors: 5
|
| Affiliation: | [1] Univ Fed Tocantins Campus Gurupi, State Of Tocantins, TO - Brazil
[2] Univ Estadual Campinas, FEC, Campinas, SP - Brazil
[3] Univ Estadual Campinas, IMECC, Campinas, SP - Brazil
[4] Univ Estadual Campinas, FEM, Campinas, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Journal of Computational and Applied Mathematics; v. 301, p. 241-258, AUG 1 2016. |
| Web of Science Citations: | 6 |
| Abstract | |
The mixed finite element formulation for elliptic problems is characterized by simultaneous calculations of the potential (primal variable) and of the flux field (dual variable). This work focuses on new H(div)-conforming finite element spaces, which are suitable for flux approximations, based on curved meshes of a planar region or a manifold domain embedded in R-3. The adopted methodology for the construction of H(div) bases consists in using hierarchical H-1-conforming scalar bases multiplied by vector fields that are properly constructed on the master element and mapped to the geometrical elements by the Piola transformation, followed by a normalization procedure. They are classified as being of edge or internal type. The normal component of an edge function coincides on the corresponding edge with the associated scalar shape function, and vanishes over the other edges, and the normal components of an internal shape function vanishes on all element edges. These properties are fundamental for the global assembly of H(div)-conforming functions locally defined by these vectorial shape functions. For applications to the mixed formulation, the configuration of the approximation spaces is such that the divergence of the dual space and the primal approximation space coincides. Results of verification numerical tests are presented for curved triangular and quadrilateral partitions on circular, cylindrical and spherical regions, demonstrating stable convergence with optimal convergence rates, coinciding for primal and dual variables. (C) 2016 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 13/21959-4 - Construction of finite element spaces in Hdiv for three- dimensional geometries |
| Grantee: | Douglas Azevedo Castro |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |