A Well-Conditioned Hierarchical Basis for Triangular H(curl)-Conforming Elements
Jianguo Xin 1, Wei Cai 1*1 Department of Mathematics and Statistics, University of North Carolina, Charlotte, NC 28223, USA.
Received 22 March 2010; Accepted (in revised version) 3 June 2010
Available online 17 September 2010
We construct a well-conditioned hierarchical basis for triangular H(curl)-conforming elements with selected orthogonality. The basis functions are grouped into edge and interior functions, and the later is further grouped into normal and bubble functions. In our construction, the trace of the edge shape functions are orthonormal on the associated edge. The interior normal functions, which are perpendicular to an edge, and the bubble functions are both orthonormal among themselves over the reference element. The construction is made possible with classic orthogonal polynomials, viz., Legendre and Jacobi polynomials. For both the mass matrix and the quasi-stiffness matrix, better conditioning of the new basis is shown by a comparison with the basis previously proposed by Ainsworth and Coyle [Comput. Methods. Appl. Mech. Engrg., 190 (2001), 6709-6733].AMS subject classifications: 65N30, 65F35, 65F15
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Key words: Hierarchical bases, H(curl)-conforming elements, matrix conditioning, classic orthogonal polynomials.
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