A mixed formulation for 3D magnetostatic problems: theoretical analysis and face-edge finite element approximation |
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Authors: | I Perugia |
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Institution: | (1) Dipartimento di Matematica, Università di Pavia, Via Ferrata 1, I-27100 Pavia, Italy, Tel. +39-0382-505655, Fax +39-0382-505602; e-mail: perugia@dimat.unipv.it , IT |
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Abstract: | Summary. A mixed field-based variational formulation for the solution of threedimensional magnetostatic problems is presented and
analyzed. This method is based upon the minimization of a functional related to the error in the constitutive magnetic relationship,
while constraints represented by Maxwell's equations are imposed by means of Lagrange multipliers. In this way, both the magnetic
field and the magnetic induction field can be approximated by using the most appropriate family of vector finite elements,
and boundary conditions can be imposed in a natural way. Moreover, this method is more suitable than classical approaches
for the approximation of problems featuring strong discontinuities of the magnetic permeability, as is usually the case. A
finite element discretization involving face and edge elements is also proposed, performing stability analysis and giving error estimates.
Received January 23, 1998 / Revised version received July 23, 1998 / Published online September 24, 1999 |
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Keywords: | Mathematics Subject Classification (1991): 65N30 |
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