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Multi-field variational formulations and mixed finite element approximations for electrostatics and magnetostatics

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Abstract

In this paper we propose different multi-field variational formulations for electrostatics and magnetostatics, which can provide optimal discrete approximation of any particular vector field. The proposed formulations are constructed by appealing to mechanics point of view amenable to using general constitutive equations, which is quite different from electrostatics and magnetostatics formulations typical of physics and electrical engineering focusing on the corresponding global form suitable only for linear case. In particular, the formulations we propose can be combined with mixed discrete approximations that can ensure the continuity of tangential component of electric or magnetic field and normal component of electric displacement and magnetic flux even for low order interpolations. The choice of this kind is quite different from currently favorite choice of high order finite element interpolations used for coupling electromagnetism with mechanics. The discrete approximation is based upon Whitney’s interpolations representing the vector fields in terms of corresponding differential forms, with electric and magnetic fields as one-form and electric displacement and magnetic flux as two-form. The implementation of interpolations of this kind is made for 3D tetrahedron elements with non-standard approximation parameters defined not only at vertices (for zero-form), but at edges (for one-form) and at facets (for two-form). The results of several numerical simulations are presented to illustrate the performance of different formulations proposed herein.

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Acknowledgements

This work was supported jointly by Haut-de-France Region (CR Picardie) (120-2015-RDISTRUCT-000010 and RDISTRUCT-000010) and EU funding (FEDER) for Chaire-de-Mécanique (120-2015-RDISTRUCTF-000010 and RDISTRUCTI-000004). AI was also supported by IUF.

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Authors and Affiliations

  1. Université de Technologie Compiègne – Sorbonne Universités, Laboratoire Roberval de Mécanique, Compiègne, France

    Pablo Moreno-Navarro, Adnan Ibrahimbegovic & Alejandro Ospina

  2. Chaire de Mécanique UTC & IUF-Institut Universitaire de France, Paris, France

    Adnan Ibrahimbegovic

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  1. Pablo Moreno-Navarro
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  2. Adnan Ibrahimbegovic
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  3. Alejandro Ospina
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Correspondence to Adnan Ibrahimbegovic.

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Moreno-Navarro, P., Ibrahimbegovic, A. & Ospina, A. Multi-field variational formulations and mixed finite element approximations for electrostatics and magnetostatics. Comput Mech 65, 41–59 (2020). https://doi.org/10.1007/s00466-019-01751-x

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