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A mixed discretization of elliptic problems on polyhedra using anisotropic hybrid meshes

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Abstract

A virtual element method is introduced for the mixed approximation of a simple model problem for the Laplace operator on a polyhedron. The method is fully analysed when the meshes are made up of triangular right prisms, pyramids and tetrahedra. The local discrete spaces coincide with the lowest order Raviart–Thomas spaces on tetrahedral and triangular right prismatic elements, and extend them to pyramidal elements. The discrete scheme is well posed and optimal interpolation error estimates are proved on meshes which allow for anisotropic elements. In particular, local interpolation error estimates for the discrete element space are optimal and anisotropic on anisotropic right prisms. Furthermore, a discretization of the model problem in the presence of edge and vertex singularities is analysed for the proposed method on a family of suitably designed graded meshes, and optimal estimates for the approximation error are obtained, extending in this way the results of Farhloul et al. (ESAIM Math Model Numer Anal 35:907–920, 2001) where cylindrical domains with edge singularities were considered.

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Acknowledgements

This research has been supported by CONICET-Argentina under Grant PID 14420140100027CO, by Agencia Nacional de Promoción Científica y Tecnológica under Grant PICT 2014–1771, and by Universidad de Buenos Aires under Grant UBACyT 20020120100050.

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Authors and Affiliations

  1. Departamento de Matemática, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón I, Ciudad Universitaria, 1428, Buenos Aires, Argentina

    Alexis B. Jawtuschenko

  2. Departamento de Matemática, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario, Av. Pellegrini 250, 2000, Rosario, Argentina

    Ariel L. Lombardi

  3. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), CCT Rosario, Argentina

    Ariel L. Lombardi

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  1. Alexis B. Jawtuschenko
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  2. Ariel L. Lombardi
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Correspondence to Ariel L. Lombardi.

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Jawtuschenko, A.B., Lombardi, A.L. A mixed discretization of elliptic problems on polyhedra using anisotropic hybrid meshes. Calcolo 56, 10 (2019). https://doi.org/10.1007/s10092-019-0303-x

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