Abstract
We consider the flow of a viscous incompressible fluid through a rigid homogeneous porous medium. We propose a high-order discretisation based on Whitney finite elements, namely, Raviart-Thomas finite elements of degree r + 1 for the discharge and discontinuous piecewise polynomial finite elements of degree r for the pressure, with r ≥ 0. We comment on the use of new degrees of freedom that have a clear physical meaning, the so-called weights on the small simplices, for the involved discharge and pressure fields. We describe a new numerical strategy to solve the discrete problem based on a tree-cotree block-decomposition of the unknowns that is natural when considering these new degrees of freedom. Preliminary numerical tests in two dimensions confirm the stability of the adopted method and the effectiveness of the new degrees of freedom.
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Acknowledgements
The authors wish to dedicate this work to the memory of Christine Bernardi, research director at the CNRS. Numerical methods applied to Darcy’s model was one of her favorite subjects.
Funding
This research was supported by the program MathIT financed by the ANR-15-IDEX-01 of the Universite Côte Azur (UCA) in Nice, France. E. Zappon warmly thanks the Università degli Studi di Trento (Italy) for the possibility of studying as ERASMUS fellow at the Université Côte Azur, where this work began. The first author was partially supported by the project PRIN 201752HKH8.
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Alonso Rodríguez, A., Rapetti, F. & Zappon, E. New degrees of freedom for high-order Whitney approximations of Darcy’s flows. Numer Algor 87, 1613–1634 (2021). https://doi.org/10.1007/s11075-020-01022-4
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DOI: https://doi.org/10.1007/s11075-020-01022-4
Keywords
- Darcy equation
- Whitney finite elements
- High order
- New degrees of freedom
- Graph theory
- Exterior differential calculus