Abstract
We propose a finite volume method on general meshes for the discretization of Richards equation, an elliptic—parabolic equation modeling groundwater flow. The diffusion term, which can be anisotropic and heterogeneous, is discretized in a gradient scheme framework, which can be applied to a wide range of unstructured possibly non-matching polyhedral meshes in arbitrary space dimension. More precisely, we implement the SUSHI scheme which is also locally conservative. As is needed for Richards equation, the time discretization is fully implicit. We obtain a convergence result based upon energy-type estimates and the application of the Fréchet-Kolmogorov compactness theorem. We implement the scheme and present the results of a number of numerical tests.
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Acknowledgments
D. Hilhorst and H.C. Vu Do acknowledge the support of the ITN Marie Curie Project FIRST and of the Fondation Jacques Hadamard
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Brenner, K., Hilhorst, D., Vu Do, H.C. (2014). A Gradient Scheme for the Discretization of Richards Equation. In: Fuhrmann, J., Ohlberger, M., Rohde, C. (eds) Finite Volumes for Complex Applications VII-Elliptic, Parabolic and Hyperbolic Problems. Springer Proceedings in Mathematics & Statistics, vol 78. Springer, Cham. https://doi.org/10.1007/978-3-319-05591-6_53
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DOI: https://doi.org/10.1007/978-3-319-05591-6_53
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