Abstract
We prove a substructuring result for variational inequalities. It concerns but is not restricted to the Richards equation in heterogeneous soil, and it includes boundary conditions of Signorini’s type. This generalizes existing results for the linear case and leads to interface conditions known from linear variational equalities: continuity of Dirichlet and flux values in a weak sense. In case of the Richards equation, these are the continuity of the physical pressure and of the water flux, which is hydrologically reasonable. We use these interface conditions in a heterogeneous problem with piecewise constant soil parameters, which we address by the Robin method. We prove that, for a certain time discretization, the homogeneous problems in the subdomains including Robin and Signorini-type boundary conditions can be solved by convex minimization. As a consequence, we are able to apply monotone multigrid in the discrete setting as an efficient and robust solver for the local problems. Numerical results demonstrate the applicability of our approach.
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Communicated by Gabriel Wittum.
This work was supported by the BMBF–Förderprogramm “Mathematik für Innovationen in Industrie und Dienstleistungen”.
An erratum to this article can be found at http://dx.doi.org/10.1007/s00791-012-0173-0
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Berninger, H., Sander, O. Substructuring of a Signorini-type problem and Robin’s method for the Richards equation in heterogeneous soil. Comput. Visual Sci. 13, 187–205 (2010). https://doi.org/10.1007/s00791-010-0141-5
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DOI: https://doi.org/10.1007/s00791-010-0141-5
Keywords
- Domain decomposition methods
- Saturated-unsaturated porous media flow
- Convex minimization
- Monotone multigrid