Hybrid discretization methods for Signorini contact and Bingham flow problems.

Abstract : This thesis is concerned with the devising and the analysis of hybrid discretization methods for nonlinear variational inequalities arising in computational mechanics. Salient advantages of such methods are local conservation at the cell level, robustness in different regimes and the possibility to use polygonal/polyhedral meshes with hanging nodes, which is very attractive in the context of mesh adaptation. Hybrid discretization methods are based on discrete unknowns attached to the mesh faces. Discrete unknowns attached to the mesh cells are also used, but they can be eliminated locally by static condensation. Two main applications of hybrid discretization methods are addressed in this thesis. The first one is the treatment using Nitsche’s method of Signorini’s contact problem (in the scalar-valued case) with a nonlinearity in the boundary conditions. We prove optimal error estimates leading to energy-error convergence rates of order (k + 1) if face polynomials of degree k ≥ 0 are used. The second main application is on viscoplastic yield flows. We devise a discrete augmented Lagrangian method applied to the present hybrid discretization. We exploit the capability of hybrid methods to use polygonal meshes with hanging nodes to perform local mesh adaptation and better capture the yield surface. The accuracy and performance of the present schemes are assessed on bi-dimensional test cases including comparisons with the literature.
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Karol Cascavita. Hybrid discretization methods for Signorini contact and Bingham flow problems.. Numerical Analysis [math.NA]. Université paris Est, 2018. English. ⟨tel-02072493⟩

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