Problèmes à interface mobile pour la dégradation de matériaux et la croissance de biofilms : analyse numérique et modélisation

Antoine Zurek 1, 2
Abstract : This thesis deals with the numerical and mathematical study of models with free boundaries coming from physics and biology. Inn the first part, we consider a model which describes the carbonnation phenomena in reinforced concrete. The model involves a system of 1D-parabolic equation of reaction diffusion type defined on a domain with a moving boundary. The motion of this interface is governed by an ordinary differential equation and it increases asymptotically as the square root of t for large times. We first introduce a Finite Volume numerical scheme for the model with implicit/explicit time discretization and we prove its convergence. Next, we build a fully implicit scheme for which we are able to establish the behavior in square root of t of the interface in this discrete setting. In a second part, we study a cross-diffusion system modeling the expansion of some biofilms. We introduce a numerical scheme of Finite Volumes type which preserves the gradient flow structure of the model. We establish the existence of solutions to the scheme and its convergence towards a solution to the original model. Eventually, we consider a toy model derived from a more complete model called DPCM (Diffusion-Poisson-Coupled-Model). The later describes the corrosion of (nuclear waste) containers made of iron and stored in clay soil. Again the model involves a free boundary whose position is part of the unknowns. Using tools from Optimal Transport Theory and Calculus of Variations, we establish the existence of a solution to the model. This is a first step towards the study of DPCM for which no such result is available.
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Antoine Zurek. Problèmes à interface mobile pour la dégradation de matériaux et la croissance de biofilms : analyse numérique et modélisation. Analyse numérique [math.NA]. Université de Lille, 2019. Français. ⟨tel-02397231⟩

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