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Modélisation numérique de l'interaction d'un écoulement de fluide viscoplastique avec un obstacle rigide par la méthode SPH : Application aux laves torrentielles

Abstract : In this work, we study the impact of a transient free-surface flow of viscoplastic fluid on a rigid obstacle. This study is conducted numerically using the SPH (Smoothed Particle Hydrodynamics) method, and the Herschel-Bulkley rheological model. The SPH code is adapted to our needs and validated on classic benchmarks. The local characteristics of the flow near the obstacle are analysed and two impact regimes are highlighted depending on the slope angle. By studying of the pressure exerted on the obstacle, both spatially and temporally, with regards to these impact regimes, we evidence the respective roles of the gravitational and kinetic components of the pressure. Our results are systematically compared with experimental data from a previous work and are shown to be consistent. A comparative study conducted on both our viscoplastic flows and flows of granular material of similar properties highlights common characteristics of the two materials.
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Mathieu Labbé. Modélisation numérique de l'interaction d'un écoulement de fluide viscoplastique avec un obstacle rigide par la méthode SPH : Application aux laves torrentielles. Sciences de la Terre. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAU001⟩. ⟨tel-01147458⟩

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