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Modélisation microphysique tridimentionnelle des dépôts de givre

Abstract : The purpose of this thesis consists in the understanding of the icing phenomenon overcoming during clouds by aircrafts supercooled water contamination. Under specific conditions (aerothermic and geometry), ice shape is strongly discontinuous and has the scallop shape. This icing mechanism is multi physics. It requires efficient numerical tools and it has to be adapted to obtain solution. Experimentation lead by NASA on NACA and by ONERA on cylinder allowed of the understanding of the macroscopic scallop ice. These studies are observed, analysed in order to suggest a microphysical model. This study showed that geometry influenced directly on the scallop ice formation because of its links with the friction lines which modify water's runback. Moreover, the impingement of supercooled droplets by using Lagrangian approach required colossal time calculation. In order to optimize it, many microphysics approaches are proposed. It consists in making by a qualitative way, the convective exchange variation in the roughened ice on the cylinder. Theses simulations lead to result, in the spite of the qualitative study, is very encouraging for future simulations. Indeed, discontinuities are visible and are similar to scallop ice accretion observed experimentally.
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Submitted on : Tuesday, August 21, 2012 - 10:17:38 AM
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Xuan Presteau. Modélisation microphysique tridimentionnelle des dépôts de givre. Physique Atmosphérique et Océanique [physics.ao-ph]. Université Blaise Pascal - Clermont-Ferrand II, 2009. Français. ⟨tel-00724453⟩

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