Modélisation numérique multiphysiques couplés - Application à un projectile supersonique

Abstract : The constant search for improved modeling complex multi-physics is now a key issue and be able to propose such an approach is a necessity in both a need for detailed analysis and performance improvement systems and studied. For example, suggest new generation missile systems force us to control both external aerodynamics and heat transfer associated while incorporating flight dynamics and possible changes in geometry associated with heat stress. Tackle such a coupled system is the primary motivation of this work. However, solving systems strongly coupled if necessary to propose a strategy in the modeling approach. The technique has been immersed boundaries retained and integrated into a compressible solver based on an automatic mesh generator structure 2nTree. Before even addressing the ablation mechanisms, work is particularly focused on the characterization of external flows around projectiles, academic initially to quickly converge SOCBT projectiles and ammunition arrows flying very high speeds. Quality results and excellent correlation with literature results have encouraged us to continue the development by coupling with a flight dynamics model of 6 ° of freedom and taking into account the heating of the projectile to take account in flight conditions (in particular the stability of the projectile). Heat flow may also cause thermal degradation and the proposed model allows taking into account phenomena ablation. Although the modeling is simplistic at first, the proposed model was able to describe fairly easy problem to moving boundary as a mechanism of ablation. Calculations have highlighted the interesting behavior of the numerical model on academic cases and fins features a round arrow. Calculation coupled fluid mechanics / heat projectile / ablation demonstrates the potential of the proposed model as well.
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Submitted on : Monday, December 17, 2012 - 1:52:00 PM
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Van Thuan Luu. Modélisation numérique multiphysiques couplés - Application à un projectile supersonique. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2012. Français. ⟨NNT : 2012ESMA0015⟩. ⟨tel-00766003⟩

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