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Stratégie de résolution hybride structurée / non structurée pour la simulation d'effets technologiques en turbomachines

Abstract : The aerospace engine manufacturers wish to rely on the most accurate description of their propulsion systems in order to continuously improve their performance levels. Therefore, numerical models must include as much as possible geometrical details likely to impact the physics of the flow under study. Taking into account such technological effects turns out to be a difficult task when working with available structured solvers. A hybrid strategy takes advantage of structured and unstructured zones within the same computational domain in order to efficiently describe technological effects. Geometrically complex local details are easily accounted for thanks to the flexibility of unstructured grid generation while keeping structured zones in the remainder of the flow domain allows to benefit from the tried and tested structured solver efficiency. The present work contributes to the development of such a hybrid strategy in ONERA elsA solver and enhances accuracy and robustness with respect to the solver initially developed to establish the feasibility and interest of hybridization. Following a review of the space discretization techniques available in the initial solver, several improvements (least square techniques, quasi-Green approach, computation of face gradients) have been analysed, then implemented and validated for academic test-cases. The choice of a hybrid strategy with coincident matching between structured and unstructured zones leads to highly deformed cells in the structured / unstructured interface region, requiring the development of supplementary robustness improvement techniques (physics- or geometry-based limiters). The hybrid solver gathering these various options allows to successfully compute isolated blade geometries including technological effects such as blade fillet, cooling holes, trailing edge cutbacks, internal coolant supply channel. Finally, a structured / unstructured strategy has been proposed and applied to the hybrid simulation of a rotor/stator interaction for the steady and unsteady
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  • HAL Id : tel-02628491, version 1

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STAR | UGA | CNRS

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Matthieu Soismier. Stratégie de résolution hybride structurée / non structurée pour la simulation d'effets technologiques en turbomachines. Génie mécanique [physics.class-ph]. Université Grenoble Alpes, 2016. Français. ⟨NNT : 2016GREAI113⟩. ⟨tel-02628491⟩

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