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Formulation éléments finis variationnelle adaptative et calcul massivement parallèle pour l’aérothermique industrielle

Abstract : By 2030, considering the progress of HPC, aerospace manufacturers like Safran Aircraft Engines (SAE), hope to be able to simulate a whole aircraft engine, at full scale, using Computational Fluid Dynamic (CFD). The goal of this PhD thesis is to bring a scientific contribution to this research framework. Indeed, the present work is devoted to the development of a variational adaptive finite element method allowing to improve the aerothermal simulations related to the turbine blade cooling. More precisely, our goal is to develop a new multiscale mesh adaptation technique, well suited to the resolution of highly convective heat transfers in turbulent flows. To do so, we propose a hierarchical control of errors based on recently developed subscales VMS error estimators. The first contribution of this work is then to propose a new isotropic mesh adaptation technique based on the previous error estimates. The second contribution is to combine both (i) the coarse scales interpolation error indicator and (ii) the subscales error estimator for anisotropic mesh adaptation. The results on analytic 2D and 3D benchmarks show that the proposed multiscale mesh adaptation technique allows obtaining highly precise solutions with much less elements in comparison with other mesh adaptation techniques. Finally, we propose in this thesis a description of the parallel software capabilities of Cimlib-CFD. Then, we present the two hardware systems used during this PhD thesis. The first one is the lab's cluster allowing the development of numerical methods. The second one however, is the GENCI Occigen II supercomputer which allows producing numerical results using massively parallel computations. In particular, we present a more realistic industrial concerning the cooling of a complete turbine vane composed by 39 holes.
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https://pastel.archives-ouvertes.fr/tel-02420374
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Submitted on : Thursday, December 19, 2019 - 6:36:08 PM
Last modification on : Monday, April 6, 2020 - 6:06:19 PM
Document(s) archivé(s) le : Friday, March 20, 2020 - 10:09:38 PM

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  • HAL Id : tel-02420374, version 1

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Alban Bazile. Formulation éléments finis variationnelle adaptative et calcul massivement parallèle pour l’aérothermique industrielle. Mécanique des fluides [physics.class-ph]. PSL Research University, 2019. Français. ⟨NNT : 2019PSLEM008⟩. ⟨tel-02420374⟩

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