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Méthode intégrale pour la couche limite tridimensionnelle - Applications au givrage

Abstract : Icing has since long been identified as a serious issue in the aeronautical world. Ice accretion occurs when supercooled water droplets impinge on a surface, particularly the leading edge of a wing or an engine inlet, and freeze after the impingement. This can lead to degradation of aerodynamic performances, sensor malfunction or engine damage. This is why this issue is being carefully studied. The lengthy and costly flight and wind tunnel tests have made numerical simulation of ice accretion a necessary tool in the aircraft design and certification process. The present work deals with the 3D numerical modeling of ice accretion, and more particularly the modeling of the dynamic and thermal boundary layers that develop around an iced body. Since numerical tools must be fast and robust, the approach proposed in this thesis for aerodynamic computation is a coupled Euler/integral boundary layer method. Thus, an integral model is developed to represent the development of the dynamic boundary layer. The thermal part is modeled either by a simplified method based on algebraic approaches, or by an integral method. This modeling of the dynamic and thermal boundary layers is valid on smooth or rough walls and provides the friction coefficient and heat exchange coefficient that are necessary for the calculation of ice accretion. The integral boundary layer equations, associated with their closure relations, are then solved by a Finite-Volume method on unstructured surface mesh, that is well suited for complex geometries. In addition, specific numerical treatments are implemented to improve the accuracy of the method in the vicinity of the stagnation point and to make the code robust to separated boundary layers. After validation of the boundary layer method, the code is used in ONERA’s 2D and 3D icing tools for icing applications. This demonstrates the value of the method in terms of robustness and accuracy compared to the boundary layer codes more commonly used in current icing tools.
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Submitted on : Friday, February 23, 2018 - 11:07:42 AM
Last modification on : Tuesday, March 26, 2019 - 2:28:03 PM
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Charlotte Bayeux. Méthode intégrale pour la couche limite tridimensionnelle - Applications au givrage. Mécanique des fluides [physics.class-ph]. INSTITUT SUPERIEUR DE L'AERONAUTIQUE ET DE L'ESPACE (ISAE); UNIVERSITE DE TOULOUSE, 2017. Français. ⟨tel-01715950⟩



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