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Étude et amélioration des méthodologies de couplage aérothermique fluide-structure

Abstract : This work deals with the solution of coupled aerothermal problems. The aim of the work is to improve the accuracy and robustness of the coupling techniques. The stability of the aerothermal coupling for steady state problems is first studied (weak coupling). A numerical Biot number is defined, which allows to evaluate the intensity of the fluid-structure thermal interaction. Several methods (Dirichlet-Robin, Neumann-Robin and Robin-Robin) are studied and their ranges of validity are defined. The Dirichlet-Robin method with a safety coefficient, which presents the easiest implementation, proves to be the most robust. Taking radiation into account implies a major destabilization of the aerothermal problem. Thus, the stabilization method is modified in order to be able to stabilize this type of calculation. In the second part, the solution of coupled aerothermal problems in the transient regime is studied using the quasidynamic partitioned algorithm. This is an iterative procedure (strong coupling) between the thermal problem in the solid solved in the transient regime and the flow field at the steady state, thus ensuring equal heat flux and temperature at each coupling time. The accuracy of this algorithm is analysed and improved. Finally, the quasi-dynamic algorithm is analysed on quasi-industrial aerothermal problems of aeronautical compressor and turbine discs.
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Submitted on : Friday, November 6, 2020 - 2:26:35 PM
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Rocco Moretti. Étude et amélioration des méthodologies de couplage aérothermique fluide-structure. Sciences de l'ingénieur [physics]. UNIVERSITE PSL PARIS, 2019. Français. ⟨tel-02992558v1⟩

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