Sensibilité en mécanique des fluides : adaptation de maillage, turbulence et optimisation.
|Abstract:||This thesis concerns the analysis of fluid mechanics by computer. The goal is to present new methodologies that allow controlling effectively and automatically parameters of the physical and numerical problem to obtain the results the engineer desires. These results are concrete needs as the performance of the system measured in terms of aerodynamic coefficients, energy losses, etc. To control the result, the flow simulation is not sufficient. The link between results and parameters is missing. A sensitivity analysis provides this information. If we do this analysis appropriately, its cost becomes marginal. First, the numerical estimate of the result must be reliable. Consequently, we give an new way to control effectively the error related to the spatial discretization necessary for this kind of computational methods. We use the sensitivity of the result with respect to the residuals of the physics equations. We are validating our new tools on laminar flows. Then we continue with turbulent flows. Once these quantities are well estimated numerically, the problem can be optimized virtually. Thus, the actual design improvement can be accelerated. In this work, geometric optimization is achieved. We present new ways to manage design constraints. We use the sensitivity of the result to wall perturbations.|
|Document Type:||Thèse de doctorat|
|Open Access Date:||15 February 2021|
|Collection:||Thèses et mémoires|
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