Simulation aux Grandes Echelles et chimie complexe pour la modélisation de la structure chimique des flammes turbulentes

Abstract : Large Eddy Simulation (LES) is applied to industrial burners to predict a wide range of complex physical phenomena, such as flame ignition and pollutants formation. The prediction accuracy is tightly linked to the ability to describe in detail the chemical reactions and thus the flame chemical structure. With the improvement of computational clusters, the simulation of industrial burners with detailed chemistry becomes possible. A major issue is then to couple detailed chemical mechanisms to turbulent flows. While the flame dynamics is often correctly simulated with stateof- the-art models, the prediction of complex phenomena such as pollutants formation remains a difficult task. Several investigations show that, in many models, the impact of flame subgrid scale wrinkling on the chemical flame structure is not accurately taken into account. Two models based on explicit flame front filtering are explored in this thesis to improve pollutants formation in turbulent premixed combustion: (i) a model based on deconvolution of filtered scalars; (ii) a model involving the optimization of chemistry to reproduce filtered turbulent flames. The objective of the work is to achieve high accuracy in pollutants formation prediction at low computational costs.
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Cédric Mehl. Simulation aux Grandes Echelles et chimie complexe pour la modélisation de la structure chimique des flammes turbulentes. Autre. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLC052⟩. ⟨tel-01873493⟩

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