Flamelet Modeling in Large-eddy Simulation of Turbulent Premixed<br/>Flames

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Flamelet Modeling in Large-eddy Simulation of Turbulent Premixed
Flames

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 51985 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Farshchi, Mohammad; Salehi, Mohammad Mahdi
Abstract:
The purpose of this study is to investigate the efficiency of a flamelet method along with the LES1 approach in the modeling of a turbulent premixed flame behind the bluff-body. In this flame ,because of the high turbulence intensity and fuel dilution, there is a significant interaction between the turbulence and chemical kinetics. In this study, first, the cold flow is modeled using LES and RANS2 approaches. Then, using the Flame-Generated Manifold (FGM) model and a presumed PDF model, the turbulent reacting flow is simulated.Comparison of the results of the LES and RANS showed that the accuracy of the LES method in simulating the physics of turbulent flow is much higher than RANS, but its computational cost is also higher. Therefore, the combination of the LES approach and the FGM method can be very effective in simulating the interaction between turbulence and combustion
Keywords:
Flamelet Model ; Large Eddy Simulation (LES) ; Premixed Flame ; Combustion Modeling

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