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Simulation of turbulent diffusion flames using large Eddy simulation and conditional moment closure

Thursday, 22 December, 2011 - 10:00
Campus: Brussels Humanities, Sciences & Engineering campus
D
2.01
Mahdi Zakyani Roudsari
phd defence

Large eddy simulation (LES) of turbulent reactive flows using conditional moment closure
(CMC) model is presented in this thesis. The ability of LES-CMC method to predict complex
turbulent flames is shown in this thesis. First a literature survey is presented of the previous
research on LES and CMC. Then the mathematical description of the LES and the CMC model
is demonstrated. In the following the numerical method implemented for solving the governing
equations is presented. Important objectives of this study are as follows.

1. Study the feasibility of LES-CMC approach
2. Investigation of the applicability of CMC models, which were originally developed for
the Reynolds averaged Navier-Stokes (RANS) method, for usage with LES
3. Applying different sub-grid scale models to study their effect on the prediction of the
turbulent flow field and the turbulence-chemistry interaction
4. Investigating the effect of CMC grid resolution on the accuracy of the predictions
5. Study the importance of chemical mechanisms on the predictions

Different diffusion flames have been studied in this work. The results obtained from the
simulations show that the LES-CMC method is fully capable of simulating and predicting such
complex turbulent flames.