• LES
• bluff-body burner
• Smagorinsky
• Ksgs
• HeaRT

In the present work, a bluff-body burner is simulated at two different conditions: a non-reactive and a reactive one. The geometry implemented is suitable for a CFD study: it has some of the complications associated with practical combustors and it is characterized by a strong interaction between turbulence and chemistry. LES numerical simulations were performed at the ENEA (Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile)-Casaccia Research Center by means of the in-house code HeaRT (Heat Release and Turbulence) using parallel computers available at the ENEA computational grid CRESCO (Computational RESearch on COmplex system).
In the non-reactive case, two simulations of two different turbulent subgrid scale models were performed: the Dynamic Smagorinsky model and the Transported SGS Kinetic energy (Ksgs) non-dynamic model. In fact, since it is non reactive, this case is the easiest way to study the different effects of these models.
The reactive case simulation, instead, is characterized by a non-premixed flame of CH_4/H_2 and air and it is simulated using only the ksgs non-dynamic turbulent subgrid model and the fast chemistry approach for the combustion closure.
The results of these simulations are compared to the experimental data carried out at the Sandia National Laboratory (temperature and chemical species measurements) and at the University of Sydney (speed and rms measurements both in reactive and non reactive case) using non intrusive optical technique.