The aim of this article is to show the importance of unsteady characterization to understand the complex physics of turbulence - chemistry interaction resulting in flame pulsation, extinction and reignition. Some experimental measurements performed on premixed flames in our laboratory hide much information and numerical simulation can help in understanding it. In this context, LES (Large Eddy Simulation) can be useful, providing multi-scale information and capturing the dynamics of turbulent combusting flows. LES explicitly computes the largest structures of the flow and models only the effects of the small ones by means of SGS (Sub-Grid Scale) models; the one used in the present simulations is the Fractal Model, FM. Two different flames are simulated; in one of them, acoustics is neglected assuming the Artificial Compressibility Method, in the other one, fully compressible, reactive, Navier-Stokes equations are solved. The latter approach increases the computational time but allows to resolve the high frequencies typical of chemical reactions and to capture pressure - heat release coupling responsible for thermo-acoustic instabilities. The solutions were obtained using parallel computing to reduce computational time. Details about boundary conditions, numerical schemes, chemistry and molecular properties calculation are given.
|Publication status||Published - 2004|
|Event||European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS 2004 - , Finland|
Duration: 1 Jan 2004 → …
|Conference||European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS 2004|
|Period||1/1/04 → …|
All Science Journal Classification (ASJC) codes
- Artificial Intelligence
- Applied Mathematics
Giacomazzi, E., Favini, B., Brunch, C., Picchia, F. R., & Arcidiacono, N. (2004). Turbulent flames dynamics and their numerical simulation. Paper presented at European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS 2004, Finland.