Niveau: Supérieur, Doctorat, Bac+8
Conference on Turbulence and Interactions TI2006, May 29 - June 2, 2006, Porquerolles, France LARGE EDDY SIMULATIONS OF TURBULENT COMBUSTION D. Veynante Laboratoire E.M2.C. CNRS et Ecole Centrale Paris, 92295 Châtenay-Malabry, France Email: ABSTRACT In large eddy simulation (LES), the larger turbulent motions in a flow field are explicitly computed when only the effects of the small ones are modelled. This approach is very well adapted to turbulent reacting flows which are generally dominated by such structures, especially when combustion instabilities occur. The instantaneous location of cold and burnt gases are then identified at the resolved scale level. As they may have very different characteristics in terms of turbulence, pollutant emissions or radiative heat transfers, this identification is expected to allow a better description of the flame / turbulence interactions. Nevertheless, models are still required to describe small scale effects and this approach is computationally expensive. To compare numerical results with experimental data is also a challenge. Despite of these difficulties, very impressive results have already been achieved using LES in complex configurations. INTRODUCTION Large eddy simulation (LES), where the larger turbulent motions in a o w eld are explicitly computed whereas only the effects of the small ones are modelled, has now reach a high level of maturity for non reacting o ws [1–4].
- dynamic models
- turbulent structure
- features - models required - reduced modeling
- prohibitive numerical
- premixed ame
- predict unresolved
- ame