Adaptation of a dynamic wrinkling model to an engine configuration
Résumé
The dynamic model proposed by Charlette et al. represents an interesting alternative to the FSD balance
equation to predict the transient growth of a flame kernel. The dynamic wrinkling model coupled to the
algebraic Flame Surface Density (FSD) model of Boger et al. is here evaluated for the first time in an internal
combustion engine configuration. Preliminary tests enable to evidence practical difficulties when applying
the model to this type of complex configuration. Improvements are proposed to adapt the model to the
engine configuration. Final simulations are performed on a spark ignition engine configuration, using both
the adapted dynamic model and an equilibrium wrinkling formulation. The results are compared to the ones
obtained by Robert et al. on the same configuration using the ECFM-LES model solving a FSD balance
equation. The dynamic model proves to very well predict out-of-equilibrium values and to account for cycle-
to-cycle variabilities, as the model parameter is calculated on the fly. On the contrary, the results obtained
using the equilibrium formulation clearly demonstrate that the flame-turbulence equilibrium assumption is
not adapted to such configurations.