CAM colloquium - Friday, March 3
3:30 p.m.
655 Rhodes Hall

Speaker: Anne Bourlioux, University of Montreal

 

Title: An asymptotic view on flamelet models for turbulent combustion

Abstract: At large scales, turbulent flames can be viewed as the effective solutions of a system of nonlinear PDEs, the reactive Navier-Stokes equations. Constructing such solution is especially challenging for the reactive cases because it requires averaging over the nonlinearities associated with reaction in addition to the usual ones associated with transport. In many applications, reaction is very fast compared to the other time scales in the flow, and this is exploited in the so-called flamelet strategies. I will present an overview of such approaches in the context of idealized models. Those results generalize to the reactive cases the theory developed for turbulent diffusion by Majda and collaborators. A combination of asymptotic analysis (mostly homogenization) and numerical simulations is used to study examples from turbulent premixed and non-premixed flames. Hierarchy of models corresponding to increasingly accurate asymptotic approximations will be presented. How to select automatically the appropriate model at the computation proceeds is a topic of current research.

 

Refreshments at 4:30 in 657 Rhodes Hall.