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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

MODELING OF TURBULENT PREMIXED FLAMES IN THE FLAMELET REGIME

V. Kalyana Chakravarthy
School of Aerospace Engineering Georgia Institute of Technology Atlanta, Georgia 30332-0150 U.S.A

Thomas M. Smith
Parallel Computational Sciences Department Sandia National Laboratory Albuqurque, NM 87185 U.S.A

Suresh Menon
School of Aerospace Engineering Georgia Institute of Technology Atlanta, Georgia 30332-0150 U.S.A

Abstract

Large eddy simulation (LES) models for flamelet combustion are analyzed by simulating premixed flames in turbulent stagnation zones. A LES approach based on subgrid implementation of the linear eddy model (LEM) is compared with a more conventional approach based on the estimation of the turbulent burning rate. The effects of subgrid turbulence are modeled within the subgrid domain in the LEM-LES approach and the advection (transport between LES cells) of scalars is modeled using a volume-of-fluid (VOF) Lagrangian front tracking scheme. The ability of the VOF scheme to track the flame as a thin front on the LES grid is demonstrated. The combined LEM-LES methodology is shown to be well suited for modeling premixed flamelet combustion. It is established here that local laminar propagation of the flamelets needs to be resolved in addition to the accurate estimation of the turbulent reaction rate. Some key differences between LES-LEM and the conventional approach(es) are also discussed.