DNS simulations of lean premixed flame kernels with flamelet generated manifolds; an overview

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Abstract

In this paper recent developments in the application of themethod of flamelet generated manifolds (FGM) to simulations of turbulentpremixed combustion are considered. Initially the method was developed forkinetic reduction for simulations of laminar combustion using stationarysolvers. Recently the method was extended to direct numerical simulationsof turbulent combustion. A lean premixed flame kernel was taken for a numberof studies, investigating the application of the FGM technique. To that endthe laminar mass burning rate was assessed in the context of the influenceof stretch. Also a theoretical stretch model was involved in this test. Itwas found that the theoretical stretch was reproduced even up to the thinreaction zones regime. Validation also includes backsubstitution of stretchedflamelets from the DNS into a detailed chemistry code. In two-dimensionalcases a direct validation is performed with detailed chemistry for both unityLewis numbers and physical Lewis numbers. Finally a flamelet theory of stretcheffects in subgrid scales is evaluated from the DNS.
Original languageEnglish
Title of host publicationProceedings European Conference on Computational Fluid Dynamics (ECCOMAS CFD 2006, Egmond aan Zee, The Netherlands, September 5-8, 2006)
EditorsP. Wesseling, E. Oñate, J. Périaux
Place of PublicationDelft
PublisherTechnische Universiteit Delft
Pages1-22
ISBN (Print)90-9020970-0
Publication statusPublished - 2006

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