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Unsteady Flame Embedding

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Turbulent Combustion Modeling

Part of the book series: Fluid Mechanics and Its Applications ((FMIA,volume 95))

Abstract

Direct simulation of all the length and time scales relevant to practical combustion processes is computationally prohibitive. When combustion processes are driven by reaction and transport phenomena occurring at the unresolved scales of a numerical simulation, one must introduce a dynamic subgrid model that accounts for the multiscale nature of the problem using information available on a resolvable grid. Here, we discuss a model that captures unsteady flow-flame interactions—including extinction, re-ignition, and history effects—via embedded simulations at the subgrid level. The model efficiently accounts for subgrid flame structure and incorporates detailed chemistry and transport, allowing more accurate prediction of the stretch effect and the heat release. In this chapter we first review the work done in the past thirty years to develop the flame embedding concept. Next we present a formulation for the same concept that is compatible with Large Eddy Simulation in the flamelet regimes. The unsteady flame embedding approach (UFE) treats the flame as an ensemble of locally one-dimensional flames, similar to the flamelet approach. However, a set of elemental one-dimensional flames is used to describe the turbulent flame structure directly at the subgrid level. The calculations employ a one-dimensional unsteady flame model that incorporates unsteady strain rate, curvature, and mixture boundary conditions imposed by the resolved scales. The model is used for closure of the subgrid terms in the context of large eddy simulation. Direct numerical simulation (DNS) data from a flame-vortex interaction problem is used for comparison.

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Authors and Affiliations

  1. Massachusetts Institute of Technolog, Cambridge, MA, 02139, USA

    Hossam A. El-Asrag

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  1. Hossam A. El-Asrag
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  2. Ahmed F. Ghoniem
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Correspondence to Hossam A. El-Asrag .

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Editors and Affiliations

  1. Dept. Mechanical & Aerospace Engineering, North Carlolina State University, Stinson Drive 2601, Raleigh, 27695, North Carolina, USA

    Tarek Echekki

  2. Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, United Kingdom

    Epaminondas Mastorakos

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El-Asrag, H.A., Ghoniem, A.F. (2011). Unsteady Flame Embedding. In: Echekki, T., Mastorakos, E. (eds) Turbulent Combustion Modeling. Fluid Mechanics and Its Applications, vol 95. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0412-1_12

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