Schmidt, H. and Oevermann, M. and Bastiaans, R.J.M. and Kerstein, A.R.
(2009)
*A priori Tabulation of Turbulent Flame Speeds via a Combination of a Stochastic Mixing Model and Flamelet Generated Manifolds, Extended to Incorporate Strain Effects.*
ZIB Report, 09-09
.
ISSN 1438-0064

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Official URL: http://opus.kobv.de/zib/frontdoor.php?source_opus=...

## Abstract

In this paper we revisit the a priori turbulent flame speed tabulation (TFST) technique for a given parameter space within the region of flamelet combustion-regimes. It can be used as a subgrid-scale (SGS) model in Large Eddy Simulation (LES). In a first step, stationary laminar flamelets are computed and stored over the progress variable following the ideas of flamelet generated manifolds (FGM). In a second step, the incompressible one-dimensional Navier-Stokes equations supplemented by the equation for the progress variable are solved on a grid that resolves all turbulent scales. Additionally, turbulent transport is implemented via the linear eddy model (LEM). The turbulent flame structures are solved until a statistically stationary mean value of the turbulent flame speed has been reached. The results are stored in a table that could be used by large scale premixed combustion models, e.g. front tracking schemes. First results are compared quantitatively with direct numerical simulations (DNS) taken from literature. Then it is illustrated in one example how the new method could help to fix constants in algebraic models for turbulent flame speeds. Further it is shown how the technique can be extended to incorporate turbulent strain effects. Finally we investigate the effect of the use of detailed and tabulated chemistry under unsteady conditions.

Item Type: | Article |
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Uncontrolled Keywords: | Turbulente Verbrennung, Flammenstrukturen, Linear Eddy Model, FGM, Turbulente Brenngeschwindigkeit, Streckungseffekte, turbulent premixed combustion, flame structures, linear eddy model, flamelet generated manifolds, turbulent flame speed tabulation, strain effects |

Subjects: | Mathematical and Computer Sciences > Mathematics > Applied Mathematics |

Divisions: | Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group |

ID Code: | 752 |

Deposited By: | Ulrike Eickers |

Deposited On: | 14 Aug 2009 10:17 |

Last Modified: | 14 Aug 2009 11:11 |

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