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Proposing Institution

German Aerospace Center (DLR), Institute of Combustion Technology
Project Manager

Priv. Doz. Dr.-Ing. Peter Gerlinger
Pfaffenwaldring 38-40
70569 Stuttgart
The present project is a first step towards the development of a hybrid Large-Eddy Simulation (LES)/Filtered Density Function (FDF) method for the computation of soot in turbulent combustion. A generic validation test case, i.e. a lifted, turbulent, sooting ethylene-air jet flame at a Reynolds-number of 10,000 will be investigated by two different modeling approaches. The first oneis a large-eddy simulation with finite-rate chemistry (FRC). Soot is modelled by a sectional approach, which is detailed enough to accurately predict soot particle size distributions and efficient enough to be applicable to LES of turbulent flames. In the proposed large-eddy simulations, subgrid-scale turbulence chemistry interaction (TCI) will be modeled by a multi-variate assumed probability density function (PDF) approach. In order to provide a more accurate closure for TCI, a transported-PDF (TPDF) method will be applied as a second modeling approach.At present, the TPDF method is coupled to RANS (Reynolds Averaged Navier Stokes) turbulence models. The objective of this proposal is to validate LES and TPDF separately for the simulation of sooting flames before proceeding further towards the development of a hybrid LES/FDF method for soot predictions.

Impressum, Conny Wendler