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Proposing Institution

Institut für numerische Methoden in der Luft- und Raumfahrttechnik, Universität der Bundeswehr München
Project Manager

Prof. Dr.-Ing. Markus Klein
Werner-Heisenberg-Weg 39
85577 Neubiberg
Turbulent premixed combustion is a complex process to model due to the strong interaction of turbulence and chemistry and due to the very thin flame fronts. Depending on the turbulent Reynolds number the resolution of turbulent length scales can also be an issue. For this reason direct numerical simulations (DNS) of the governing equations are not feasible for configurations of engineering interest. Large eddy simulation is considered a promising tool because only the small scale structures need to be modelled, whereas the large, energy containing structuresare resolved on the computational grid. In spark ignition engines and industrial gas turbine combustors combustion takes places at elevated pressures. However, most of the combustion LES models are derived for atmospheric pressures. The goal of the project is to establish a DNS database of turbulent premixed Bunsen flames. This database will consist of simplified chemistry based simulations (with suitably adjusted Arrhenius parameters) which allows to go for large scale separation and beside that detailed chemistry based simulations. These are limited to smaller ratio of turbulent length scale to flame thickness but instead provide more detailed insides fore example into effects of differential diffusion.Main focus of this (test account) project is to perform a scaling analysis for this newly developed code in order to understand its parallel performance with the detailed chemistry features. The earlier code version demonstrated linear parallel performance up to at least 30.000 processors. At a later stage the data will be used for FSD based model development of turbulent premixed combustion in the context of LES.

Impressum, Conny Wendler