Large-eddy simulation in turbulent combustion

Description

Turbulent flow and combustion are each complex phenomena. Combining these two fields needs a high grade of modeling. In order to obtain a moderate modeling error for the turbulence problem, a large-eddy simulation (LES) is used. Unlike statistical turbulence models the large-eddy simulation retains the time dependence and the three-dimensionality of the flow. This leads to a good description and a reliable prediction of the turbulent flow but also increases the computational cost. To compensate the additional expense, efficient numerical methods have to be applied and high computing power is needed. In the first step the turbulence has been considered and a new LES model has been developed. In the next step we want to analyze how the improvements of the turbulence model can be exploited for the combustion model. The goal is to solve the transport equations independent from the modeling of turbulence and combustion. That means the modeling only takes part in the so called subgrid of the LES. The numerical scheme is based upon the Method of Transport from M. Fey which first have to be extended to three dimensions and the use of viscous flows.

Contacts

Prof. Rolf Jeltsch and Jochen Maurer (maurer@sam.math.ethz.ch ).