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W. Holly, T. Lauer, P. Priesching, J. Schneider, R. Tatschl:
"Investigation of the flame propagation in a large gas engine with LES";
Talk: AVL Advanced Simulation Technologies International User Conference 2015, AVL Graz (invited); 2015-06-23 - 2015-06-25; in: "AVL AST User Conference 2015", (2015).

Due to the lean combustion concepts of modern gas engines, the combustion development is a highly complex process. Modern simulation techniques like CFD can support the developing process and therefore reduce the number of expensive hardware variations. In this paper, two different turbulence approaches are investigated and their ability to predict the flow field and the combustion of a large gas engines is evaluated. The advanced LES approach was able to predict the flame propagation very accurately and furthermore, the causes of cyclic variations were investigated. The second turbulence model is based on the RANS approach. Despite the lower computational effort, this approach is also able to predict the flow field in the cylinder as well as in the prechamber in good agreement with the LES.