Towards Multi-Cycle Simulation of In-Cylinder Flow and Combustion (English shop)

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This dissertation investigates the numerical simulation of turbulent in-cylinder flow and combustion processes in internal combustion engines, with particular emphasis on cycle-to-cycle variations and their influence on combustion stability.

The research focuses on developing a hybrid two-scale turbulence model that combines Reynolds-Averaged Navier-Stokes (RANS) modelling with Large Eddy Simulation (LES). This approach aims to capture transient turbulent structures while reducing the computational demands associated with conventional LES methods.

The study further explores the coupling of the hybrid turbulence model with the G-equation approach for premixed combustion. Numerical investigations include homogeneous isotropic turbulence, simplified engine configurations, multi-cycle engine simulations and turbulent flame propagation under high-swirl conditions.

By examining the interaction between turbulent flow structures, combustion modelling and numerical simulation techniques, the dissertation contributes to the development of computational methods for analysing cyclic variations and improving the understanding of combustion processes in internal combustion engines.