Large eddy simulations (LES) of of engine combustion

SNIC 2019/3-181


SNIC Medium Compute

Principal Investigator:

Michael Oevermann


Chalmers tekniska högskola

Start Date:


End Date:


Primary Classification:

20306: Fluid Mechanics and Acoustics



There is an immense pressure from the legislation authorities on the automotive industry to improve internal combustion engines in terms of efficiency and emissions. Even with the transition to hybrid and electrically driven vehicles the internal combustion engine will remain present for many decades to come. In particular for heavy duty (truck) vehicles, ships and aircraft engines there is no real alternative to combustion driven propulsion systems in sight. To further improve a quite mature technology such as internal combustion engines, sophisticated numerical simulations techniques and models are of utmost importance. The development and improvement of such models is the research focus of the modeling activities in the Division of Combustion and Propulsion Systems within the Department of Mechanics and Maritime Sciences at Chalmers. Over the past years we have been developing in several projects new LES based simulation models for all relevant physical and chemical aspects of engine combustion. This includes detailed simulations of cavitating flows in liquid fuel injectors (both diesel and gasoline), simulation of spray atomization processes and turbulent combustion in complex moving geometries. LES simulations are expected to replace in the near future RANS (Reynolds Averaged Navier-Stokes) simulations in industry as they provide a much deeper insight into the flow physics. However, LES simulations are quite demanding in terms of compute resources and for realistic applications they require simulations on high performance parallel computers as provided by SNAC. The resource will be jointly used by all PhD students and seniors in our division (Combustion and Propulsion Systems) doing CFD simulations of engine combustion processes. The focus of our research activities nowadays are large eddy simulations (LES) of combustion processes in engines with the aim to improve engine emissions and efficiency.