CFD simulation of GDI engine cold start

CFD simulation of cold start under extremely low ambient temperature in the internal combustion engine is very challenging due to both low evaporation and complicated evaporation processes of fuel. The objective of this study was to develop a computational tool to model evaporation processes of a wide range of multi-component fuels in the gasoline engines realistically and accurately. Particular interest was in GDI engine start operation under extremely cold conditions.

Modeling of in-cylinder flow using overset mesh

Overset mesh has gained popularity in modeling applications with complicated geometries due to its flexibility in handling arbitrary motion. This paper presents a study on application of overset mesh for in-cylinder flow using STAR-CCM+®. Different mesh strategies were investigated including trim, poly, and direct mesh. It was found that the results are similar from different mesh while ploy mesh overall produces more robust results than trim mesh.

Evaluation of the flame propagation in an engine

Evaluation of the flame propagation in an engine simulated with the ECFM combustion model