INTERNAL COMBUSTION ENGINE

This research paper strategy was previously applied to simplified geometries as well as real engine
geometries. The purpose of this work is to show its validity for real and complex engine geometry, covering a longer
simulation interval then previously. After an initial description of the mesh creation process, studies of the incylinder charge motion, created during the intake stroke, were made to investigate the presence of a tumble motion.
The results how strong tumble motion is not generated. This could also be because of numerical diffusion caused by
the mesh structure. Furthermore, investigations were made to see why the present engine has a tendency to knock,
possible increasing the knock risk close to the exhaust valves. Problem calculated turbulence intensity that was too
low for proper flame propagation were apparent, leading to inconsistency between the calculated cylinder pressure of
the CFD calculation and the calibrated1D calculation.