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We investigate the mixing process of exhaust gases with fresh air in Internal CombustionEngines (ICE). For this purpose, the flow in an inlet manifold of a six-cylinderheavy-duty Diesel engine is computed using compressible Large Eddy Simulations (LES). TheExhaust Gas Recirculation (EGR) concentration is modeled as a passive scalar. The resultsare validated by on-engine measurements of the EGR concentration using COZ probes. Theboundary conditions for the highly pulsating flow are taken partly from one-dimensionalsimulations, partly from pressure measurements on the engine. In order to assess thesensitivity to the boundary conditions, changes are applied to the base-line case. Themixing quality is evaluated in terms of cylinder-to-cylinder distribution and the spatialRMS over the outlet cross- sections. Different averaging techniques are applied. It wasfound that the temporal and spatial EGR distribution is different among the cylinders. TheEGR distribution within the cylinder inlet is non-uniform. These factors imply that oneshould not use a time-averaged EGR value as indicator for the EGR content. Furthermore, itwas found that the flow pulsations at the EGR inlet have a large influence on the EGRdistribution. By comparing the LES results with measurements, it was shown that LES givesa better and deeper insight into the mixing in such turbulent, pulsating flowsituations

Modeling of EGR Mixing in an Engine Intake Manifold Using LES