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In this work, combustion and pollutant formation phenomena in a direct injection Diesel engine are studied using n-Dodecane as fuel. The initial part of work is to validate the results from three dimensional computational fluid dynamics (CFD) with the engine experimental data. Various state-of-the-art models for simulating the droplet spray, impingement, collision, boiling and combustion are employed with the full kinetic mechanism. Extended coherent flame model for three zones predicts the averaged in-cylinder pressure data within 5 % of the experimental readings. CO, CO2, UBHC and NOx are found to be within the error limits between the CFD and experimental results. The CFD study is further extended towards the addition of little EGR for achieving lower NOx emissions and partial injection of fuel in the intake stroke followed by main injection. To facilitate the easy evaporation and mixing of fuel, preheated air is introduced.