Growing environmental concerns mandate ever more stringent fuel economy and emission regulations to the automotive industry, which require synergy of advanced in-cylinder combustion and aftertreatment. Therefore, it is important to develop new strategies such as direct injection lean burn combustion in order to dras-tically reduce in-cylinder pollutant formation and fuel consumption. To achieve this goal more effectively, it is necessary to develop a more comprehensive mathematical model to accurately predict combustion and emissions in order to complement experimental efforts to develop next-generation internal combustion (IC) engines.The main objective of the present study is to develop a high-fidelity turbulent com-bustion model for modern direct injection compression ignition (DICI) engines with a wide variety of injection strategies. Among many existing turbulent combustion models, the flamelet approach and its derivatives has been successfully applied to many types of IC engine simulations