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Crucial specifications of an engine are spread widely in various subsystems, such as cooling system, intake and exhaust system, combustion system, etc. Well-informed design decision and optimized design solution cannot be reached without considering interactions among subsystems. Even though significant progresses on CAE technologies have been made to address physical and chemical phenomena in each subsystem, there are few studies in literature to model an engine with a reasonable coverage of subsystems in an integrated fashion. The necessity of such approach is justified from two aspects. Firstly, modifications in one subsystem could result in changes in other subsystems. Secondly, frequently due to experimental constraints or availability of prototypes which is the case for new engine design, boundary conditions for a subsystem of interest can only be obtained from integrated numerical simulations with other subsystems.