A three-dimensional turbofan inlet/fan cowl analysis system based on computational fluid dynamics (CFD) has been developed. This system was established to aid nacelle designers in the efficient assessment of their design concepts by providing for immediate evaluation of design changes without extensive reliance on wind tunnel testing. A reliable CFD flow solver, user-friendly grid generator, and postprocessing software are included in the system. The system is easy to use by designers who are not particularly familiar with CFD. Validation and applicability studies have been performed using several different inlet/fan cowl configurations at on-design and off-design engine operating conditions. This work demonstrates that an Euler-based CFD code integrated with automatic grid generation and postprocessing can reduce the development cycle time in the inlet/fan cowl design process.