Ultra high by-pass ratio (UHBR) turbofan with short inlets and boundary layer ingesting (BLI) configurations are promising concepts to address the issue of aircraft fuel burn reduction. Prediction of turbofan inlet aerodynamics has thus become a key design step for it influences both external and internal aircraft components. This paper reviews CFD methodologies to accurately predict nacelle aerodynamics in presence of a fan located downstream of the inlet. The study deals with a modern turbofan with high bypass ratio. Experimental data serve as reference to compare two different fan modeling methods. An actuator disc model and a body-force formulation are tested to assess their ability to reproduce fan effects on inlet aerodynamics. Evaluations are made in cross-wind configurations. Results show that the body-force modeling method accurately predicts inlet separation and reproduce air intake aerodynamics and such with far less computational effort (and does so by approximately two orders) than the 360◦ unsteady RANS reference. Although the presented actuator disc model reproduces well fan aerodynamics in clean flow conditions, it fails to reproduce inlet-fan coupling effects.