<p>Full-annulus Reynolds-averaged Navier–Stokes (RANS) simulations of intake–fan interactions in high bypass ratio turbofan engines require substantial computational resources, which limits their use in preliminary design and integration studies. To improve computational efficiency while retaining essential three-dimensional flow characteristics, a RANS-extracted body-force modeling approach is implemented in ANSYS CFX through secondary development. In this framework, rotor blade effects are represented by momentum and energy source terms introduced into the governing equations, replacing the geometric blade representation. The modeling procedure is first reconstructed and validated using NASA Rotor 67 under uniform inflow conditions. Performance maps at multiple rotational speeds are compared with full-passage RANS results, demonstrating that the body-force model reproduces the total pressure ratio and total temperature ratio with acceptable engineering accuracy. Radial distributions on the meridional plane further confirm that key spanwise flow features are preserved. Based on the validated reconstruction, the extracted force-distribution structure is adapted to develop a body-force model for a high bypass ratio turbofan fan using available characteristic parameters without detailed blade geometry. A similarity-based radial distribution strategy is employed, where normalized spanwise distributions derived from Rotor 67 are scaled according to the target fan performance. The reconstructed model reproduces design-point characteristics accurately. The results demonstrate the adaptability of the RANS-extracted body-force framework across different fan configurations, providing a practical modeling approach for geometrically unknown engineering scenarios.</p>