The purpose of this study is to develop and verify the newly developed solver for analyzing rotor flow field using the open-source CFD code. For helicopter fuselage aerodynamic evaluations an actuator disc model is sufficient unless a transient solution is sought that requires the modeling of the passage of the blades and associated tip vortices. In the present study, a rotor analysis solver has the formal algorithm of SIMPLE in simpleFoam, and the individual procedure for considering rotor influence. The flow chart of rotor analysis solver algorithm. The flow field around complex rotor-fuselage configurations can be modeled as a simple single block grid with unstructured meshes. For the calculation of the rotor thrust, the virtual blade method based on the blade element theory is employed. The inflow velocities on the rotor disk used to specify the effective angles of attack, have been included in the solver. The time-averaged mean flow of the unsteady rotor in forward flight is calculated by modeling the rotor as an actuator disk in which source term is added in the momentum equation. The ROBIN configuration is designed for the experimental study of rotor-fuselage interactional aerodynamics and inflow analysis. The time-averaged inflow velocity is normalized by the rotor tip rotational speed and compared with the experimental data at four azimuthal positions for the rotor-fuselage configuration with or without the fuselage at the test conditions. For hovering validation, caradonna"s and ballard’s experiments were employed. The validation cases in forward and hovering flight were computed and good agreement with the experiment is obtained. It is demonstrated that the present method for estimation of rotor influence and OpenFOAM for numerical fluid analysis could a useful tool to predict the complicated rotor-fuselage interactional aerodynamic phenomena and to estimate inflow on rotor disk in an efficient time-averaged manner.