This paper presents the development of a tool integrated in the UNS3D code, proprietary of Alenia Aermacchi, for the simulation\nof external aerodynamic flow in a rotating reference frame, with the main objective of predicting propeller-aircraft integration\neffects. The equations in a rotating frame of reference have been formulated in terms of the absolute velocity components; in this\nway, the artificial dissipation needed for convergence is lessened, as the Coriolis source term is only introduced in the momentum\nequation. An Explicit Algebraic Reynolds Stress turbulence model is used. The first assessment of effectiveness of this method is\nmade computing stability derivatives of a NACA 0012 airfoil. Finally, steady Navier-Stokes and Euler simulations of a four-blade\nsingle-rotating propeller are presented, demonstrating the efficiency of the chosen approach in terms of computational cost.
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