Analysis of the Diving Turn Maneuver for the UH-60A Rotor

A Hybrid Navier-Stokes Free-Wake Computational Fluid Dynamics (CFD) methodology, coupled with a multi-body dynamics analysis code, has been applied to study the aeromechanical loads developed over the UH-60A rotor experiencing a severe diving turn maneuver, 11680. The feasibility of a quasi-steady loosely coupled approach for predicting severe maneuver loads was explored for efficiently and accurately predicting critical aerodynamic and aeroelastic phenomena. Time histories of sectional normal loads and pitching moments, blade structural loads, and pitch-link loads for a rotor revolution characterized by peak load factor have been examined in detail. The prediction of advancing blade stall phenomena unique to severe maneuvers is explored using aerodynamic and structural refinements to the model.