Abstract
CFD/CSD coupled simulations are presented for a Bell M427 main rotor in both forward and maneuvering flight. The unstructured CFD code UNCLE is coupled with the CSD code DYMORE2.0 to perform rotor aeroelastic analysis. Two CFD/CSD coupling strategies are evaluated and demonstrated: loose coupling for rotors in a steady level forward flight and tight coupling for rotors undergoing a maneuver. A Fluid-Structure Interface (FSI) handles the information exchange and directs operation of the CFD and CSD codes required to perform tight coupling analysis. The loose coupling results are assessed with the forward flight test data, and the tight coupling method is verified by comparing to the results obtained with the loose coupling method in forward flight where fixed control settings are used. For a maneuvering flight, user-prescribed control variations drive the collective pitch angle to a ±2 doublet profile superimposed on the loose coupling control settings. The coupled simulations demonstrate the feasibility of performing aeromechanical analysis for realistic helicopter rotors.
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