Multidisciplinary CFD/CSD Analysis of the Smart Active Flap Rotor

To address the complex multidisciplinary nature of rotorcraft analysis, high-fidelity computational fluid and structural dynamics models have been developed and coupled for an advanced technology active rotor. Significant advancements have been made in both modeling disciplines to allow for complex bearingless flapped rotors. Comparisons are made between CFD/CSD and comprehensive (lifting-line, free-wake) analyses and experimental data for the Boeing SMART rotor. Flap phase sweeps for 0, 2, 3, 4, and 5/rev flap inputs are investigated in relation to the zero flap deflection baseline at a nominal cruise condition. Changes in performance, aerodynamic and structural loads, control power, and noise are studied. Details of the high-fidelity flowfield solution, including flap gap effects and wake visualizations, are also presented.