Computational simulations are conducted for elastic single and coaxial helicopter rotor configurations using high- and low-fidelity methods. Loose coupling approach is used to model the fluid-structure interaction for elastic blades. Computational predictions are compared with the experimental measurements of rotor performance and unsteady vibratory loads. The study demonstrated excellent correlation between the computational predictions and the experimental measurements of steady performance whereas the magnitude of vibratory hubloads showed significant differences. The lower fidelity predictions for steady performance of coaxial rotor were within 5% for the steady performance computed by the high fidelity methods. The peak to peak magnitude of the unsteady hubloads for the lower rotor was comparable for the two computational methods, however, the lower fidelity method did not capture the high frequency content in the hub loads.
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