High Fidelity Multidisciplinary Tool Development for Helicopter Quieting
Final rept. 1 Oct 2004-30 Nov 2006
TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
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Flows over helicopter blades are very complex turbulent flows. The blades experience dramatically different flow field at various azimuthal angles. Also, a rotor normally consists of many elastic blades, with a strong coupling between aerodynamics and structure. The problem is indeed multidisciplinary. Current helicopter blade designers use computational models, which depend heavily on experimental data and cannot be used to predict any novel design, which is a significant departure from existing designs. To simulate this multiscale and multidisciplinary physics with confidence, we have developed a robust multidisciplinary computational tool called WINDUS-HELI based on the WIND-US code by coupling CFD with CSD, adopting state-of-the-art numerical approaches, and applying high fidelity physics models. Very reasonable results have been obtained for both the aerodynamic loadsperformance and acoustics predictions for all the validation cases studied. In summary, the WIND-US based helicopter rotor code coupled with RCAS and WOPWOP-PSU has been developed. The UH60A calculations are in good agreement with experimental data. The high-order spectral difference code demonstrates its potential for capturing the rotor wake. Additional validation of codes for dynamic stall and blade-vortex interaction are still required.