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Time-Spectral Method for CFD Prediction of Helicopter Rotor Vibratory Loads

Summary: Time-Spectral Method for CFD Prediction of
Helicopter Rotor Vibratory Loads
Seongim Choi1
and Anubhav Datta2
Dept. of Aeronautics and Astronautics, Stanford University, Stanford, CA,
94305 sichoi@stanford.edu
Eloret Corporation, NASA Ames Research Center, Moffett field, CA, 94035
Summary. A Fourier collocation based time-spectral method is used to simulate
helicopter rotor flows under high-speed transonic and highly-loaded dynamic stall
conditions. Computations are performed using fully coupled CFD/Comprehensive
Analysis, where the Comprehensive Analysis supplies finite element CSD and aircraft
trim capabilities. The focus is on the prediction of vibratory airloads of an isolated
rotor. The accuracy of spectral method is compared with a time-accurate analysis,
both trimmed consistently to the same flight condition. Two UH-60A flights are
simulated Counters 8534 and 9017 from the U. S. Army/NASA Airloads Program
a high vibration flight and a deep dynamic stall flight. For the high vibration
flight, the fastest and minimal implementation of the method, with 11 time instances


Source: Alonso, Juan J. - Department of Aeronautics and Astronautics, Stanford University


Collections: Engineering