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25th AIAA Applied Aerodynamics Conference June 2528, 2007/Miami, FL

Summary: 25th AIAA Applied Aerodynamics Conference
June 25­28, 2007/Miami, FL
Validation Study of Aerodynamic Analysis Tools for
Design Optimization of Helicopter Rotors
Seongim Choi
, Juan J. Alonso
, Edwin v.d. Weide
Stanford University, Stanford, CA 94305
Jaina Sitaraman§
National Institute of Aerospace, Hampton, , VA 23666
The key objectives of this paper are to assess the accuracy and the validity of our current
aerodynamic analysis tools in predicting the unsteady flow field generated by helicopter
rotors and to investigate their applicability to the future design problems. A Reynolds-
Averaged Naiver-Stokes (RANS) solver with various turbulence models has been used
with necessary modifications for the computation of all test cases. Dynamic stall and
massive separation, which are physical phenomena characteristic of helicopter flows, are
analyzed first using RANS methodology, and Detached Eddy Simulation (DES) is applied
to the simulation of massive separation and compared to corresponding RANS solutions.
The periodic nature of the helicopter flowfield strongly motivates the application of Time-
Spectral (TS) approach for unsteady RANS computations. In this paper, the TS method


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


Collections: Engineering