NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
An Assessment of CFD/CSD Prediction State-of-the-Art by Using the HART II International Workshop DataOver the past decade, there have been significant advancements in the accuracy of rotor aeroelastic simulations with the application of computational fluid dynamics methods coupled with computational structural dynamics codes (CFD/CSD). The HART II International Workshop database, which includes descent operating conditions with strong blade-vortex interactions (BVI), provides a unique opportunity to assess the ability of CFD/CSD to capture these physics. In addition to a baseline case with BVI, two additional cases with 3/rev higher harmonic blade root pitch control (HHC) are available for comparison. The collaboration during the workshop permits assessment of structured, unstructured, and hybrid overset CFD/CSD methods from across the globe on the dynamics, aerodynamics, and wake structure. Evaluation of the plethora of CFD/CSD methods indicate that the most important numerical variables associated with most accurately capturing BVI are a two-equation or detached eddy simulation (DES)-based turbulence model and a sufficiently small time step. An appropriate trade-off between grid fidelity and spatial accuracy schemes also appears to be pertinent for capturing BVI on the advancing rotor disk. Overall, the CFD/CSD methods generally fall within the same accuracy; cost-effective hybrid Navier-Stokes/Lagrangian wake methods provide accuracies within 50% the full CFD/CSD methods for most parameters of interest, except for those highly influenced by torsion. The importance of modeling the fuselage is observed, and other computational requirements are discussed.
Document ID
20120009891
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Smith, Marilyn J.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Lim, Joon W.
(Army Aviation Systems Command Moffett Field, CA, United States)
vanderWall, Berend G.
(Deutsche Forschungsanstalt fuer Luft- und Raumfahrt Brunswick, Germany)
Baeder, James D.
(Maryland Univ. College Park, MD, United States)
Biedron, Robert T.
(NASA Langley Research Center Hampton, VA, United States)
Boyd, D. Douglas, Jr.
(NASA Langley Research Center Hampton, VA, United States)
Jayaraman, Buvana
(Science and Technology Corp. Albuquerque, NM, United States)
Jung, Sung N.
(Konkuk Univ. Seoul, Korea, Republic of)
Min, Byung-Young
(Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
August 25, 2013
Publication Date
May 1, 2012
Subject Category
Aerodynamics
Report/Patent Number
Paper No. 349
NF1676L-13580
Meeting Information
Meeting: American Helicopter Society 68th Annual Forum and Technology Display
Location: Forth Worth, TX
Country: United States
Start Date: May 1, 2012
End Date: May 3, 2012
Funding Number(s)
WBS: WBS 877868.02.07.07.03.01.02
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available