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The appliation of potential CFD methods to helicopter hover flowsFixed-wing code development is now aimed primarily at the solution of problems dominated by separation--based on the assumptions that the ability to solve such problems implies the ability to solve all other problems and that present inviscid method are already adequate for most other problems. Neither of the above assumptions are correct for rotary wing problems. This is because of the unique and overriding importance of wake modeling to rotor problems and also due to the well-known numerical diffusion problems which convectional Eulerian Computational fluid dynamics (CFD) method encounter when called on to convect strong vortical regions for long distances. The need for accurate wake analyses is probably the most fundamental difference between rotory and fixed-wing aerodynamics. In addition, rotary wing complexity requires a much more intimate relationship between test and analysis than is common in fixed-wing work. With these issues in mind, this paper will review some of our recent experience in using a unique-Eulerian-Lagrangian Computational fluid dynamics (CFC) method for the solution of a critical rotor-wake problem--the prediction of hover performance.
Document ID
19950062148
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Caradonna, F. X.
(NASA Ames Research Center Moffett Field, CA, US, United States)
Tung, C.
(NASA Ames Research Center Moffett Field, CA, US, United States)
Ramachandran, K.
(Flow Analysis, Inc. Moffett Field, CA, US, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publisher: The Univ. of Tennessee Space Inst. (SECTAM, Vol. 16)
ISBN: 1-879921-01-4
Subject Category
Aerodynamics
Accession Number
95A93747
Distribution Limits
Public
Copyright
Other

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