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Large Eddy Simulation of Aircraft Wake Vortices: Atmospheric Turbulence EffectsCrow instability can develop in most atmospheric turbulence levels, however, the ring vortices may not form in extremely strong turbulence cases due to strong dissipation of the vortices. It appears that strong turbulence tends to accelerate the occurrences of Crow instability. The wavelength of the most unstable mode is estimated to be about 5b(sub 0), which is less than the theoretical value of 8.6b(sub 0) (Crow, 1970) and may be due to limited domain size and highly nonlinear turbulent flow characteristics. Three-dimensional turbulence can decay wake vortices more rapidly. Axial velocity may be developed by vertical distortion of a vortex pair due to Crow instability or large turbulent eddy motion. More experiments with various non-dimensional turbulence levels are necessary to get useful statistics of wake vortex behavior due to turbulence. Need to investigate larger turbulence length scale effects by enlarging domain size or using grid nesting.
Document ID
19980073282
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Han, Jongil
(North Carolina State Univ. Raleigh, NC United States)
Lin, Yuh-Lang
(North Carolina State Univ. Raleigh, NC United States)
Arya, S. Pal
(North Carolina State Univ. Raleigh, NC United States)
Kao, C.-T.
(North Carolina State Univ. Raleigh, NC United States)
Date Acquired
August 18, 2013
Publication Date
November 1, 1997
Publication Information
Publication: Proceedings of the NASA First Wake Vortex Dynamic Spacing Workshop
Subject Category
Aerodynamics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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