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NASA NTRS · Conference Paper

Large Eddy Simulation of Aircraft Wake Vortices: Atmospheric Turbulence Effects

Published 2011-09-08 From Langley Research Center 4 authors
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Attribution

This is the abstract and citation. Full text lives at NASA NTRS — we link out rather than host. All credit to the authors and Langley Research Center.

Abstract

Verbatim from NASA NTRS. Not paraphrased, not summarized.

Crow 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.

Authors

  • Han, Jongil North Carolina State Univ.
  • Lin, Yuh-Lang North Carolina State Univ.
  • Arya, S. Pal North Carolina State Univ.
  • Kao, C.-T. North Carolina State Univ.

Citation: Han, Jongil, Lin, Yuh-Lang, Arya, S. Pal , et al. (2011). Large Eddy Simulation of Aircraft Wake Vortices: Atmospheric Turbulence Effects. Langley Research Center. NASA NTRS ID 19980073282. https://ntrs.nasa.gov/citations/19980073282 ↗