&lt;title&gt;Measurements of aircraft wake vortices at Memphis International Airport with a cw CO&lt;formula&gt;&lt;inf&gt;&lt;roman&gt;2&lt;/roman&gt;&lt;/inf&gt;&lt;/formula&gt; coherent laser radar&lt;/title&gt;

Heinrichs, Richard; Dasey, Timothy J.; Matthews, Michael P.; Campbell, Scot E.; Freehart, Robert E.; Perras, G. H.; Salamitou, Philippe

doi:10.1117/12.241060

Cited by 5 publications

(2 citation statements)

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“…The success of AVOSS will require the prediction model to be able to integrate the effects of many different atmospheric variables such as turbulence intensity, crosswind, and stratification upon vortex motion and decay. The prediction model of AVOSS is called the AVOSS Predictor Algorithm (APA) 4,5,6 which is being tested and extensively verified with observational data collected during recent field deployments 7,8 . Validated numerical models also can be used to test how the APA behaves in extreme conditions, or can be used to provide guidance for additional development and accuracy.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of wake vortex behavior in turbulent domains with ambient stratification

Switzer

Proctor

2000

38th Aerospace Sciences Meeting and Exhibit

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A three-dimensional large eddy simulation model is used to investigate the sensitivity of ambient stratification with turbulence on the behavior of aircraft wake vortices. Modeled ambient turbulence levels range from very weak to moderate, and stratification levels range from strongly stable to unstable. The results of profound significance from this study are: 1) very little sensitivity between vortex linking time and the level of stratification, 2) the mean vortex separation remained nearly constant regardless of stratification and turbulence (at least prior to linking), 3) the wake vortices did not rise regardless of the level of stratification, and 4) for very strong stratification, the vortex stopped descending and quickly dissipated even before vortex linking could occur. These results are supported by experimental data and are contrary to conclusions from other numerical studies that assume laminar flow and/or relatively-low Reynolds numbers.

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Section: Introductionmentioning

confidence: 99%

Numerical study of wake vortex behavior in turbulent domains with ambient stratification

Switzer

Proctor

2000

38th Aerospace Sciences Meeting and Exhibit

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“…Continuous wave lidars have been in use for many years for research measurements of wake behavior, and the current MIT Lincoln Laboratory implementation 18 provides automated wake detection and active tracking, as well as near-real time production of wake motion and strength data files. The NASA pulsed lidar has been tested with the Lincoln CW system and ground wind line at the John F. Kennedy International Airport and provides wake data that compares favorably with those sensors.…”

Section: Wake Sensorsmentioning

confidence: 99%

NASA aircraft vortex spacing system development status

David

James

Donald

et al. 1999

37th Aerospace Sciences Meeting and Exhibit

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Wake vortex transport in proximity to the ground

Hamilton

Proctor²

19th DASC. 19th Digital Avionics Systems Conference. Proceedings (Cat. No.00CH37126)

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A sensitivity study for aircraft wake vortex transport has been conducted using a validated large eddy simulation (LES) model. The study assumes neutrally stratified and nonturbulent environments and includes the consequences of the ground. The numerical results show that the nondimensional lateral transport is primarily influenced by the magnitude of the ambient crosswind and is insensitive to aircraft type.In most of the simulations. the ground effect extends the lateral position of the downwind vortex about one initial vortex spacing (h,,) in the downstream direction. Further extension by as much as one h,, occurs when the downwind vortex remains "in ground effect" (ICE) for relatively long periods of time. Results also show that a layer-averaged ambient wind velocity can be used to bound the time for lateral transport of wake vortices to insure safe operations on a parallel runway.

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<title>Measurements of aircraft wake vortices at Memphis International Airport with a cw CO<formula><inf><roman>2</roman></inf></formula> coherent laser radar</title>

Cited by 5 publications

References 0 publications

Numerical study of wake vortex behavior in turbulent domains with ambient stratification

Numerical study of wake vortex behavior in turbulent domains with ambient stratification

NASA aircraft vortex spacing system development status

Wake vortex transport in proximity to the ground

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