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

Switzer, George; Proctor, Fred H.

doi:10.2514/6.2000-755

Cited by 25 publications

(20 citation statements)

References 20 publications

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“…37 The turbulence kinetic energy dissipation rate is estimated by fitting Kolmogorov's theoretical spectrum in the inertial subrange to the simulated spectra.…”

Section: Turbulence Initializationmentioning

confidence: 99%

Interaction of Aircraft Wakes From Laterally Spaced Aircraft

Proctor¹

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Large Eddy Simulations are used to examine wake interactions from aircraft on closely spaced parallel paths. Two sets of experiments are conducted, with the first set examining wake interactions out of ground effect (OGE) and the second set for in ground effect (IGE). The initial wake field for each aircraft represents a rolled-up wake vortex pair generated by a B-747. Parametric sets include wake interactions from aircraft pairs with lateral separations of 400, 500, 600, and 750 ft. The simulation of a wake from a single aircraft is used as baseline. The study shows that wake vortices from either a pair or a formation of B-747's that fly with very close lateral spacing, last longer than those from an isolated B-747. For OGE, the inner vortices between the pair of aircraft, ascend, link and quickly dissipate, leaving the outer vortices to decay and descend slowly. For the IGE scenario, the inner vortices ascend and last longer, while the outer vortices decay from ground interaction at a rate similar to that expected from an isolated aircraft. Both OGE and IGE scenarios produce longer-lasting wakes for aircraft with separations less than 600 ft. The results are significant because concepts to increase airport capacity have been proposed that assume either aircraft formations and/or aircraft pairs landing on very closely spaced runways.

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“…37 The turbulence kinetic energy dissipation rate is estimated by fitting Kolmogorov's theoretical spectrum in the inertial subrange to the simulated spectra.…”

Section: Turbulence Initializationmentioning

confidence: 99%

Interaction of Aircraft Wakes From Laterally Spaced Aircraft

Proctor¹

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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“…Specifications for the domain and grid size are shown in Table 2. The width and height of the domain is larger than in our earlier studies, 14,15 in order to minimize boundary influences during the ring-vortex phase of evolution. Prior to vortex initialization, an initial field of resolved-scale turbulence is allowed to develop under an artificial external forcing at low wavenumbers.…”

Section: Initial Conditionsmentioning

confidence: 99%

“…The matrix of 29 cases for this study has been considerably broadened from those performed in Switzer and Proctor 14 and which were used in the development of TDAWP. …”

Section: Initial Conditionsmentioning

confidence: 99%

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Three-Phased Wake Vortex Decay

Proctor

Ahmad

Switzer

et al. 2010

AIAA Atmospheric and Space Environments Conference

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A detailed parametric study is conducted that examines vortex decay within turbulent and stratified atmospheres. The study uses a large eddy simulation model to simulate the out-of-ground effect behavior of wake vortices due to their interaction with atmospheric turbulence and thermal stratification. This paper presents results from a parametric investigation and suggests improvements for existing fast-time wake prediction models. This paper also describes a three-phased decay for wake vortices. The third phase is characterized by a relatively slow rate of circulation decay, and is associated with the ringvortex stage that occurs following vortex linking. The three-phased decay is most prevalent for wakes imbedded within environments having low-turbulence and near-neutral stratification. Nomenclature

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“…The formulation is driven by parametric studies from LES using TASS 30,31 . Unlike the previously described OGE models, the TDAWP formulation also includes the effects of crosswind shear on vortex descent rate, thus allowing the prediction of vortex tilt and the change in lateral separation due to crosswind.…”

Section: Candidate Modelsmentioning

confidence: 99%

Evaluation of Fast-Time Wake Vortex Prediction Models

Proctor

Hamilton²

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Current fast-time wake models are reviewed and three basic types are defined. Predictions from several of the fast-time models are compared. Previous statistical evaluations of the APA-Sarpkaya and D2P fast-time models are discussed. Root Mean Square errors between fast-time model predictions and Lidar wake measurements are examined for a 24 hr period at Denver International Airport. Shortcomings in current methodology for evaluating wake errors are also discussed.

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

Cited by 25 publications

References 20 publications

Interaction of Aircraft Wakes From Laterally Spaced Aircraft

Interaction of Aircraft Wakes From Laterally Spaced Aircraft

Three-Phased Wake Vortex Decay

Evaluation of Fast-Time Wake Vortex Prediction Models

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