Effects of Free-Stream Turbulence on Wing-Tip Vortex Formation and Near Field

2006 ◽  
Vol 43 (5) ◽  
pp. 1282-1291 ◽  
Author(s):  
S. C. C. Bailey ◽  
S. Tavoularis ◽  
B. H. K. Lee
Keyword(s):  
Free Stream ◽  
Near Field ◽  
Vortex Formation ◽  
Tip Vortex ◽  
Free Stream Turbulence ◽  
Wing Tip Vortex ◽  
Wing Tip

Measurements of the velocity field of a wing-tip vortex, wandering in grid turbulence

2008 ◽  
Vol 601 ◽  
pp. 281-315 ◽  
Author(s):  
S. C. C. BAILEY ◽  
S. TAVOULARIS
Keyword(s):  
Free Stream ◽  
Tip Vortex ◽  
Grid Turbulence ◽  
Velocity Measurements ◽  
Free Stream Turbulence ◽  
Normal Probability ◽  
Rate Of Decay ◽  
Wing Tip Vortex ◽  
Point Velocity ◽  
Wing Tip

Velocity measurements were performed in a wing-tip vortex wandering in free-stream turbulence using two four-wire hot-wire probes. Vortex wandering was well represented by a bi-normal probability density with increasing free-stream turbulence resulting in increased amplitude of wandering. The most dominant wavelength of wandering was found to remain unaffected by free-stream conditions. Two-point velocity measurements were used to reconstruct the vortex velocity profile in a frame of reference wandering with the vortex. Increasing turbulence intensity was found to increase the rate of decay of the vortex peak circumferential velocity while the radial location of this peak velocity remained unchanged. These results are consistent with several possible vortex decay mechanisms, including the stripping of vorticity by azimuthally aligned vortical structures, transfer of angular momentum from the vortex to these structures during their formation and the deformation and breakup of the vortex by strong free-stream eddies.

Free-stream turbulence interaction with a wing-tip vortex

2020 ◽  
Vol 206 ◽  
pp. 104211
Author(s):  
Kamal Ben Miloud ◽  
Marouen Dghim ◽  
Hachimi Fellouah ◽  
Mohsen Ferchichi
Keyword(s):  
Free Stream ◽  
Tip Vortex ◽  
Free Stream Turbulence ◽  
Wing Tip Vortex ◽  
Wing Tip

scholarly journals Numerical and experimental investigation of the mean and turbulent characteristics of a wing-tip vortex in the near field

2014 ◽  
Vol 228 (13) ◽  
pp. 2516-2529 ◽  
Author(s):  
Micheál S O’Regan ◽  
Philip C Griffin ◽  
Trevor M Young
Keyword(s):  
Reynolds Stress ◽  
Turbulence Model ◽  
Near Field ◽  
Tip Vortex ◽  
Mean Flow ◽  
Turbulent Characteristics ◽  
The Mean ◽  
Wing Tip Vortex ◽  
Wing Tip ◽  
Good Agreement

The near-field (up to three chord lengths) development of a wing-tip vortex is investigated both numerically and experimentally. The research was conducted in a medium speed wind tunnel on a NACA 0012 square tip half-wing at a Reynolds number of 3.2 × 105. A full Reynolds stress turbulence model with a hybrid unstructured grid was used to compute the wing-tip vortex in the near field while an x-wire anemometer and five-hole probe recorded the experimental results. The mean flow of the computed vortex was in good agreement with experiment as the circulation parameter was within 6% of the experimental value at x/ c = 0 for α = 10° and the crossflow velocity magnitude was within 1% of the experimental value at x/ c = 1 for α = 5°. The trajectory of the computed vortex was also in good agreement as it had moved inboard by the same amount (10% chord) as the experimental vortex at the last measurement location. The axial velocity excess is under predicted for α = 10°, whereas the velocity deficit is in relatively good agreement for α = 5°. The computed Reynolds shear stress component 〈 u′v′〉 is in good agreement with experiment at x/ c = 0 for α = 5°, but is greatly under predicted further downstream and at all locations for α = 10°. It is thought that a lack of local grid refinement in the vortex core and deficiencies in the Reynolds stress turbulence model may have led to errors in the mean flow and turbulence results respectively.

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