Aircraft Vortices in Stably Stratified and Weakly Turbulent Atmospheres: Simulation and Modeling

Visscher, Ivan De; Bricteux, Laurent; Winckelmans, Grégoire

doi:10.2514/1.j051742

Cited by 50 publications

(48 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the vortices undergo complex interactions with the ground. Substantial effort has been made in the past to understand the governing physics of vortex dynamics [2][3][4][5][6][7][8] and to develop wakevortex prediction models [9][10][11][12][13][14][15][16][17] to enhance the capacity of the airspace while maintaining the safety.…”

mentioning

confidence: 99%

Multimodel Ensemble Methods for Prediction of Wake-Vortex Transport and Decay

Körner

Ahmad

Holzäpfel

et al. 2017

Journal of Aircraft

View full text Add to dashboard Cite

Several multimodel ensemble methods are selected and further developed to improve the deterministic and probabilistic prediction skills of individual wake-vortex transport and decay models. The different multimodel ensemble methods are introduced, and their suitability for wake applications is demonstrated. The selected methods include direct ensemble averaging, Bayesian model averaging, and Monte Carlo simulation. The different methodologies are evaluated employing data from wake-vortex field measurement campaigns conducted in the United States and Germany.= forecast of ith model g i yjf i = probability density function of forecast L = likelihood PB = probability that B occurs PBjA = probability that B occurs, given that A occurs py = probability density function of the y forecast

show abstract

mentioning

confidence: 99%

Multimodel Ensemble Methods for Prediction of Wake-Vortex Transport and Decay

Körner

Ahmad

Holzäpfel

et al. 2017

Journal of Aircraft

View full text Add to dashboard Cite

show abstract

“…Later on, the vortices are observed to link and form rings only in weak turbulence cases, whereas in moderate to strong turbulence, instabilities of shorter wavelength develop and prevent the vortices from linking. It was further observed that, in weak turbulence, the instability growth rate increases only for cases with weak to moderate stratification [13]. For higher stratification levels, the vortices are destroyed before the deformation becomes significant.…”

mentioning

confidence: 91%

“…In case of higher stratification (N 0.75), clear vortex rings that can be represented by the analytical shape model of Eq. (3) could not be identified because they are almost immediately destroyed after vortex linking [13].…”

Section: Tuning Of the Vortex Simulation Modelmentioning

confidence: 99%

“…Those simulations were performed at Université Catholique de Louvain in a study that focused on the influence of the atmospheric conditions (turbulence and stratification) on the longwave Crow-type instability development [13]. For that purpose, LESs of wake vortices at very high Reynolds number were performed with various turbulence and stratification levels.…”

Section: B Integration Of Velocity Fields From Large-eddy Simulationmentioning

confidence: 99%

“…Vortex deformation has been investigated in detail during flight tests [5,6], experimentally [7,8] and by numerical simulation [9][10][11][12]. Recently, De Visscher et al [13] used large-eddy simulations (LESs) to study the influence of combined atmospheric turbulence and stratification on the wake-vortex evolution (transport, decay, and topology). It was verified that atmospheric turbulence triggers the Crow instability.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Simulation Methods for Aircraft Encounters with Deformed Wake Vortices

Bieniek¹,

Luckner²,

Visscher³

et al. 2016

Journal of Aircraft

Self Cite

View full text Add to dashboard Cite

Simulation of aircraft wake-vortex encounters is regularly applied in the research toward revised aircraft separation minima. Most encounter flight simulation studies have used a pair of straight counter-rotating vortices. However, after being shed by the generating aircraft, the wake vortices begin to develop a growing deformation due to the long-wave Crow instability, especially under low-turbulent atmospheric conditions when vortices decay slowly. In this study, two methods for simulation of aircraft encounters with such perturbed wake vortices are described and compared. The first method uses a vortex simulation model, which is based on analytical models of the deformation that consider the large-scale vortex shapes. The second method applies vortex-velocity fields from high-fidelity largeeddy simulations. It offers the highest possible level of realism and is used as the reference. The resulting aircraft responses induced by wavy vortices and vortex rings are reproduced with good quality by the vortex simulation model. The comparison of both methods shows that the vortex simulation model captures the overall impact of vortex deformation on the aircraft upsets. It can be used for future safety assessments that require a large number of encounter simulations.

show abstract

Effect of a Wind Turbine on the Turbulent Inflow

Branlard

2017

Research Topics in Wind Energy

View full text Add to dashboard Cite

Aircraft Vortices in Stably Stratified and Weakly Turbulent Atmospheres: Simulation and Modeling

Cited by 50 publications

References 54 publications

Multimodel Ensemble Methods for Prediction of Wake-Vortex Transport and Decay

Multimodel Ensemble Methods for Prediction of Wake-Vortex Transport and Decay

Simulation Methods for Aircraft Encounters with Deformed Wake Vortices

Effect of a Wind Turbine on the Turbulent Inflow

Contact Info

Product

Resources

About