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LARGE EDDY SIMULATIONS OF AIRCRAFT WAKE VORTICES IN A STABLY STRATIFIED ATMOSPHERE

I. De Visscher
Mechanical Engineering Department, Division TERM, Louvain School of Engineering (EPL), Université catholique de Louvain (UCL), 2 Place du Levant, 1348, Louvain-la-Neuve, Belgium

Laurent Bricteux
Mechanical Engineering Department, Division TERM, also Center for Systems Engineering and Applied Mechanics (CESAME) Universite catholique de Louvain (UCL) Louvain-la-Neuve, Belgium

Gregoire Winckelmans
Mechanical Engineering Department, Division TERM, also Center for Systems Engineering and Applied Mechanics (CESAME) Universite catholique de Louvain (UCL) Louvain-la-Neuve, Belgium

S. Caliaro
Mechanical Engineering Department, Division TERM, Louvain School of Engineering (EPL), Université catholique de Louvain (UCL), 2 Place du Levant, 1348, Louvain-la-Neuve, Belgium

T. Vilbajo
Mechanical Engineering Department, Division TERM, Louvain School of Engineering (EPL), Université catholique de Louvain (UCL), 2 Place du Levant, 1348, Louvain-la-Neuve, Belgium

Аннотация

In this paper, we present Large Eddy Simulation (LES) results of aircraft wake vortices evolving in a stably stratified atmosphere. The results were obtained using a pseudospectral Navier-Stokes solver. Three stratification cases were investigated, from moderate (N* = 0.75) to very high (N* = 1.4). A 3-D visualization of the flow field is also provided, for the case N* = 1.0, in order to highlight the salient features of the flow. The wake vortex system time evolution is analyzed, for all cases, using global diagnostics (trajectory and circulation of the primary wake vortices). The results are compared and discussed. The results of this work will also enable the improvement and calibration of wake vortex behavior operational models, such as the Deterministic/ Probabilistic wake Vortex Model (DVM/PVM, see De Visscher et al., 2008).