Vles of Aircraft Wake Vortices in a Turbulent Atmosphere: A Study of Decay
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Very Large-Eddy Simulations (VLES) of aircraft wake vortices in various atmospheric turbulence conditions are carried out. The turbulence level is characterized by the eddy dissipation rateand ranges from very strong to weak. The turbulence is assumed isotropic. Two LES models are considered. Most simulations were done using explicit gaussian filtering and a mixed model: thetensor-diffusivity model supplemented by a dynamic Smagorinsky term. As a point of comparison, some simulations were done using the classical dynamic Smagorinsky model alone (thus without explicit filtering). Initially, the wake vortices are assumed to follow the fairly “universal” circulation profile shortly after rollup. The vortex global circulation is investigated: its decay exhibits a similar behavior in all cases, leading to the exponential decay model based on the eddy dissipation rate. The present model differs from others by the presence of a time delay before the exponential decay. The constant defining the decay rate is also found to be quite different from that found in the literature. This lack of agreement is partially explained by the differences in the definitions of circulations.
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- Vles of Aircraft Wake Vortices in a Turbulent Atmosphere: A Study of Decay
- Book Title
- Advances in LES of Complex Flows
- Book Subtitle
- Proceedings of the Euromech Colloquium 412, held in Munich, Germany 4–6 October 2000
- Book Part
- pp 311-326
- Print ISBN
- Online ISBN
- Series Title
- Fluid Mechanics and Its Applications
- Series Volume
- Series ISSN
- Springer Netherlands
- Copyright Holder
- Kluwer Academic Publishers
- Additional Links
- eBook Packages
- Editor Affiliations
- 2. Fachgebiet Strömungsmechanik, Technische Universität München
- 3. Institut für Hydromechanik, Universität Karlsruhe
- Author Affiliations
- 4. Center for Systems Engineering and Applied Mechanics, Mechanical Engineering Department, Université catholique de Louvain, 1348, Louvain-la-Neuve, Belgium
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