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Numerical Study of a Long-Lived, Isolated Wake Vortex in Ground Effect
| 题名： | Numerical Study of a Long-Lived, Isolated Wake Vortex in Ground Effect |
| 作者： | Proctor, F. H. |
| 关键词： | Vortices##Aircraft wakes##Mathematical models##Large eddy simulation##Ground effect(Aerodynamics)##Wind direction##Decay rates##Predictions##Computational fluid dynamics##Derivation## |
| 摘要： | This paper examines a case observed during the 1990 Idaho Falls Test program, in which a wake vortex having an unusually long lifetime was observed while in ground effect. A numerical simulation is performed with a Large Eddy Simulation model to understand the response of the environment in affecting this event. In the simulation, it was found that one of the vortices decayed quickly, with the remaining vortex persisting beyond the time-bound of typical vortex lifetimes. This unusual behavior was found to be related to the first and second vertical derivatives of the ambient crosswind. |
| 总页数： | 11 |
| 报告类型： | 科技报告 |
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