Wake evolution of high-lift configuration from roll-up to vortex decay

Takashi Misaka, Frank Holzäpfel, Thomas Gerz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Citations (Scopus)

Abstract

The development of aircraft's wake in high-lift configuration is studied from the rollup until vortex decay. An aircraft model and the surrounding flow field obtained from high-fidelity Reynolds-averaged Navier-Stokes simulation are swept through a ground-fixed computational domain to initialize the wake. After the wake initialization, the large-eddy simulation (LES) of the vortical wake is performed until vortex decay. In this paper we consider an aircraft model in high-lift configuration where flaps and slats are deployed. In a few wingspan lengths downstream, the complex vorticity structures of the aircraft wake focus on co-rotating vortex pairs originated from wing and flap-tips. The co-rotating vortex pairs merge at t* = 0.25 and a common counter-rotating vortex pair is formed at around t* = 1.0 entraining the turbulent aircraft wake into the vortex system. The rolled-up vortex features axial velocity in the vortex core with a magnitude of a half of the maximum tangential velocity. Behavior of the formed vortex pair is similar to that of a vortex pair defined by a vortex model such as the Lamb-Oseen model. The initial descent speed of the vortices is slightly faster than that of the reference descent speed, i.e., w = 1.1w0. In addition it is confirmed that the ambient turbulence accelerates vortex linking and decay as in the case of a coherent vortex pair. The overall behavior of wake vortices is not affected by the different mesh resolutions considered here, except for vortex core radius.

Original languageEnglish
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
Publication statusPublished - 2013 Aug 21
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: 2013 Jan 72013 Jan 10

Publication series

Name51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

Other

Other51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
Country/TerritoryUnited States
CityGrapevine, TX
Period13/1/713/1/10

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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