Wake-vortex topology, circulation, and turbulent exchange processes

Frank Holzäpfel, Takashi Misaka, Ingo Hennemann

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

19 Citations (Scopus)

Abstract

Large eddy simulations of aircraft wake vortex evolution in various turbulent and stably stratified atmospheric environments have been conducted with two different LES codes. Passive tracers are used to investigate exchange processes between the vortex cores, the vortex oval and its environment as well as redistribution processes along the vortex tubes. A post processing method is employed to identify the vortex center lines even in progressed states of vortex decay where the coherent vortex structure is getting lost. This method allows, for example, analyzing the circulation evolution of vortex rings, establishing statistics of vortex deformation, and revealing the mechanisms of the vortex bursting phenomenon. Vortex bursting is related to the collision of secondary vorticity structures propagating along the vortex lines. In neutrally and weakly stratified environments long-living vortex rings are observed where circulation decay proceeds in three phases. During the initial diffusion phase vortex decay may depend on integral turbulence length scales. On average, the detrainment of a passive tracer from the primary vortices is correlated with circulation decay.

Original languageEnglish
Title of host publicationAIAA Atmospheric and Space Environments Conference 2010
DOIs
Publication statusPublished - 2010
EventAIAA Atmospheric and Space Environments Conference 2010 - Toronto, ON, Canada
Duration: 2010 Aug 22010 Aug 5

Publication series

NameAIAA Atmospheric and Space Environments Conference 2010

Other

OtherAIAA Atmospheric and Space Environments Conference 2010
CountryCanada
CityToronto, ON
Period10/8/210/8/5

ASJC Scopus subject areas

  • Atmospheric Science
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Wake-vortex topology, circulation, and turbulent exchange processes'. Together they form a unique fingerprint.

Cite this