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Vortex tubes in shear-stratified turbulent flows

  • Marie Farge
  • Alexandre Azzalini
  • Alex Mahalov 
  • Basil Nicolaenko
  • Frank Tse
  • Giulio Pellegrino
  • Kai Schneider
Conference paper
Part of the Fluid Mechanics and Its Applications book series (FMIA, volume 71)

Abstract

Coherent vortex extraction using wavelets is applied to a shear-stratified turbulent flow computed by Direct Numerical Simulations (DNS) to compute the atmospheric jet stream at the tropopause. The basic state is characterised by a jet centred at the tropopause and stable density stratification profile with increased stratification above the tropopause. Quasi-equilibrium turbulent flow-fields are obtained after long-time integration of the governing equations written in primitive variables using adaptive spectral domain decomposition method. The coherent vortex tubes are extracted from the vorticity and potential vorticity fields, using a nonlinear filtering in wavelet space. It is finally checked that the coherent vortex tubes exhibit the same dynamics as the total flow and therefore drive the residual background flow.

Keywords

Potential Vorticity Vortex Tube Vorticity Field Coherent Vortex Gradient Richardson Number 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Marie Farge
    • 1
  • Alexandre Azzalini
    • 1
  • Alex Mahalov 
    • 2
  • Basil Nicolaenko
    • 2
  • Frank Tse
    • 2
  • Giulio Pellegrino
    • 3
  • Kai Schneider
    • 3
  1. 1.LMD-CNRS, École Normale Supérieure, ParisParis Cedex 5France
  2. 2.Department of MathematicsArizona State UniversityTempeUSA
  3. 3.Centre de Mathématiques et d’InformatiqueUniversité de ProvenceMarseille Cedex 13France

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