Vortex tubes in shear-stratified turbulent flows

Marie Farge, Alexandre Azzalini, Alex Mahalov, Basil Nicolaenko, Frank Tse, Giulio Pellegrino, Kai Schneider

Research output: Chapter in Book/Report/Conference proceedingChapter

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.

Original languageEnglish (US)
Title of host publicationTubes, Sheets and Singularities in Fluid Dynamics
PublisherKluwer Academic Publishers
Pages217-228
Number of pages12
ISBN (Print)1402009801, 9781402009808
DOIs
StatePublished - 2004

Publication series

NameFluid Mechanics and its Applications
Volume71
ISSN (Print)0926-5112

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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  • Cite this

    Farge, M., Azzalini, A., Mahalov, A., Nicolaenko, B., Tse, F., Pellegrino, G., & Schneider, K. (2004). Vortex tubes in shear-stratified turbulent flows. In Tubes, Sheets and Singularities in Fluid Dynamics (pp. 217-228). (Fluid Mechanics and its Applications; Vol. 71). Kluwer Academic Publishers. https://doi.org/10.1007/0-306-48420-x_29