### 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 language | English (US) |
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Title of host publication | Fluid Mechanics and its Applications |

Pages | 217-228 |

Number of pages | 12 |

Volume | 71 |

State | Published - 2004 |

### Publication series

Name | Fluid Mechanics and its Applications |
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Volume | 71 |

ISSN (Print) | 09265112 |

### Fingerprint

### ASJC Scopus subject areas

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

### Cite this

*Fluid Mechanics and its Applications*(Vol. 71, pp. 217-228). (Fluid Mechanics and its Applications; Vol. 71).

**Vortex tubes in shear-stratified turbulent flows.** / Farge, Marie; Azzalini, Alexandre; Mahalov, Alex; Nicolaenko, Basil; Tse, Frank; Pellegrino, Giulio; Schneider, Kai.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

*Fluid Mechanics and its Applications.*vol. 71, Fluid Mechanics and its Applications, vol. 71, pp. 217-228.

}

TY - CHAP

T1 - Vortex tubes in shear-stratified turbulent flows

AU - Farge, Marie

AU - Azzalini, Alexandre

AU - Mahalov, Alex

AU - Nicolaenko, Basil

AU - Tse, Frank

AU - Pellegrino, Giulio

AU - Schneider, Kai

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84859844152&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859844152&partnerID=8YFLogxK

M3 - Chapter

AN - SCOPUS:84859844152

SN - 1402009801

SN - 9781402009808

VL - 71

T3 - Fluid Mechanics and its Applications

SP - 217

EP - 228

BT - Fluid Mechanics and its Applications

ER -