Detached coherent structures in Channel revisited: Comparison with homogeneous shear turbulence

Siwei Dong; Adrián Lozano-Durán; Atsushi Sekimoto; Javier Jiménez

Detached coherent structures in Channel revisited: Comparison with homogeneous shear turbulence

Siwei Dong, Adrián Lozano-Durán, Atsushi Sekimoto, Javier Jiménez

Research output: Contribution to conference › Paper › peer-review

Abstract

Coherent structures in statistically-stationary homogeneous shear turbulence (HST) are compared with those of the detached family in channels. Similarly to attached ones, detached Qs in channels form streamwise trains of side-by-side groups of a Q2 and a Q4. This is also true in HST. Contrary to attached structures, but similarly to those in HST, detached Q4s in channels are comparable in size to their related high-streamwise velocity streaks. Vortex clusters tend to associate with Q2s and Q4s, equally distributed between them in HST but more closely with Q2s in channels. The results strongly suggest that coherent structures in channels are not particularly associated with the wall, or even with a given shear profile.

Original language	English
Publication status	Published - 2015
Externally published	Yes
Event	15th European Turbulence Conference, ETC 2015 - Delf, Netherlands Duration: Aug 25 2015 → Aug 28 2015

Conference

Conference	15th European Turbulence Conference, ETC 2015
Country/Territory	Netherlands
City	Delf
Period	8/25/15 → 8/28/15

ASJC Scopus subject areas

Atmospheric Science
Geophysics
Astronomy and Astrophysics
Acoustics and Ultrasonics

Cite this

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title = "Detached coherent structures in Channel revisited: Comparison with homogeneous shear turbulence",

abstract = "Coherent structures in statistically-stationary homogeneous shear turbulence (HST) are compared with those of the detached family in channels. Similarly to attached ones, detached Qs in channels form streamwise trains of side-by-side groups of a Q2 and a Q4. This is also true in HST. Contrary to attached structures, but similarly to those in HST, detached Q4s in channels are comparable in size to their related high-streamwise velocity streaks. Vortex clusters tend to associate with Q2s and Q4s, equally distributed between them in HST but more closely with Q2s in channels. The results strongly suggest that coherent structures in channels are not particularly associated with the wall, or even with a given shear profile.",

author = "Siwei Dong and Adri{\'a}n Lozano-Dur{\'a}n and Atsushi Sekimoto and Javier Jim{\'e}nez",

note = "Funding Information: Funded by the European Research Council Multiflow grant ERC-2010.AdG-20100224. Publisher Copyright: {\textcopyright} TU Delft.; 15th European Turbulence Conference, ETC 2015 ; Conference date: 25-08-2015 Through 28-08-2015",

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TY - CONF

T1 - Detached coherent structures in Channel revisited

T2 - 15th European Turbulence Conference, ETC 2015

AU - Dong, Siwei

AU - Lozano-Durán, Adrián

AU - Sekimoto, Atsushi

AU - Jiménez, Javier

PY - 2015

Y1 - 2015

N2 - Coherent structures in statistically-stationary homogeneous shear turbulence (HST) are compared with those of the detached family in channels. Similarly to attached ones, detached Qs in channels form streamwise trains of side-by-side groups of a Q2 and a Q4. This is also true in HST. Contrary to attached structures, but similarly to those in HST, detached Q4s in channels are comparable in size to their related high-streamwise velocity streaks. Vortex clusters tend to associate with Q2s and Q4s, equally distributed between them in HST but more closely with Q2s in channels. The results strongly suggest that coherent structures in channels are not particularly associated with the wall, or even with a given shear profile.

AB - Coherent structures in statistically-stationary homogeneous shear turbulence (HST) are compared with those of the detached family in channels. Similarly to attached ones, detached Qs in channels form streamwise trains of side-by-side groups of a Q2 and a Q4. This is also true in HST. Contrary to attached structures, but similarly to those in HST, detached Q4s in channels are comparable in size to their related high-streamwise velocity streaks. Vortex clusters tend to associate with Q2s and Q4s, equally distributed between them in HST but more closely with Q2s in channels. The results strongly suggest that coherent structures in channels are not particularly associated with the wall, or even with a given shear profile.

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M3 - Paper

AN - SCOPUS:85085777076

Y2 - 25 August 2015 through 28 August 2015

ER -

Detached coherent structures in Channel revisited: Comparison with homogeneous shear turbulence

Abstract

Conference

ASJC Scopus subject areas

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