Proper orthogonal decomposition analysis of a puff in a pipe

David Moxey; Yuri Feldman; Paris Perdikaris; Joseph Insley; Alexander Yakhot; Spencer Sherwin; George Karniadakis

Proper orthogonal decomposition analysis of a puff in a pipe

David Moxey, Yuri Feldman, Paris Perdikaris, Joseph Insley, Alexander Yakhot, Spencer Sherwin, George Karniadakis

Department of Mechanical Engineering

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

Abstract

We have performed direct numerical simulations of transitional turbulence in pipe flow for Re=2,250. The results confirm the existence of a spatio-temporal intermittency when turbulence is localized in a puff convected downstream. To analyze the turbulence, we follow a turbulent puff by a 3D moving-window centered at the location of the maximum total energy of transverse (turbulent) motion. The flow field data collected over 6,000 time instances (snapshots) have been analyzed by Proper Orthogonal Decomposition (POD) and used for identifying vortical structures. The presence of large-scale structures in a puff has been found by time-averaging of the cross-sectional turbulent velocity field and confirmed by POD analysis and by applying the Q- and λ₂-criteria.

Original language	English
State	Published - 1 Jan 2015
Event	9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 - Melbourne, Australia Duration: 30 Jun 2015 → 3 Jul 2015

Conference

Conference	9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
Country/Territory	Australia
City	Melbourne
Period	30/06/15 → 3/07/15

ASJC Scopus subject areas

Fluid Flow and Transfer Processes

Cite this

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title = "Proper orthogonal decomposition analysis of a puff in a pipe",

abstract = "We have performed direct numerical simulations of transitional turbulence in pipe flow for Re=2,250. The results confirm the existence of a spatio-temporal intermittency when turbulence is localized in a puff convected downstream. To analyze the turbulence, we follow a turbulent puff by a 3D moving-window centered at the location of the maximum total energy of transverse (turbulent) motion. The flow field data collected over 6,000 time instances (snapshots) have been analyzed by Proper Orthogonal Decomposition (POD) and used for identifying vortical structures. The presence of large-scale structures in a puff has been found by time-averaging of the cross-sectional turbulent velocity field and confirmed by POD analysis and by applying the Q- and λ2-criteria.",

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T1 - Proper orthogonal decomposition analysis of a puff in a pipe

AU - Moxey, David

AU - Feldman, Yuri

AU - Perdikaris, Paris

AU - Insley, Joseph

AU - Yakhot, Alexander

AU - Sherwin, Spencer

AU - Karniadakis, George

PY - 2015/1/1

Y1 - 2015/1/1

N2 - We have performed direct numerical simulations of transitional turbulence in pipe flow for Re=2,250. The results confirm the existence of a spatio-temporal intermittency when turbulence is localized in a puff convected downstream. To analyze the turbulence, we follow a turbulent puff by a 3D moving-window centered at the location of the maximum total energy of transverse (turbulent) motion. The flow field data collected over 6,000 time instances (snapshots) have been analyzed by Proper Orthogonal Decomposition (POD) and used for identifying vortical structures. The presence of large-scale structures in a puff has been found by time-averaging of the cross-sectional turbulent velocity field and confirmed by POD analysis and by applying the Q- and λ2-criteria.

AB - We have performed direct numerical simulations of transitional turbulence in pipe flow for Re=2,250. The results confirm the existence of a spatio-temporal intermittency when turbulence is localized in a puff convected downstream. To analyze the turbulence, we follow a turbulent puff by a 3D moving-window centered at the location of the maximum total energy of transverse (turbulent) motion. The flow field data collected over 6,000 time instances (snapshots) have been analyzed by Proper Orthogonal Decomposition (POD) and used for identifying vortical structures. The presence of large-scale structures in a puff has been found by time-averaging of the cross-sectional turbulent velocity field and confirmed by POD analysis and by applying the Q- and λ2-criteria.

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M3 - Paper

AN - SCOPUS:85034441682

T2 - 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015

Y2 - 30 June 2015 through 3 July 2015

ER -

Proper orthogonal decomposition analysis of a puff in a pipe

Abstract

Conference

ASJC Scopus subject areas

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