Modeling of coherent structures in a turbulent jet as global linear instability wavepackets: Theory and experiment

Onofrio Semeraro; Lutz Lesshafft; Vincent Jaunet; Peter Jordan

doi:10.1016/j.ijheatfluidflow.2016.10.010

Modeling of coherent structures in a turbulent jet as global linear instability wavepackets: Theory and experiment

Onofrio Semeraro
, Lutz Lesshafft
, Vincent Jaunet
, Peter Jordan

Laboratoire d'Hydrodynamique de l'Ecole Polytechnique
Univ. Poitiers

Research output: Contribution to journal › Article › peer-review

Abstract

Perturbation wavepackets in a jet, induced by externally applied forcing, are computed from the linearized equations of motion. An experimentally measured mean flow serves as the base state for this linear analysis, and optimally amplified mono-frequency perturbations are identified, in the sense of maximal gain between the forcing energy input and the flow response energy. Sub-optimal orthogonal forcing/response structures are also discussed. Linear analysis results are then compared to measured perturbation wavepackets in the jet experiment. The study addresses the question to what extent the true dynamics of a turbulent jet can be represented by a model based on linear instability.

Original language	English
Pages (from-to)	24-32
Number of pages	9
Journal	International Journal of Heat and Fluid Flow
Volume	62
DOIs	https://doi.org/10.1016/j.ijheatfluidflow.2016.10.010
Publication status	Published - 1 Dec 2016

Keywords

Aeroacoustics
Frequency response analysis
Linear stability analysis
Turbulent jet

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10.1016/j.ijheatfluidflow.2016.10.010

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title = "Modeling of coherent structures in a turbulent jet as global linear instability wavepackets: Theory and experiment",

abstract = "Perturbation wavepackets in a jet, induced by externally applied forcing, are computed from the linearized equations of motion. An experimentally measured mean flow serves as the base state for this linear analysis, and optimally amplified mono-frequency perturbations are identified, in the sense of maximal gain between the forcing energy input and the flow response energy. Sub-optimal orthogonal forcing/response structures are also discussed. Linear analysis results are then compared to measured perturbation wavepackets in the jet experiment. The study addresses the question to what extent the true dynamics of a turbulent jet can be represented by a model based on linear instability.",

keywords = "Aeroacoustics, Frequency response analysis, Linear stability analysis, Turbulent jet",

author = "Onofrio Semeraro and Lutz Lesshafft and Vincent Jaunet and Peter Jordan",

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doi = "10.1016/j.ijheatfluidflow.2016.10.010",

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T2 - Theory and experiment

AU - Semeraro, Onofrio

AU - Lesshafft, Lutz

AU - Jaunet, Vincent

AU - Jordan, Peter

PY - 2016/12/1

Y1 - 2016/12/1

N2 - Perturbation wavepackets in a jet, induced by externally applied forcing, are computed from the linearized equations of motion. An experimentally measured mean flow serves as the base state for this linear analysis, and optimally amplified mono-frequency perturbations are identified, in the sense of maximal gain between the forcing energy input and the flow response energy. Sub-optimal orthogonal forcing/response structures are also discussed. Linear analysis results are then compared to measured perturbation wavepackets in the jet experiment. The study addresses the question to what extent the true dynamics of a turbulent jet can be represented by a model based on linear instability.

AB - Perturbation wavepackets in a jet, induced by externally applied forcing, are computed from the linearized equations of motion. An experimentally measured mean flow serves as the base state for this linear analysis, and optimally amplified mono-frequency perturbations are identified, in the sense of maximal gain between the forcing energy input and the flow response energy. Sub-optimal orthogonal forcing/response structures are also discussed. Linear analysis results are then compared to measured perturbation wavepackets in the jet experiment. The study addresses the question to what extent the true dynamics of a turbulent jet can be represented by a model based on linear instability.

KW - Aeroacoustics

KW - Frequency response analysis

KW - Linear stability analysis

KW - Turbulent jet

UR - https://www.scopus.com/pages/publications/85002301293

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M3 - Article

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SN - 0142-727X

VL - 62

SP - 24

EP - 32

JO - International Journal of Heat and Fluid Flow

JF - International Journal of Heat and Fluid Flow

ER -

Modeling of coherent structures in a turbulent jet as global linear instability wavepackets: Theory and experiment

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Keywords

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