Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition

This work studies amplitude modulation (AM) of a turbulent boundary layer flow perturbed by a wall-mounted piezoelectric (PZT) actuator. Hot-wire measurements were executed downstream of the PZT actuator working at a certain frequency but several different amplitudes. Turbulent nonlinear fluctuation...

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Main Authors: Tang, Zhanqi, Jiang, Nan, Zheng, Xiaobo, Wu, Yanhua
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2019
Subjects:
Online Access:https://hdl.handle.net/10356/105660
http://hdl.handle.net/10220/48723
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1056602023-03-04T17:20:51Z Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition Tang, Zhanqi Jiang, Nan Zheng, Xiaobo Wu, Yanhua School of Mechanical and Aerospace Engineering Amplitude Modulation Boundary Layer Flow DRNTU::Engineering::Mechanical engineering This work studies amplitude modulation (AM) of a turbulent boundary layer flow perturbed by a wall-mounted piezoelectric (PZT) actuator. Hot-wire measurements were executed downstream of the PZT actuator working at a certain frequency but several different amplitudes. Turbulent nonlinear fluctuations acquired by triple decomposition were devoted to observing the AM effects. The PZT actuator has a significant impact on the distribution of AM coefficients and joint probability-density functions of large-scale fluctuations and the representatives of small scales in the inner region. Moreover, the energy dependence of small scales on large-scale structures was observed. It proposes that an interlayer region ofy+.14 characterized by strong energy dependence of high linear slope occurs between innate near-wall structures in the underlying boundary layer flow and wall surface. It was suggested that this interlayer probably suppresses turbulence generation and self-sustaining process of the near-wall cycle. In addition, the conditional AM coefficients further manifests that the AM in the interlayer is insensitive to the condition of large-scale structures. Published version 2019-06-13T06:05:13Z 2019-12-06T21:55:23Z 2019-06-13T06:05:13Z 2019-12-06T21:55:23Z 2019 Journal Article Tang, Z., Jiang, N., Zheng, X., & Wu, Y. (2019). Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition. Physics of Fluids, 31(2), 025120-. doi:10.1063/1.5083224 1070-6631 https://hdl.handle.net/10356/105660 http://hdl.handle.net/10220/48723 10.1063/1.5083224 en Physics of Fluids © 2019 The Author(s). All rights reserved. This paper was published by AIP Publishing in Physics of Fluids and is made available with permission of The Author(s). 14 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Amplitude Modulation
Boundary Layer Flow
DRNTU::Engineering::Mechanical engineering
spellingShingle Amplitude Modulation
Boundary Layer Flow
DRNTU::Engineering::Mechanical engineering
Tang, Zhanqi
Jiang, Nan
Zheng, Xiaobo
Wu, Yanhua
Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition
description This work studies amplitude modulation (AM) of a turbulent boundary layer flow perturbed by a wall-mounted piezoelectric (PZT) actuator. Hot-wire measurements were executed downstream of the PZT actuator working at a certain frequency but several different amplitudes. Turbulent nonlinear fluctuations acquired by triple decomposition were devoted to observing the AM effects. The PZT actuator has a significant impact on the distribution of AM coefficients and joint probability-density functions of large-scale fluctuations and the representatives of small scales in the inner region. Moreover, the energy dependence of small scales on large-scale structures was observed. It proposes that an interlayer region ofy+.14 characterized by strong energy dependence of high linear slope occurs between innate near-wall structures in the underlying boundary layer flow and wall surface. It was suggested that this interlayer probably suppresses turbulence generation and self-sustaining process of the near-wall cycle. In addition, the conditional AM coefficients further manifests that the AM in the interlayer is insensitive to the condition of large-scale structures.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Tang, Zhanqi
Jiang, Nan
Zheng, Xiaobo
Wu, Yanhua
format Article
author Tang, Zhanqi
Jiang, Nan
Zheng, Xiaobo
Wu, Yanhua
author_sort Tang, Zhanqi
title Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition
title_short Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition
title_full Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition
title_fullStr Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition
title_full_unstemmed Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition
title_sort local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition
publishDate 2019
url https://hdl.handle.net/10356/105660
http://hdl.handle.net/10220/48723
_version_ 1759854954831413248