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Title: Local dynamic perturbation effects on amplitude modulation in turbulent boundary layer flow based on triple decomposition
Authors: Tang, Zhanqi
Jiang, Nan
Zheng, Xiaobo
Wu, Yanhua
Keywords: Amplitude Modulation
Boundary Layer Flow
DRNTU::Engineering::Mechanical engineering
Issue Date: 2019
Source: 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
Series/Report no.: Physics of Fluids
Abstract: 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.
ISSN: 1070-6631
DOI: 10.1063/1.5083224
Rights: © 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).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles


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