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Characterization of vortex regeneration mechanism in the self-sustaining process of wall-bounded flows using resolvent analysis

Bae, H. Jane and McKeon, Beverley J. (2020) Characterization of vortex regeneration mechanism in the self-sustaining process of wall-bounded flows using resolvent analysis. Journal of Physics Conference Series, 1522 . Art. No. 012001. ISSN 1742-6588. doi:10.1088/1742-6596/1522/1/012001.

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The regeneration mechanism of streamwise vortical structures in the self-sustaining process of wall-bounded turbulence is investigated. Resolvent analysis [1] is used to identify the principal forcing mode which produces the maximum amplification of the response modes in the minimal channel for the buffer [2] and logarithmic layer [3]. The identified mode is then projected out from the nonlinear term of the Navier-Stokes equations at each time step from the direct numerical simulations (DNS) of the corresponding minimal channel. The results show that the removal of the principal forcing mode is able to significantly inhibit turbulence for the buffer and logarithmic layer while removing the subsequent modes instead of the principal one only marginally affects the flow. Analysis of the dyadic interactions in the nonlinear term shows that the contributions toward the principal forcing mode come from a limited number of wavenumber interactions. Using conditional averaging, the flow structures that are responsible for generating the principal forcing mode, and thus the nonlinear interaction to self-sustain turbulence, are identified to be spanwise rolls interacting with meandering streaks.

Item Type:Article
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URLURL TypeDescription
Bae, H. Jane0000-0001-6789-6209
McKeon, Beverley J.0000-0003-4220-1583
Additional Information:© 2020 the Author(s). Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. This work was funded in part by the Coturb program of the European Research Council. The authors thank Dr. Adrián Lozano-Durán, Dr. Yongseok Kwon, and Dr. Anna Guseva for their insightful comments.
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European Research Council (ERC)UNSPECIFIED
Record Number:CaltechAUTHORS:20200701-133438084
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Official Citation:H. Jane Bae and Beverley J. McKeon 2020 J. Phys.: Conf. Ser. 1522 012001
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104191
Deposited By: George Porter
Deposited On:01 Jul 2020 20:50
Last Modified:12 Jul 2022 16:56

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