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Flow control of a plunging cylinder based on resolvent analysis.

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Title: Flow control of a plunging cylinder based on resolvent analysis.
Authors: Lin, Ching-Te1 (AUTHOR), Tsai, Min-Lin1 (AUTHOR), Tsai, Hsieh-Chen1 (AUTHOR) hsiehchentsai@ntu.edu.tw
Source: Journal of Fluid Mechanics. 7/25/2023, Vol. 967, p1-19. 19p. 1 Color Photograph, 1 Diagram, 8 Graphs.
Abstract: We design an open-loop active flow control for separated flows around a plunging circular cylinder based on resolvent analysis. The cylinder is plunging at a Strouhal number of 0.36 and a Reynolds number of 500. A linear time-periodic system for control is obtained by linearizing the non-inertial incompressible vorticity equation in the cylinder-fixed frame about a time-averaged base flow. Using the Lyapunouv–Floquet transformation, the linear time-periodic system is transformed into a similar linear time-invariant system, whose resolvent is analysed to obtain an optimal actuating Strouhal number of 0.1464 for the transformed linear system. Simulations show that the active control with tangential actuations is capable of reducing the lift fluctuation by up to 25.7 % when the flow is actuated near the predicted harmonic and subharmonic frequencies. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Fluid Mechanics is the property of Cambridge University Press and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 187730036
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  Data: Flow control of a plunging cylinder based on resolvent analysis.
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  Data: <searchLink fieldCode="AR" term="%22Lin%2C+Ching-Te%22">Lin, Ching-Te</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tsai%2C+Min-Lin%22">Tsai, Min-Lin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tsai%2C+Hsieh-Chen%22">Tsai, Hsieh-Chen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hsiehchentsai@ntu.edu.tw</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluid+Mechanics%22">Journal of Fluid Mechanics</searchLink>. 7/25/2023, Vol. 967, p1-19. 19p. 1 Color Photograph, 1 Diagram, 8 Graphs.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: We design an open-loop active flow control for separated flows around a plunging circular cylinder based on resolvent analysis. The cylinder is plunging at a Strouhal number of 0.36 and a Reynolds number of 500. A linear time-periodic system for control is obtained by linearizing the non-inertial incompressible vorticity equation in the cylinder-fixed frame about a time-averaged base flow. Using the Lyapunouv–Floquet transformation, the linear time-periodic system is transformed into a similar linear time-invariant system, whose resolvent is analysed to obtain an optimal actuating Strouhal number of 0.1464 for the transformed linear system. Simulations show that the active control with tangential actuations is capable of reducing the lift fluctuation by up to 25.7 % when the flow is actuated near the predicted harmonic and subharmonic frequencies. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Fluid Mechanics is the property of Cambridge University Press and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1017/jfm.2023.526
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      – Code: eng
        Text: English
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        PageCount: 19
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      – TitleFull: Flow control of a plunging cylinder based on resolvent analysis.
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            NameFull: Lin, Ching-Te
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            NameFull: Tsai, Min-Lin
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            NameFull: Tsai, Hsieh-Chen
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            – D: 25
              M: 07
              Text: 7/25/2023
              Type: published
              Y: 2023
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              Value: 967
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