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Vortex separation cascades in simulations of the planar flow past an impulsively started cylinder up to $\boldsymbol{Re=100}\ \boldsymbol{000}$.

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Title: Vortex separation cascades in simulations of the planar flow past an impulsively started cylinder up to $\boldsymbol{Re=100}\ \boldsymbol{000}$.
Authors: Chatzimanolakis, Michail1,2 (AUTHOR), Weber, Pascal1,2 (AUTHOR), Koumoutsakos, Petros1 (AUTHOR) petros@seas.harvard.edu
Source: Journal of Fluid Mechanics. 12/25/2022, Vol. 953, p1-11. 11p.
Subjects: Flow simulations, Reynolds number, Vortex shedding, Flow separation, Vortex motion, Reduced-order models
Abstract: Direct numerical simulations of the flow past an impulsively started cylinder at high Reynolds numbers (25k–100k) reveal an intriguing portrait of unsteady separation. Vorticity generation and vortex shedding entails a cascade of separation events on the cylinder surface that are reminiscent of Kelvin–Helmholtz instabilities. Primary vortices roll up along the cylinder surface as a result of instabilities of the initially attached vortex sheets, followed by vortex eruptions, creation of secondary vorticity and formation of dipole structures that are subsequently ejected from the surface of the cylinder. We analyse the vortical structures and their relationship to the forces experienced by the cylinder. This striking cascade of vortex instabilities may serve as reference for reduced-order models of flow separation and as guide for flow control of separated flows at high Reynolds numbers. [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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An: 161171684
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  Data: Vortex separation cascades in simulations of the planar flow past an impulsively started cylinder up to $\boldsymbol{Re=100}\ \boldsymbol{000}$.
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  Data: <searchLink fieldCode="AR" term="%22Chatzimanolakis%2C+Michail%22">Chatzimanolakis, Michail</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Weber%2C+Pascal%22">Weber, Pascal</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Koumoutsakos%2C+Petros%22">Koumoutsakos, Petros</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> petros@seas.harvard.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluid+Mechanics%22">Journal of Fluid Mechanics</searchLink>. 12/25/2022, Vol. 953, p1-11. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Flow+simulations%22">Flow simulations</searchLink><br /><searchLink fieldCode="DE" term="%22Reynolds+number%22">Reynolds number</searchLink><br /><searchLink fieldCode="DE" term="%22Vortex+shedding%22">Vortex shedding</searchLink><br /><searchLink fieldCode="DE" term="%22Flow+separation%22">Flow separation</searchLink><br /><searchLink fieldCode="DE" term="%22Vortex+motion%22">Vortex motion</searchLink><br /><searchLink fieldCode="DE" term="%22Reduced-order+models%22">Reduced-order models</searchLink>
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  Label: Abstract
  Group: Ab
  Data: Direct numerical simulations of the flow past an impulsively started cylinder at high Reynolds numbers (25k–100k) reveal an intriguing portrait of unsteady separation. Vorticity generation and vortex shedding entails a cascade of separation events on the cylinder surface that are reminiscent of Kelvin–Helmholtz instabilities. Primary vortices roll up along the cylinder surface as a result of instabilities of the initially attached vortex sheets, followed by vortex eruptions, creation of secondary vorticity and formation of dipole structures that are subsequently ejected from the surface of the cylinder. We analyse the vortical structures and their relationship to the forces experienced by the cylinder. This striking cascade of vortex instabilities may serve as reference for reduced-order models of flow separation and as guide for flow control of separated flows at high Reynolds numbers. [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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      – Type: doi
        Value: 10.1017/jfm.2022.988
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      – Code: eng
        Text: English
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        PageCount: 11
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    Subjects:
      – SubjectFull: Flow simulations
        Type: general
      – SubjectFull: Reynolds number
        Type: general
      – SubjectFull: Vortex shedding
        Type: general
      – SubjectFull: Flow separation
        Type: general
      – SubjectFull: Vortex motion
        Type: general
      – SubjectFull: Reduced-order models
        Type: general
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      – TitleFull: Vortex separation cascades in simulations of the planar flow past an impulsively started cylinder up to $\boldsymbol{Re=100}\ \boldsymbol{000}$.
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            NameFull: Chatzimanolakis, Michail
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            NameFull: Weber, Pascal
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            NameFull: Koumoutsakos, Petros
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            – D: 25
              M: 12
              Text: 12/25/2022
              Type: published
              Y: 2022
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              Value: 953
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