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Hydrodynamic wrinkling of an elastic loop in transient radial flow.

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Title: Hydrodynamic wrinkling of an elastic loop in transient radial flow.
Authors: Joung, Seyoung1, Jung, Cheolgyun1, Kim, Daegyoum1 daegyoum@kaist.ac.kr
Source: Journal of Fluid Mechanics. 6/10/2026, Vol. 1036, p1-25. 25p.
Subjects: Wrinkle patterns, Dynamic pressure, Elastic deformation, Elastic structures (Mechanics), Mechanical buckling, Elasticity, Fluid dynamics, Radial flow
Abstract: When the compression exerted on a thin elastic structure is sufficient to cause buckling instability, a regular wrinkle pattern emerges. The formation of wrinkles can be achieved and mechanically guided by transient external loading. As a novel dynamic wrinkling mechanism, we introduce the hydrodynamic coupling between elasticity and pressure induced by transient flow. A circular elastic loop immersed in an expanding fluid-filled gap undergoes buckling due to the net hydrodynamic pressure between its inner and outer surfaces, yielding a time-dependent wrinkle pattern. Because of the transient features of the hydrodynamic pressure, the apparent mode of the wrinkles reaches the maximum mode number immediately after the instant of peak pressure, followed by a cascade to lower modes. The maximum mode number of the wrinkles is determined by the magnitude of the peak pressure. In contrast to an elastic loop of uniform thickness, varying the thickness distribution of the loop and facilitating buckling at specific local points produce a distinct wrinkle pattern with a specific low mode consistently over time. [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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 194752302
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  Data: Hydrodynamic wrinkling of an elastic loop in transient radial flow.
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  Data: <searchLink fieldCode="AR" term="%22Joung%2C+Seyoung%22">Joung, Seyoung</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Jung%2C+Cheolgyun%22">Jung, Cheolgyun</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kim%2C+Daegyoum%22">Kim, Daegyoum</searchLink><relatesTo>1</relatesTo><i> daegyoum@kaist.ac.kr</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluid+Mechanics%22">Journal of Fluid Mechanics</searchLink>. 6/10/2026, Vol. 1036, p1-25. 25p.
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  Data: <searchLink fieldCode="DE" term="%22Wrinkle+patterns%22">Wrinkle patterns</searchLink><br /><searchLink fieldCode="DE" term="%22Dynamic+pressure%22">Dynamic pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Elastic+deformation%22">Elastic deformation</searchLink><br /><searchLink fieldCode="DE" term="%22Elastic+structures+%28Mechanics%29%22">Elastic structures (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+buckling%22">Mechanical buckling</searchLink><br /><searchLink fieldCode="DE" term="%22Elasticity%22">Elasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+dynamics%22">Fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Radial+flow%22">Radial flow</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: When the compression exerted on a thin elastic structure is sufficient to cause buckling instability, a regular wrinkle pattern emerges. The formation of wrinkles can be achieved and mechanically guided by transient external loading. As a novel dynamic wrinkling mechanism, we introduce the hydrodynamic coupling between elasticity and pressure induced by transient flow. A circular elastic loop immersed in an expanding fluid-filled gap undergoes buckling due to the net hydrodynamic pressure between its inner and outer surfaces, yielding a time-dependent wrinkle pattern. Because of the transient features of the hydrodynamic pressure, the apparent mode of the wrinkles reaches the maximum mode number immediately after the instant of peak pressure, followed by a cascade to lower modes. The maximum mode number of the wrinkles is determined by the magnitude of the peak pressure. In contrast to an elastic loop of uniform thickness, varying the thickness distribution of the loop and facilitating buckling at specific local points produce a distinct wrinkle pattern with a specific low mode consistently over time. [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:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1017/jfm.2026.11651
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 25
        StartPage: 1
    Subjects:
      – SubjectFull: Wrinkle patterns
        Type: general
      – SubjectFull: Dynamic pressure
        Type: general
      – SubjectFull: Elastic deformation
        Type: general
      – SubjectFull: Elastic structures (Mechanics)
        Type: general
      – SubjectFull: Mechanical buckling
        Type: general
      – SubjectFull: Elasticity
        Type: general
      – SubjectFull: Fluid dynamics
        Type: general
      – SubjectFull: Radial flow
        Type: general
    Titles:
      – TitleFull: Hydrodynamic wrinkling of an elastic loop in transient radial flow.
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            NameFull: Joung, Seyoung
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            NameFull: Jung, Cheolgyun
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            NameFull: Kim, Daegyoum
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          Dates:
            – D: 10
              M: 06
              Text: 6/10/2026
              Type: published
              Y: 2026
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              Value: 1036
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            – TitleFull: Journal of Fluid Mechanics
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