Coherent structures in Newtonian and viscoelastic turbulent planar jets.
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| Title: | Coherent structures in Newtonian and viscoelastic turbulent planar jets. |
|---|---|
| Authors: | Amor, Christian1, Corrochano, Adrián2, Soligo, Giovanni1,3, Le Clainche, Soledad2, Rosti, Marco Edoardo1 marco.rosti@oist.jp |
| Source: | Journal of Fluid Mechanics. 6/10/2026, Vol. 1036, p1-31. 31p. |
| Subjects: | Coherent structures, Viscoelastic materials, Flow instability, Matrix decomposition, Viscoelasticity, Newtonian fluids, Turbulent jets (Fluid dynamics), Turbulence |
| Abstract: | The addition of a small amount of long-chain polymers confers viscoelastic properties to Newtonian flows. The resulting non-Newtonian solution now exhibits a different dynamics, such as enhanced mixing at low Reynolds number, where elastic instabilities can trigger elastic turbulence even though inertial turbulence is absent. Here, we study this phenomenon in viscoelastic planar jets and, in particular, we do it from the perspective of coherent structures to understand how elastic turbulence is triggered and sustained, which remain barely explored in this set-up. We introduce the spatio-temporal Koopman decomposition for extracting the dominant flow patterns, and we compare them with those from Newtonian planar jets at high Reynolds number. Global flow structures are similar between jets, with low-frequency streaks and high-frequency wave packets dominating the turbulent dynamics. However, structures are strikingly different in the near field, where elasticity-driven streaks affect the dynamics in the potential core of the viscoelastic planar jet, modifying the bulk flow and interacting with the flow instability. The analysis of the polymer field reveals stretched polymer filaments and centre-mode structures, which support the implication of the near-field streaks sustaining elastic turbulence in three-dimensional viscoelastic planar jets. [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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 194752274 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Coherent structures in Newtonian and viscoelastic turbulent planar jets. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Amor%2C+Christian%22">Amor, Christian</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Corrochano%2C+Adrián%22">Corrochano, Adrián</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Soligo%2C+Giovanni%22">Soligo, Giovanni</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Le+Clainche%2C+Soledad%22">Le Clainche, Soledad</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Rosti%2C+Marco+Edoardo%22">Rosti, Marco Edoardo</searchLink><relatesTo>1</relatesTo><i> marco.rosti@oist.jp</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluid+Mechanics%22">Journal of Fluid Mechanics</searchLink>. 6/10/2026, Vol. 1036, p1-31. 31p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Coherent+structures%22">Coherent structures</searchLink><br /><searchLink fieldCode="DE" term="%22Viscoelastic+materials%22">Viscoelastic materials</searchLink><br /><searchLink fieldCode="DE" term="%22Flow+instability%22">Flow instability</searchLink><br /><searchLink fieldCode="DE" term="%22Matrix+decomposition%22">Matrix decomposition</searchLink><br /><searchLink fieldCode="DE" term="%22Viscoelasticity%22">Viscoelasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Newtonian+fluids%22">Newtonian fluids</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulent+jets+%28Fluid+dynamics%29%22">Turbulent jets (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulence%22">Turbulence</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The addition of a small amount of long-chain polymers confers viscoelastic properties to Newtonian flows. The resulting non-Newtonian solution now exhibits a different dynamics, such as enhanced mixing at low Reynolds number, where elastic instabilities can trigger elastic turbulence even though inertial turbulence is absent. Here, we study this phenomenon in viscoelastic planar jets and, in particular, we do it from the perspective of coherent structures to understand how elastic turbulence is triggered and sustained, which remain barely explored in this set-up. We introduce the spatio-temporal Koopman decomposition for extracting the dominant flow patterns, and we compare them with those from Newtonian planar jets at high Reynolds number. Global flow structures are similar between jets, with low-frequency streaks and high-frequency wave packets dominating the turbulent dynamics. However, structures are strikingly different in the near field, where elasticity-driven streaks affect the dynamics in the potential core of the viscoelastic planar jet, modifying the bulk flow and interacting with the flow instability. The analysis of the polymer field reveals stretched polymer filaments and centre-mode structures, which support the implication of the near-field streaks sustaining elastic turbulence in three-dimensional viscoelastic planar jets. [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.2026.11610 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 31 StartPage: 1 Subjects: – SubjectFull: Coherent structures Type: general – SubjectFull: Viscoelastic materials Type: general – SubjectFull: Flow instability Type: general – SubjectFull: Matrix decomposition Type: general – SubjectFull: Viscoelasticity Type: general – SubjectFull: Newtonian fluids Type: general – SubjectFull: Turbulent jets (Fluid dynamics) Type: general – SubjectFull: Turbulence Type: general Titles: – TitleFull: Coherent structures in Newtonian and viscoelastic turbulent planar jets. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Amor, Christian – PersonEntity: Name: NameFull: Corrochano, Adrián – PersonEntity: Name: NameFull: Soligo, Giovanni – PersonEntity: Name: NameFull: Le Clainche, Soledad – PersonEntity: Name: NameFull: Rosti, Marco Edoardo IsPartOfRelationships: – BibEntity: Dates: – D: 10 M: 06 Text: 6/10/2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00221120 Numbering: – Type: volume Value: 1036 Titles: – TitleFull: Journal of Fluid Mechanics Type: main |
| ResultId | 1 |
