Stabilising large-scale motions to enhance passive scalar transport in spanwise rotating plane Poiseuille flows.
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| Title: | Stabilising large-scale motions to enhance passive scalar transport in spanwise rotating plane Poiseuille flows. |
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| Authors: | Guo, Wenlu1 (AUTHOR), Zhang, Shengqi2 (AUTHOR), Li, Yaxing1 (AUTHOR), Xia, Zhenhua1,2 (AUTHOR) xiazh1006@163.com |
| Source: | Journal of Fluid Mechanics. 5/10/2026, Vol. 1034, p1-26. 26p. |
| Subjects: | Coherent structures, Fluid control, Computational fluid dynamics, Shear flow |
| Abstract: | A recent study by Zhang et al. (2024, J. Fluid Mech. , vol. 979, A43) introduced an effective control strategy, namely streamwise-uniform spanwise equally distributed injection/suction slots on the pressure (unstable) wall, to enhance passive scalar transport in spanwise rotating plane Poiseuille flows (RPPFs). In this work, we employ direct numerical simulations to further investigate the scalar transport increase rate ( $\textit{STI}$) under different slot configurations. Two distinct configurations are investigated, namely uniform-width slots, where injection and suction slots share identical dimensions, and non-uniform-width slots, where their widths vary independently. The former is to examine the effect of slot width, whereas the latter is devoted to distinguishing the individual roles of injection versus suction. While the slot widths change, the root mean square wall-normal velocity is maintained at a fixed minimal value. For uniform configurations, $ \textit{STI}$ increases monotonically with slot width, nearly doubling as the width grows from $\pi /8$ to $\pi /2$. In contrast, non-uniform configurations exhibit a complex, non-monotonic dependence on slot dimensions. Spectral, quadrant and zonal-conditional quadrant analyses reveal that injection and suction slots play distinct roles in modulating near-wall dynamics. Injection enhances ejection events ( $Q2$), promoting local plume detachment, and facilitating the formation of large-scale ascending plume currents. Suction, conversely, strengthens sweep events ( $Q4$), suppressing plume detachment while intensifying descending currents. This dual mechanism organises turbulent structures into more stable large-scale structures, thereby improving scalar transport efficiency. A decomposition of $ \textit{STI}$ based on clustering analysis confirms that the enhancement stems primarily from increased occurrence possibilities and improved transport capacities of dominant clusters. These findings establish flow stabilisation through selective slot control as an effective mechanism for enhancing passive scalar transport in RPPFs. [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: 193952168 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Stabilising large-scale motions to enhance passive scalar transport in spanwise rotating plane Poiseuille flows. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Guo%2C+Wenlu%22">Guo, Wenlu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Shengqi%22">Zhang, Shengqi</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Yaxing%22">Li, Yaxing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xia%2C+Zhenhua%22">Xia, Zhenhua</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> xiazh1006@163.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluid+Mechanics%22">Journal of Fluid Mechanics</searchLink>. 5/10/2026, Vol. 1034, p1-26. 26p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Coherent+structures%22">Coherent structures</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+control%22">Fluid control</searchLink><br /><searchLink fieldCode="DE" term="%22Computational+fluid+dynamics%22">Computational fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+flow%22">Shear flow</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A recent study by Zhang et al. (2024, J. Fluid Mech. , vol. 979, A43) introduced an effective control strategy, namely streamwise-uniform spanwise equally distributed injection/suction slots on the pressure (unstable) wall, to enhance passive scalar transport in spanwise rotating plane Poiseuille flows (RPPFs). In this work, we employ direct numerical simulations to further investigate the scalar transport increase rate ( $\textit{STI}$) under different slot configurations. Two distinct configurations are investigated, namely uniform-width slots, where injection and suction slots share identical dimensions, and non-uniform-width slots, where their widths vary independently. The former is to examine the effect of slot width, whereas the latter is devoted to distinguishing the individual roles of injection versus suction. While the slot widths change, the root mean square wall-normal velocity is maintained at a fixed minimal value. For uniform configurations, $ \textit{STI}$ increases monotonically with slot width, nearly doubling as the width grows from $\pi /8$ to $\pi /2$. In contrast, non-uniform configurations exhibit a complex, non-monotonic dependence on slot dimensions. Spectral, quadrant and zonal-conditional quadrant analyses reveal that injection and suction slots play distinct roles in modulating near-wall dynamics. Injection enhances ejection events ( $Q2$), promoting local plume detachment, and facilitating the formation of large-scale ascending plume currents. Suction, conversely, strengthens sweep events ( $Q4$), suppressing plume detachment while intensifying descending currents. This dual mechanism organises turbulent structures into more stable large-scale structures, thereby improving scalar transport efficiency. A decomposition of $ \textit{STI}$ based on clustering analysis confirms that the enhancement stems primarily from increased occurrence possibilities and improved transport capacities of dominant clusters. These findings establish flow stabilisation through selective slot control as an effective mechanism for enhancing passive scalar transport in RPPFs. [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.2026.11486 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 26 StartPage: 1 Subjects: – SubjectFull: Coherent structures Type: general – SubjectFull: Fluid control Type: general – SubjectFull: Computational fluid dynamics Type: general – SubjectFull: Shear flow Type: general Titles: – TitleFull: Stabilising large-scale motions to enhance passive scalar transport in spanwise rotating plane Poiseuille flows. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Guo, Wenlu – PersonEntity: Name: NameFull: Zhang, Shengqi – PersonEntity: Name: NameFull: Li, Yaxing – PersonEntity: Name: NameFull: Xia, Zhenhua IsPartOfRelationships: – BibEntity: Dates: – D: 10 M: 05 Text: 5/10/2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00221120 Numbering: – Type: volume Value: 1034 Titles: – TitleFull: Journal of Fluid Mechanics Type: main |
| ResultId | 1 |
