On the limits of wavy cylinder wavelength and amplitude for effective wake and vortex-shedding control.
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| Title: | On the limits of wavy cylinder wavelength and amplitude for effective wake and vortex-shedding control. |
|---|---|
| Authors: | New, T. H.1 (AUTHOR), Lim, H. D.2 (AUTHOR), Chen, C. H.3 (AUTHOR), Lua, K. B.3 (AUTHOR) engp4324@nycu.edu.tw |
| Source: | Journal of Marine Science & Technology. Sep2023, Vol. 28 Issue 3, p597-614. 18p. |
| Subjects: | Proper orthogonal decomposition, Wavelengths |
| Abstract: | An experimental time-resolved particle-image velocimetry study was conducted on wavy cylinders possessing wavelength (λ) and amplitude (a) combinations that are significantly different from earlier studies at ReDm = 2700. Results show that vortex formation length increases as the wavelength decreases from λ/Dm = 2.4 to 1.2, but decreases when the latter decreases to λ/Dm = 0.6. Amplitude increments lead to significant vortex formation length growths and reductions at the saddles/nodes of λ/Dm = 2.4 and 1.2 wavy cylinders, respectively. In contrast, λ/Dm = 0.6 wavy cylinders produce significantly shorter vortex formation lengths like a baseline cylinder, regardless of amplitude. Regular reversed flow "lobes" are observed for λ/Dm = 2.4 and 1.2 wavy cylinders, but not λ/Dm = 0.6 ones, which lead to variations in the spanwise vortex formation lengths. Proper orthogonal decomposition (POD) analysis shows that only a/Dm = 0.4, λ/Dm = 0.6 wavy cylinder has the same vortex-shedding frequency as the baseline cylinder. Other POD results also demonstrate that the vortex-shedding behaviour between λ/Dm = 0.6 wavy and baseline cylinder is very similar. The present study shows that there exists a minimal wavelength below which that coherent streamwise vortices will not be produced and wake control benefits of wavy cylinders will be considerably reduced. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Marine Science & Technology is the property of Springer Nature 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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| Header | DbId: egs DbLabel: Engineering Source An: 171101108 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: On the limits of wavy cylinder wavelength and amplitude for effective wake and vortex-shedding control. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22New%2C+T%2E+H%2E%22">New, T. H.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lim%2C+H%2E+D%2E%22">Lim, H. D.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+C%2E+H%2E%22">Chen, C. H.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lua%2C+K%2E+B%2E%22">Lua, K. B.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> engp4324@nycu.edu.tw</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Marine+Science+%26+Technology%22">Journal of Marine Science & Technology</searchLink>. Sep2023, Vol. 28 Issue 3, p597-614. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Proper+orthogonal+decomposition%22">Proper orthogonal decomposition</searchLink><br /><searchLink fieldCode="DE" term="%22Wavelengths%22">Wavelengths</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: An experimental time-resolved particle-image velocimetry study was conducted on wavy cylinders possessing wavelength (λ) and amplitude (a) combinations that are significantly different from earlier studies at ReDm = 2700. Results show that vortex formation length increases as the wavelength decreases from λ/Dm = 2.4 to 1.2, but decreases when the latter decreases to λ/Dm = 0.6. Amplitude increments lead to significant vortex formation length growths and reductions at the saddles/nodes of λ/Dm = 2.4 and 1.2 wavy cylinders, respectively. In contrast, λ/Dm = 0.6 wavy cylinders produce significantly shorter vortex formation lengths like a baseline cylinder, regardless of amplitude. Regular reversed flow "lobes" are observed for λ/Dm = 2.4 and 1.2 wavy cylinders, but not λ/Dm = 0.6 ones, which lead to variations in the spanwise vortex formation lengths. Proper orthogonal decomposition (POD) analysis shows that only a/Dm = 0.4, λ/Dm = 0.6 wavy cylinder has the same vortex-shedding frequency as the baseline cylinder. Other POD results also demonstrate that the vortex-shedding behaviour between λ/Dm = 0.6 wavy and baseline cylinder is very similar. The present study shows that there exists a minimal wavelength below which that coherent streamwise vortices will not be produced and wake control benefits of wavy cylinders will be considerably reduced. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Marine Science & Technology is the property of Springer Nature 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: 10.1007/s00773-023-00943-8 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 597 Subjects: – SubjectFull: Proper orthogonal decomposition Type: general – SubjectFull: Wavelengths Type: general Titles: – TitleFull: On the limits of wavy cylinder wavelength and amplitude for effective wake and vortex-shedding control. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: New, T. H. – PersonEntity: Name: NameFull: Lim, H. D. – PersonEntity: Name: NameFull: Chen, C. H. – PersonEntity: Name: NameFull: Lua, K. B. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 09484280 Numbering: – Type: volume Value: 28 – Type: issue Value: 3 Titles: – TitleFull: Journal of Marine Science & Technology Type: main |
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