Drag reduction of a 3D bluff body using coherent streamwise streaks.
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| Title: | Drag reduction of a 3D bluff body using coherent streamwise streaks. |
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| Authors: | Pujals, G. gregory.pujals@ladhyx.polytechnique.fr, Depardon, S.1, Cossu, C. carlo.cossu@imft.fr |
| Source: | Experiments in Fluids. Nov2010, Vol. 49 Issue 5, p1085-1094. 10p. |
| Subjects: | Particle image velocimetry, Fluid dynamics, Boundary layer control, Vortex generators, Pressure, Shear flow, Laminar flow, Physical measurements |
| Abstract: | Separation on the rear-end of an Ahmed body is suppressed by means of large-scale coherent streaks forced on the roof of the model. These streaks originate from an array of suitably shaped cylindrical roughness elements and are amplified by the mean shear through the lift-up effect. Interacting with the mean velocity field at leading order, they induce a strong controlled spanwise modulation. The resulting streaky base flow is observed to sustain the adverse pressure gradient since PIV measurements as well as static wall pressure distributions show that the re-circulation bubble completely vanishes. These modifications of the topology of the flow are associated with a substantial drag reduction, which can be of about 10% when the roughness array is optimally placed on the roof of the bluff body. [ABSTRACT FROM AUTHOR] |
| Copyright of Experiments in Fluids 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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 54502627 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Drag reduction of a 3D bluff body using coherent streamwise streaks. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Pujals%2C+G%2E%22">Pujals, G.</searchLink><i> gregory.pujals@ladhyx.polytechnique.fr</i><br /><searchLink fieldCode="AR" term="%22Depardon%2C+S%2E%22">Depardon, S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Cossu%2C+C%2E%22">Cossu, C.</searchLink><i> carlo.cossu@imft.fr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Experiments+in+Fluids%22">Experiments in Fluids</searchLink>. Nov2010, Vol. 49 Issue 5, p1085-1094. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Particle+image+velocimetry%22">Particle image velocimetry</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+dynamics%22">Fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+layer+control%22">Boundary layer control</searchLink><br /><searchLink fieldCode="DE" term="%22Vortex+generators%22">Vortex generators</searchLink><br /><searchLink fieldCode="DE" term="%22Pressure%22">Pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+flow%22">Shear flow</searchLink><br /><searchLink fieldCode="DE" term="%22Laminar+flow%22">Laminar flow</searchLink><br /><searchLink fieldCode="DE" term="%22Physical+measurements%22">Physical measurements</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Separation on the rear-end of an Ahmed body is suppressed by means of large-scale coherent streaks forced on the roof of the model. These streaks originate from an array of suitably shaped cylindrical roughness elements and are amplified by the mean shear through the lift-up effect. Interacting with the mean velocity field at leading order, they induce a strong controlled spanwise modulation. The resulting streaky base flow is observed to sustain the adverse pressure gradient since PIV measurements as well as static wall pressure distributions show that the re-circulation bubble completely vanishes. These modifications of the topology of the flow are associated with a substantial drag reduction, which can be of about 10% when the roughness array is optimally placed on the roof of the bluff body. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Experiments in Fluids 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/s00348-010-0857-5 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 1085 Subjects: – SubjectFull: Particle image velocimetry Type: general – SubjectFull: Fluid dynamics Type: general – SubjectFull: Boundary layer control Type: general – SubjectFull: Vortex generators Type: general – SubjectFull: Pressure Type: general – SubjectFull: Shear flow Type: general – SubjectFull: Laminar flow Type: general – SubjectFull: Physical measurements Type: general Titles: – TitleFull: Drag reduction of a 3D bluff body using coherent streamwise streaks. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Pujals, G. – PersonEntity: Name: NameFull: Depardon, S. – PersonEntity: Name: NameFull: Cossu, C. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2010 Type: published Y: 2010 Identifiers: – Type: issn-print Value: 07234864 Numbering: – Type: volume Value: 49 – Type: issue Value: 5 Titles: – TitleFull: Experiments in Fluids Type: main |
| ResultId | 1 |
