Transition scenario in hypersonic axisymmetrical compression ramp flow.
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| Title: | Transition scenario in hypersonic axisymmetrical compression ramp flow. |
|---|---|
| Authors: | Lugrin, Mathieu1 (AUTHOR) mathieu.lugrin@onera.fr, Beneddine, Samir1 (AUTHOR), Leclercq, Colin1 (AUTHOR), Garnier, Eric1 (AUTHOR), Bur, Reynald1 (AUTHOR) |
| Source: | Journal of Fluid Mechanics. 1/25/2021, Vol. 907, p1-40. 40p. |
| Subjects: | Mach number, Boundary layer (Aerodynamics), Proper orthogonal decomposition, Reynolds number, Thermal instability, Transonic flow |
| Abstract: | A high-fidelity simulation of the shock/transitional boundary layer interaction caused by a $15^\circ$ axisymmetrical compression ramp is performed at a free stream Mach number of 5 and a transitional Reynolds number. The inlet of the computational domain is perturbed with a white noise in order to excite convective instabilities. Coherent structures are extracted using spectral proper orthogonal decomposition (SPOD), which gives a mathematically optimal decomposition of spatio-temporally correlated structures within the flow. The mean flow is used to perform a resolvent analysis in order to study non-normal linear amplification mechanisms. The comparison between the resolvent analysis and the SPOD results provides insight on both the linear and nonlinear mechanisms at play in the flow. To carry out the analysis, the flow is separated into three main regions of interest: the attached boundary layer, the mixing layer and the reattachment region. The observed transition process is dependent on the linear amplification of oblique modes in the boundary layer over a broad range of frequencies. These modes interact nonlinearly to create elongated streamwise structures which are then amplified by a linear mechanism in the rest of the domain until they break down in the reattachment region. The early nonlinear interaction is found to be essential for the transition process. [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: 147715922 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Transition scenario in hypersonic axisymmetrical compression ramp flow. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lugrin%2C+Mathieu%22">Lugrin, Mathieu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mathieu.lugrin@onera.fr</i><br /><searchLink fieldCode="AR" term="%22Beneddine%2C+Samir%22">Beneddine, Samir</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Leclercq%2C+Colin%22">Leclercq, Colin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Garnier%2C+Eric%22">Garnier, Eric</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bur%2C+Reynald%22">Bur, Reynald</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluid+Mechanics%22">Journal of Fluid Mechanics</searchLink>. 1/25/2021, Vol. 907, p1-40. 40p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Mach+number%22">Mach number</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+layer+%28Aerodynamics%29%22">Boundary layer (Aerodynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Proper+orthogonal+decomposition%22">Proper orthogonal decomposition</searchLink><br /><searchLink fieldCode="DE" term="%22Reynolds+number%22">Reynolds number</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+instability%22">Thermal instability</searchLink><br /><searchLink fieldCode="DE" term="%22Transonic+flow%22">Transonic flow</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A high-fidelity simulation of the shock/transitional boundary layer interaction caused by a $15^\circ$ axisymmetrical compression ramp is performed at a free stream Mach number of 5 and a transitional Reynolds number. The inlet of the computational domain is perturbed with a white noise in order to excite convective instabilities. Coherent structures are extracted using spectral proper orthogonal decomposition (SPOD), which gives a mathematically optimal decomposition of spatio-temporally correlated structures within the flow. The mean flow is used to perform a resolvent analysis in order to study non-normal linear amplification mechanisms. The comparison between the resolvent analysis and the SPOD results provides insight on both the linear and nonlinear mechanisms at play in the flow. To carry out the analysis, the flow is separated into three main regions of interest: the attached boundary layer, the mixing layer and the reattachment region. The observed transition process is dependent on the linear amplification of oblique modes in the boundary layer over a broad range of frequencies. These modes interact nonlinearly to create elongated streamwise structures which are then amplified by a linear mechanism in the rest of the domain until they break down in the reattachment region. The early nonlinear interaction is found to be essential for the transition process. [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.2020.833 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 40 StartPage: 1 Subjects: – SubjectFull: Mach number Type: general – SubjectFull: Boundary layer (Aerodynamics) Type: general – SubjectFull: Proper orthogonal decomposition Type: general – SubjectFull: Reynolds number Type: general – SubjectFull: Thermal instability Type: general – SubjectFull: Transonic flow Type: general Titles: – TitleFull: Transition scenario in hypersonic axisymmetrical compression ramp flow. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lugrin, Mathieu – PersonEntity: Name: NameFull: Beneddine, Samir – PersonEntity: Name: NameFull: Leclercq, Colin – PersonEntity: Name: NameFull: Garnier, Eric – PersonEntity: Name: NameFull: Bur, Reynald IsPartOfRelationships: – BibEntity: Dates: – D: 25 M: 01 Text: 1/25/2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 00221120 Numbering: – Type: volume Value: 907 Titles: – TitleFull: Journal of Fluid Mechanics Type: main |
| ResultId | 1 |
