On the excitation of Görtler vortices by distributed roughness elements
Abstract Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal effects and radial pressure gradients. Depending on various geometrical and flow conditions, these vortices can significantly distort the baseline flow and lead to secondary ins...
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Gespeichert in:
| Autor*in: |
Sescu, Adrian [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015 |
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| Schlagwörter: |
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| Anmerkung: |
© Springer-Verlag Berlin Heidelberg 2015 |
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| Übergeordnetes Werk: |
Enthalten in: Theoretical and computational fluid dynamics - Springer Berlin Heidelberg, 1989, 29(2015), 1-2 vom: 29. Jan., Seite 67-92 |
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| Übergeordnetes Werk: |
volume:29 ; year:2015 ; number:1-2 ; day:29 ; month:01 ; pages:67-92 |
| Links: |
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| DOI / URN: |
10.1007/s00162-015-0340-2 |
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| Katalog-ID: |
OLC2071165667 |
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| 520 | |a Abstract Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal effects and radial pressure gradients. Depending on various geometrical and flow conditions, these vortices can significantly distort the baseline flow and lead to secondary instabilities and ultimately to transition. In this study, the growth of Görtler vortices excited by distributed roughness elements is analyzed using the solution to the nonlinear boundary region equations with upstream boundary conditions derived previously via an asymptotic analysis applied in the vicinity of the roughness elements. Generalized Rayleigh pressure equation derived based on the assumption that the baseline flow is a function of the transverse coordinates only is used to determine the growth rates associated with the secondary instabilities. Within the analysis, the roughness shape, height and diameter as well as the spanwise separation between the roughness elements are varied in the linear regime, while keeping the same Görtler number. It is found that bell-shaped distributed roughness elements are more likely to excite the Görtler instabilities than sharp-edge-type (e.g., cylindrical) roughness elements, and by increasing the roughness diameter, the strength of Görtler vortices associated with the bell-shaped roughness elements increases as expected, but the strength of Görtler vortices associated with cylindrical-shaped roughness elements decreases. | ||
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10.1007/s00162-015-0340-2 doi (DE-627)OLC2071165667 (DE-He213)s00162-015-0340-2-p DE-627 ger DE-627 rakwb eng 530 620 VZ 510 530 VZ Sescu, Adrian verfasserin aut On the excitation of Görtler vortices by distributed roughness elements 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 2015 Abstract Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal effects and radial pressure gradients. Depending on various geometrical and flow conditions, these vortices can significantly distort the baseline flow and lead to secondary instabilities and ultimately to transition. In this study, the growth of Görtler vortices excited by distributed roughness elements is analyzed using the solution to the nonlinear boundary region equations with upstream boundary conditions derived previously via an asymptotic analysis applied in the vicinity of the roughness elements. Generalized Rayleigh pressure equation derived based on the assumption that the baseline flow is a function of the transverse coordinates only is used to determine the growth rates associated with the secondary instabilities. Within the analysis, the roughness shape, height and diameter as well as the spanwise separation between the roughness elements are varied in the linear regime, while keeping the same Görtler number. It is found that bell-shaped distributed roughness elements are more likely to excite the Görtler instabilities than sharp-edge-type (e.g., cylindrical) roughness elements, and by increasing the roughness diameter, the strength of Görtler vortices associated with the bell-shaped roughness elements increases as expected, but the strength of Görtler vortices associated with cylindrical-shaped roughness elements decreases. Boundary layers Gortler vortices Receptivity Thompson, David aut Enthalten in Theoretical and computational fluid dynamics Springer Berlin Heidelberg, 1989 29(2015), 1-2 vom: 29. Jan., Seite 67-92 (DE-627)130799521 (DE-600)1007949-X (DE-576)023042370 0935-4964 nnns volume:29 year:2015 number:1-2 day:29 month:01 pages:67-92 https://doi.org/10.1007/s00162-015-0340-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY SSG-OLC-MAT SSG-OPC-MAT GBV_ILN_20 GBV_ILN_70 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_2088 GBV_ILN_4277 AR 29 2015 1-2 29 01 67-92 |
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10.1007/s00162-015-0340-2 doi (DE-627)OLC2071165667 (DE-He213)s00162-015-0340-2-p DE-627 ger DE-627 rakwb eng 530 620 VZ 510 530 VZ Sescu, Adrian verfasserin aut On the excitation of Görtler vortices by distributed roughness elements 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 2015 Abstract Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal effects and radial pressure gradients. Depending on various geometrical and flow conditions, these vortices can significantly distort the baseline flow and lead to secondary instabilities and ultimately to transition. In this study, the growth of Görtler vortices excited by distributed roughness elements is analyzed using the solution to the nonlinear boundary region equations with upstream boundary conditions derived previously via an asymptotic analysis applied in the vicinity of the roughness elements. Generalized Rayleigh pressure equation derived based on the assumption that the baseline flow is a function of the transverse coordinates only is used to determine the growth rates associated with the secondary instabilities. Within the analysis, the roughness shape, height and diameter as well as the spanwise separation between the roughness elements are varied in the linear regime, while keeping the same Görtler number. It is found that bell-shaped distributed roughness elements are more likely to excite the Görtler instabilities than sharp-edge-type (e.g., cylindrical) roughness elements, and by increasing the roughness diameter, the strength of Görtler vortices associated with the bell-shaped roughness elements increases as expected, but the strength of Görtler vortices associated with cylindrical-shaped roughness elements decreases. Boundary layers Gortler vortices Receptivity Thompson, David aut Enthalten in Theoretical and computational fluid dynamics Springer Berlin Heidelberg, 1989 29(2015), 1-2 vom: 29. Jan., Seite 67-92 (DE-627)130799521 (DE-600)1007949-X (DE-576)023042370 0935-4964 nnns volume:29 year:2015 number:1-2 day:29 month:01 pages:67-92 https://doi.org/10.1007/s00162-015-0340-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY SSG-OLC-MAT SSG-OPC-MAT GBV_ILN_20 GBV_ILN_70 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_2088 GBV_ILN_4277 AR 29 2015 1-2 29 01 67-92 |
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10.1007/s00162-015-0340-2 doi (DE-627)OLC2071165667 (DE-He213)s00162-015-0340-2-p DE-627 ger DE-627 rakwb eng 530 620 VZ 510 530 VZ Sescu, Adrian verfasserin aut On the excitation of Görtler vortices by distributed roughness elements 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 2015 Abstract Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal effects and radial pressure gradients. Depending on various geometrical and flow conditions, these vortices can significantly distort the baseline flow and lead to secondary instabilities and ultimately to transition. In this study, the growth of Görtler vortices excited by distributed roughness elements is analyzed using the solution to the nonlinear boundary region equations with upstream boundary conditions derived previously via an asymptotic analysis applied in the vicinity of the roughness elements. Generalized Rayleigh pressure equation derived based on the assumption that the baseline flow is a function of the transverse coordinates only is used to determine the growth rates associated with the secondary instabilities. Within the analysis, the roughness shape, height and diameter as well as the spanwise separation between the roughness elements are varied in the linear regime, while keeping the same Görtler number. It is found that bell-shaped distributed roughness elements are more likely to excite the Görtler instabilities than sharp-edge-type (e.g., cylindrical) roughness elements, and by increasing the roughness diameter, the strength of Görtler vortices associated with the bell-shaped roughness elements increases as expected, but the strength of Görtler vortices associated with cylindrical-shaped roughness elements decreases. Boundary layers Gortler vortices Receptivity Thompson, David aut Enthalten in Theoretical and computational fluid dynamics Springer Berlin Heidelberg, 1989 29(2015), 1-2 vom: 29. Jan., Seite 67-92 (DE-627)130799521 (DE-600)1007949-X (DE-576)023042370 0935-4964 nnns volume:29 year:2015 number:1-2 day:29 month:01 pages:67-92 https://doi.org/10.1007/s00162-015-0340-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY SSG-OLC-MAT SSG-OPC-MAT GBV_ILN_20 GBV_ILN_70 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_2088 GBV_ILN_4277 AR 29 2015 1-2 29 01 67-92 |
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10.1007/s00162-015-0340-2 doi (DE-627)OLC2071165667 (DE-He213)s00162-015-0340-2-p DE-627 ger DE-627 rakwb eng 530 620 VZ 510 530 VZ Sescu, Adrian verfasserin aut On the excitation of Görtler vortices by distributed roughness elements 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 2015 Abstract Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal effects and radial pressure gradients. Depending on various geometrical and flow conditions, these vortices can significantly distort the baseline flow and lead to secondary instabilities and ultimately to transition. In this study, the growth of Görtler vortices excited by distributed roughness elements is analyzed using the solution to the nonlinear boundary region equations with upstream boundary conditions derived previously via an asymptotic analysis applied in the vicinity of the roughness elements. Generalized Rayleigh pressure equation derived based on the assumption that the baseline flow is a function of the transverse coordinates only is used to determine the growth rates associated with the secondary instabilities. Within the analysis, the roughness shape, height and diameter as well as the spanwise separation between the roughness elements are varied in the linear regime, while keeping the same Görtler number. It is found that bell-shaped distributed roughness elements are more likely to excite the Görtler instabilities than sharp-edge-type (e.g., cylindrical) roughness elements, and by increasing the roughness diameter, the strength of Görtler vortices associated with the bell-shaped roughness elements increases as expected, but the strength of Görtler vortices associated with cylindrical-shaped roughness elements decreases. Boundary layers Gortler vortices Receptivity Thompson, David aut Enthalten in Theoretical and computational fluid dynamics Springer Berlin Heidelberg, 1989 29(2015), 1-2 vom: 29. Jan., Seite 67-92 (DE-627)130799521 (DE-600)1007949-X (DE-576)023042370 0935-4964 nnns volume:29 year:2015 number:1-2 day:29 month:01 pages:67-92 https://doi.org/10.1007/s00162-015-0340-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY SSG-OLC-MAT SSG-OPC-MAT GBV_ILN_20 GBV_ILN_70 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_2088 GBV_ILN_4277 AR 29 2015 1-2 29 01 67-92 |
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10.1007/s00162-015-0340-2 doi (DE-627)OLC2071165667 (DE-He213)s00162-015-0340-2-p DE-627 ger DE-627 rakwb eng 530 620 VZ 510 530 VZ Sescu, Adrian verfasserin aut On the excitation of Görtler vortices by distributed roughness elements 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 2015 Abstract Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal effects and radial pressure gradients. Depending on various geometrical and flow conditions, these vortices can significantly distort the baseline flow and lead to secondary instabilities and ultimately to transition. In this study, the growth of Görtler vortices excited by distributed roughness elements is analyzed using the solution to the nonlinear boundary region equations with upstream boundary conditions derived previously via an asymptotic analysis applied in the vicinity of the roughness elements. Generalized Rayleigh pressure equation derived based on the assumption that the baseline flow is a function of the transverse coordinates only is used to determine the growth rates associated with the secondary instabilities. Within the analysis, the roughness shape, height and diameter as well as the spanwise separation between the roughness elements are varied in the linear regime, while keeping the same Görtler number. It is found that bell-shaped distributed roughness elements are more likely to excite the Görtler instabilities than sharp-edge-type (e.g., cylindrical) roughness elements, and by increasing the roughness diameter, the strength of Görtler vortices associated with the bell-shaped roughness elements increases as expected, but the strength of Görtler vortices associated with cylindrical-shaped roughness elements decreases. Boundary layers Gortler vortices Receptivity Thompson, David aut Enthalten in Theoretical and computational fluid dynamics Springer Berlin Heidelberg, 1989 29(2015), 1-2 vom: 29. Jan., Seite 67-92 (DE-627)130799521 (DE-600)1007949-X (DE-576)023042370 0935-4964 nnns volume:29 year:2015 number:1-2 day:29 month:01 pages:67-92 https://doi.org/10.1007/s00162-015-0340-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY SSG-OLC-MAT SSG-OPC-MAT GBV_ILN_20 GBV_ILN_70 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_2088 GBV_ILN_4277 AR 29 2015 1-2 29 01 67-92 |
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on the excitation of görtler vortices by distributed roughness elements |
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On the excitation of Görtler vortices by distributed roughness elements |
| abstract |
Abstract Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal effects and radial pressure gradients. Depending on various geometrical and flow conditions, these vortices can significantly distort the baseline flow and lead to secondary instabilities and ultimately to transition. In this study, the growth of Görtler vortices excited by distributed roughness elements is analyzed using the solution to the nonlinear boundary region equations with upstream boundary conditions derived previously via an asymptotic analysis applied in the vicinity of the roughness elements. Generalized Rayleigh pressure equation derived based on the assumption that the baseline flow is a function of the transverse coordinates only is used to determine the growth rates associated with the secondary instabilities. Within the analysis, the roughness shape, height and diameter as well as the spanwise separation between the roughness elements are varied in the linear regime, while keeping the same Görtler number. It is found that bell-shaped distributed roughness elements are more likely to excite the Görtler instabilities than sharp-edge-type (e.g., cylindrical) roughness elements, and by increasing the roughness diameter, the strength of Görtler vortices associated with the bell-shaped roughness elements increases as expected, but the strength of Görtler vortices associated with cylindrical-shaped roughness elements decreases. © Springer-Verlag Berlin Heidelberg 2015 |
| abstractGer |
Abstract Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal effects and radial pressure gradients. Depending on various geometrical and flow conditions, these vortices can significantly distort the baseline flow and lead to secondary instabilities and ultimately to transition. In this study, the growth of Görtler vortices excited by distributed roughness elements is analyzed using the solution to the nonlinear boundary region equations with upstream boundary conditions derived previously via an asymptotic analysis applied in the vicinity of the roughness elements. Generalized Rayleigh pressure equation derived based on the assumption that the baseline flow is a function of the transverse coordinates only is used to determine the growth rates associated with the secondary instabilities. Within the analysis, the roughness shape, height and diameter as well as the spanwise separation between the roughness elements are varied in the linear regime, while keeping the same Görtler number. It is found that bell-shaped distributed roughness elements are more likely to excite the Görtler instabilities than sharp-edge-type (e.g., cylindrical) roughness elements, and by increasing the roughness diameter, the strength of Görtler vortices associated with the bell-shaped roughness elements increases as expected, but the strength of Görtler vortices associated with cylindrical-shaped roughness elements decreases. © Springer-Verlag Berlin Heidelberg 2015 |
| abstract_unstemmed |
Abstract Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal effects and radial pressure gradients. Depending on various geometrical and flow conditions, these vortices can significantly distort the baseline flow and lead to secondary instabilities and ultimately to transition. In this study, the growth of Görtler vortices excited by distributed roughness elements is analyzed using the solution to the nonlinear boundary region equations with upstream boundary conditions derived previously via an asymptotic analysis applied in the vicinity of the roughness elements. Generalized Rayleigh pressure equation derived based on the assumption that the baseline flow is a function of the transverse coordinates only is used to determine the growth rates associated with the secondary instabilities. Within the analysis, the roughness shape, height and diameter as well as the spanwise separation between the roughness elements are varied in the linear regime, while keeping the same Görtler number. It is found that bell-shaped distributed roughness elements are more likely to excite the Görtler instabilities than sharp-edge-type (e.g., cylindrical) roughness elements, and by increasing the roughness diameter, the strength of Görtler vortices associated with the bell-shaped roughness elements increases as expected, but the strength of Görtler vortices associated with cylindrical-shaped roughness elements decreases. © Springer-Verlag Berlin Heidelberg 2015 |
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On the excitation of Görtler vortices by distributed roughness elements |
| url |
https://doi.org/10.1007/s00162-015-0340-2 |
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| author2 |
Thompson, David |
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2024-07-04T03:06:20.471Z |
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