The effect of sweep on laminar separation bubbles
The effect of sweep on laminar separation bubbles
The effect of a systematic variation of the sweep angle on the disturbance amplification and onset of transition is studied in a generic family of swept laminar separation bubbles (LSB) by means of direct numerical simulation. The detailed analysis of a transition scenario with fundamental resonance in a 30°-LSB shows, that the saturation of background disturbances is the key
event, after which a rapid breakdown of transitional structures to smaller scales and thus turbulent flow occurs. The stages of transition are similar to unswept LSB, but two-dimensional disturbances lose their dominance for sweep angles larger than 15°. Instead, oblique Tollmien-Schlichting waves which travel approximately along the direction of the potential streamline
experience the maximal amplification in the linear stage and stimulate the strongest growth of background disturbances after saturation.
laminar separation bubble, sweep angle, transition, direct numerical simulation
395-400
Hetsch, T.
3c399bce-3586-41e1-a93a-846b610c5ea6
Rist, U.
ce1897ad-3be7-4e55-b9db-9114d600f0da
2006
Hetsch, T.
3c399bce-3586-41e1-a93a-846b610c5ea6
Rist, U.
ce1897ad-3be7-4e55-b9db-9114d600f0da
Hetsch, T. and Rist, U.
(2006)
The effect of sweep on laminar separation bubbles.
In,
Govindarajan, R.
(ed.)
Fluid Mechanics and its Applications.
(Proceedings of Sixth IUTAM Symposium on Laminar-Turbulent Transition, 78)
IUTAM Symposium on Laminar-Turbulent Transition (13/12/04 - 17/12/04)
Springer, .
Record type:
Book Section
Abstract
The effect of a systematic variation of the sweep angle on the disturbance amplification and onset of transition is studied in a generic family of swept laminar separation bubbles (LSB) by means of direct numerical simulation. The detailed analysis of a transition scenario with fundamental resonance in a 30°-LSB shows, that the saturation of background disturbances is the key
event, after which a rapid breakdown of transitional structures to smaller scales and thus turbulent flow occurs. The stages of transition are similar to unswept LSB, but two-dimensional disturbances lose their dominance for sweep angles larger than 15°. Instead, oblique Tollmien-Schlichting waves which travel approximately along the direction of the potential streamline
experience the maximal amplification in the linear stage and stimulate the strongest growth of background disturbances after saturation.
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Published date: 2006
Venue - Dates:
IUTAM Symposium on Laminar-Turbulent Transition, Bangalore, India, 2004-12-13 - 2004-12-17
Keywords:
laminar separation bubble, sweep angle, transition, direct numerical simulation
Identifiers
Local EPrints ID: 23717
URI: http://eprints.soton.ac.uk/id/eprint/23717
PURE UUID: 15c846d7-4c14-467d-9377-d765b824e1e6
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Date deposited: 17 Mar 2006
Last modified: 20 Feb 2024 11:13
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Contributors
Author:
T. Hetsch
Author:
U. Rist
Editor:
R. Govindarajan
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