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Shape optimization ...
Shape optimization for delay of laminar-turbulent transition
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- Amoignon, Olivier (författare)
- Uppsala universitet,Avdelningen för teknisk databehandling,Numerisk analys,Waves and Fluids
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- Pralits, Jan O. (författare)
- Universita di Salerno, Italy
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- Hanifi, Ardeshir (författare)
- FOI, Swedish Defence Research Agency, Stockholm
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- Berggren, Martin (författare)
- Uppsala universitet,Avdelningen för teknisk databehandling,Numerisk analys,Waves and Fluids
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- Henningson, Dan S. (författare)
- KTH,Stabilitet, Transition, Kontroll,FOI, Swedish Defence Research Agency, Stockholm
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(creator_code:org_t)
- American Institute of Aeronautics and Astronautics (AIAA), 2006
- 2006
- Engelska.
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Ingår i: AIAA Journal. - : American Institute of Aeronautics and Astronautics (AIAA). - 0001-1452 .- 1533-385X. ; 44:5, s. 1009-1024
- Relaterad länk:
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http://www.dicat.uni...
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https://urn.kb.se/re...
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https://doi.org/10.2...
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- A method using gradient-based optimization is introduced for the design of wing profiles with the aim of natural laminar How, as well as minimum wave drag. The Euler equations of gasdynamics, the laminar boundary-layer equations for compressible flows on infinite swept wings, and the linear parabolized stability equations (PSE) are solved to analyze the evolution of convectively unstable disturbances. Laminar-turbulent transition is assumed to be delayed by minimizing a measure of the disturbance kinetic energy of a chosen disturbance, which is computed using the PSE. The shape gradients of the disturbance kinetic energy are computed based on the solutions of the adjoints of the state equations just named. Numerical tests are carried out to optimize the RAE 2822 airfoil with the aim to delay simultaneously the transition, reduce the pressure drag coefficient, and maintain the coefficients of lift and pitch moments. Constraints are also applied on the geometry. Results show a reduction of the total amplification of a large number of disturbances, which is assumed to represent a delay of the transition in the boundary layer. Because delay of the transition implies reduction of the viscous drag, the present method enables shape optimization to perform viscous drag reduction.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Rymd- och flygteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Aerospace Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
- NATURVETENSKAP -- Matematik -- Beräkningsmatematik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Computational Mathematics (hsv//eng)
- NATURVETENSKAP -- Data- och informationsvetenskap -- Datavetenskap (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences -- Computer Sciences (hsv//eng)
Nyckelord
- parabolized stability equations
- disturbance control
- boundary-layers
- steady suction
- design
- flows
- model
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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