DocumentCode
1834656
Title
Notice of Retraction
Computational fluid dynamics in drag reduction of streamline bodies using natural boundary layer transition criterion
Author
Nejati, V. ; Khaleghi, M. ; Kaveh, M.
Author_Institution
Mech. Eng. Dept., Islamic Azad Univ. of Mashhad, Mashhad, Iran
Volume
1
fYear
2010
fDate
1-3 Aug. 2010
Abstract
Notice of Retraction
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
Drag reduction on streamline bodies is attained by extending the laminar flow domain; if the position of the maximum body radius can be located as far aft as possible, it may lead to a favorite pressure gradient in a long distance on the body surface so that the transition occurs farther downstream and the flow stays laminar. In this study the aerodynamics calculation of flow field around the body of revolution is improved to get more accurate drag coefficient. An effective numerical calculation called the Finite Volume Method is considered to solve the laminar and turbulent, axisymmetric boundary layer equations for streamline hulls. For the laminar to turbulent transition locations, the linear stability analysis is applied to predict the natural transition location and to achieve the laminar flow extension. A powerful optimization procedure called Genetic Algorithms (GA) has been combined with the areodynamics calculation to find the optimal shape with minimum drag coefficient. The results were compared with those obtained from integral method and also experimental results and indicate a good agreement. The calculate drag coefficient in this study shows satisfactory agreement with results of Luts and Wagner and also the experimental results. It is concluded that for the purpose of the shape optimization of streamline bodies, the Finite Volume Method which is an accurate aerodynamics calculation method is required. It is also found that the natural transition criterion is an essential approach to indicate the co- rect transition location for various ranges of Reynolds number, and enables us to obtain the body shape with the extended laminar flow.
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
Drag reduction on streamline bodies is attained by extending the laminar flow domain; if the position of the maximum body radius can be located as far aft as possible, it may lead to a favorite pressure gradient in a long distance on the body surface so that the transition occurs farther downstream and the flow stays laminar. In this study the aerodynamics calculation of flow field around the body of revolution is improved to get more accurate drag coefficient. An effective numerical calculation called the Finite Volume Method is considered to solve the laminar and turbulent, axisymmetric boundary layer equations for streamline hulls. For the laminar to turbulent transition locations, the linear stability analysis is applied to predict the natural transition location and to achieve the laminar flow extension. A powerful optimization procedure called Genetic Algorithms (GA) has been combined with the areodynamics calculation to find the optimal shape with minimum drag coefficient. The results were compared with those obtained from integral method and also experimental results and indicate a good agreement. The calculate drag coefficient in this study shows satisfactory agreement with results of Luts and Wagner and also the experimental results. It is concluded that for the purpose of the shape optimization of streamline bodies, the Finite Volume Method which is an accurate aerodynamics calculation method is required. It is also found that the natural transition criterion is an essential approach to indicate the co- rect transition location for various ranges of Reynolds number, and enables us to obtain the body shape with the extended laminar flow.
Keywords
aerodynamics; boundary layer turbulence; computational fluid dynamics; drag reduction; finite volume methods; genetic algorithms; laminar flow; laminar to turbulent transitions; aerodynamics calculation; computational fluid dynamics; drag reduction; finite volume method; genetic algorithms; laminar flow; linear stability analysis; natural boundary layer transition criterion; pressure gradient; streamline bodies; turbulent; Atmospheric modeling; Shape; Drag Reduction; FVM; Natural Transition; Streamline Bodies; component;
fLanguage
English
Publisher
ieee
Conference_Titel
Mechanical and Electronics Engineering (ICMEE), 2010 2nd International Conference on
Conference_Location
Kyoto
Print_ISBN
978-1-4244-7479-0
Type
conf
DOI
10.1109/ICMEE.2010.5558578
Filename
5558578
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