Aerodynamic study of a circular arc airfoil at low Reynolds numbers using Cartesian mesh CFD

The purpose of the study is to investigate the Reynolds number dependency of a circular arc airfoil at Reynolds numbers from 1×103 to 10×103 by CFD. A block-structured Cartesian-mesh CFD was employed to precisely predict the vortex flowfields in the low Reynolds number region. The calculated aerodyn...

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Bibliographic Details
Published in:Journal of Fluid Science and Technology 2022, Vol.17(3), pp.JFST0007-JFST0007
Main Authors: TAKASE, Takumi, SASAKI, Daisuke, OKAMOTO, Masato
Format: Article
Language:English
Subjects:
Aerodynamic coefficients
Airfoils
Angle of attack
Bubbles
Cartesian coordinates
Cartesian mesh
Circular arc airfoil
Coefficients
Computational fluid dynamics (CFD)
Fluid dynamics
Fluid flow
Laminar separation bubble
Low Reynolds numbers
Reynolds number
Separation
Wind tunnel testing
Wind tunnels
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Summary:The purpose of the study is to investigate the Reynolds number dependency of a circular arc airfoil at Reynolds numbers from 1×103 to 10×103 by CFD. A block-structured Cartesian-mesh CFD was employed to precisely predict the vortex flowfields in the low Reynolds number region. The calculated aerodynamic coefficients were reasonably matched with wind tunnel tests at different Reynolds numbers. The flow goes along upper surface at lower angles of attack, but separation on the upper surface occurs at the trailing edge as the angle of attack increases when the Reynolds number is 1×103. On the other hand, 2D vortices are formed on the upper surface at low angles of attack for Reynolds numbers of 5×103 and 10×103, and then the laminar separation bubbles (long bubbles) are formed as the angle of attacks increases. This causes the nonlinear increase of lift coefficient.
ISSN:1880-5558
1880-5558
DOI:10.1299/jfst.2022jfst0007