NDLI: On the unsteady motion and stability of a heaving airfoil in ground effect

Content Provider	Springer Nature Link
Author	Molina, Juan Zhang, Xin Angland, David
Copyright Year	2011
Abstract	This study explores the fluid mechanics and force generation capabilities of an inverted heaving airfoil placed close to a moving ground using a URANS solver with the Spalart-Allmaras turbulence model. By varying the mean ground clearance and motion frequency of the airfoil, it was possible to construct a frequency-height diagram of the various forces acting on the airfoil. The ground was found to enhance the downforce and reduce the drag with respect to freestream. The unsteady motion induces hysteresis in the forces’ behaviour. At moderate ground clearance, the hysteresis increases with frequency and the airfoil loses energy to the flow, resulting in a stabilizingmotion. By analogy with a pitching motion, the airfoil stalls in close proximity to the ground. At low frequencies, the motion is unstable and could lead to stall flutter. A stall flutter analysis was undertaken. At higher frequencies, inviscid effects overcome the large separation and the motion becomes stable. Forced trailing edge vortex shedding appears at high frequencies. The shedding mechanism seems to be independent of ground proximity. However, the wake is altered at low heights as a result of an interaction between the vortices and the ground.
Starting Page	164
Ending Page	178
Page Count	15
File Format	PDF
ISSN	05677718
Journal	Acta Mechanica Sinica
Volume Number	27
Issue Number	2
e-ISSN	16143116
Language	English
Publisher	The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences
Publisher Date	2011-04-27
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Oscillating airfoil Flutter Wing in ground effect Vortex shedding Engineering Fluid Dynamics Theoretical and Applied Mechanics Computational Intelligence Classical Continuum Physics
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering Computational Mechanics

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